Nouveau - Aug 2010 - [Bug 29810] New: Blank screen on nouveau module load

https://bugs.freedesktop.org/show_bug.cgi?id=29810

           Summary: Blank screen on nouveau module load
           Product: xorg
           Version: unspecified
          Platform: PowerPC
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: doi at freemail.hu
         QAContact: xorg-team at lists.x.org


Created an attachment (id=38169)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38169)
lspci output

I have an old CRT eMac with an Nvidia GeForce2 MX card. I try to make it work
with the packaged debian nouveau modules. When the system loads the nouveau
kernel module the screen goes blank. I can log into the computer with ssh and
get the console back with unloading the nouveau module. The X display does not
start at all.

Is there a way to make it work?

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--- Comment #1 from Zoltan Varnagy <doi at freemail.hu> 2010-08-25
23:24:12 PDT ---
Created an attachment (id=38170)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38170)
dmesg output

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--- Comment #2 from Zoltan Varnagy <doi at freemail.hu> 2010-08-25
23:26:01 PDT ---
Created an attachment (id=38171)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38171)
xorg.conf

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--- Comment #3 from Zoltan Varnagy <doi at freemail.hu> 2010-08-25
23:26:26 PDT ---
Created an attachment (id=38172)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38172)
Xorg log

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--- Comment #4 from Zoltan Varnagy <doi at freemail.hu> 2010-08-25
23:28:54 PDT ---
The computer has a CRT display and also a mini vga output on its side which i
don't use.

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--- Comment #5 from Francisco Jerez <currojerez at riseup.net> 2010-08-26
02:22:53 PDT ---
(In reply to comment #0)
> Created an attachment (id=38169)
 -->
(https://bugs.freedesktop.org/attachment.cgi?id=38169)
> lspci output
> 
> I have an old CRT eMac with an Nvidia GeForce2 MX card. I try to make it
work
> with the packaged debian nouveau modules. When the system loads the nouveau
> kernel module the screen goes blank. I can log into the computer with ssh
and
> get the console back with unloading the nouveau module. The X display does
not
> start at all.
> 
> Is there a way to make it work?
A register dump with nouveau unloaded would be useful (using [1], it depends on
libpciaccess).

[1] http://cgit.freedesktop.org/~currojerez/tvdump

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--- Comment #6 from Zoltan Varnagy <doi at freemail.hu> 2010-08-26
05:09:24 PDT ---
Created an attachment (id=38176)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38176)
tvdump output

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--- Comment #7 from Francisco Jerez <currojerez at riseup.net> 2010-08-26
05:31:49 PDT ---
Does it work when you boot with "video=VGA-1:e" in the kernel command
line?

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--- Comment #8 from Zoltan Varnagy <doi at freemail.hu> 2010-08-26
06:36:37 PDT ---
if i use the video=VGA-1:e switch or no switch at all the system starts with
nvidiafb which was not suggested in nouveau wiki. The console comes up, nouveau
and drm module are shown in lsmod but noveau lines do not appear in dmesg. 

If i use video=ofonly or video=ofonly,VGA-1:e the system comes up without
nvidiafb and the screen goes blank when it tries to load nouveau module.

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--- Comment #9 from Francisco Jerez <currojerez at riseup.net> 2010-08-26
07:00:06 PDT ---
(In reply to comment #8)
> if i use the video=VGA-1:e switch or no switch at all the system starts
with
> nvidiafb which was not suggested in nouveau wiki. The console comes up,
nouveau
> and drm module are shown in lsmod but noveau lines do not appear in dmesg. 
> 
> If i use video=ofonly or video=ofonly,VGA-1:e the system comes up without
> nvidiafb and the screen goes blank when it tries to load nouveau module.
Try with "video=nvidiafb:off video=VGA-1:e".

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--- Comment #10 from Zoltan Varnagy <doi at freemail.hu> 2010-08-26
07:34:10 PDT ---
Created an attachment (id=38177)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38177)
second dmesg output

Something seems to happen. I get different messages in dmesg. Although the
screen goes blank again and this time it does not even allow to remove the
nouveau module (module is in use)

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--- Comment #11 from Francisco Jerez <currojerez at riseup.net> 2010-08-26
07:51:21 PDT ---
(In reply to comment #10)
> Created an attachment (id=38177)
 -->
(https://bugs.freedesktop.org/attachment.cgi?id=38177)
> second dmesg output
> 
> Something seems to happen. I get different messages in dmesg. Although the
> screen goes blank again and this time it does not even allow to remove the
> nouveau module (module is in use)
Can you get me another register dump now with nouveau loaded?

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--- Comment #12 from Zoltan Varnagy <doi at freemail.hu> 2010-08-26
07:58:09 PDT ---
Created an attachment (id=38178)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38178)
second tvdump output

Sure. It's a bit different from the last one.

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--- Comment #13 from Marcin Slusarz <marcin.slusarz at gmail.com>
2010-08-26 09:20:14 PDT ---
Last dmesg indicates there's second problem - slightly broken OFfb handover:
"Trying to free nonexistent resource
<0000000098004000-00000000980c3fff>"

I doubt it's the reason of "blank screen", but it should be fixed
anyway.

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--- Comment #14 from Marcin Slusarz <marcin.slusarz at gmail.com>
2010-08-26 09:21:32 PDT ---
Created an attachment (id=38182)
 View: https://bugs.freedesktop.org/attachment.cgi?id=38182
 Review: https://bugs.freedesktop.org/review?bug=29810&attachment=38182

fix for OFfb unload

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--- Comment #15 from Francisco Jerez <currojerez at riseup.net> 2010-08-26
12:08:55 PDT ---
Created an attachment (id=38194)
 View: https://bugs.freedesktop.org/attachment.cgi?id=38194
 Review: https://bugs.freedesktop.org/review?bug=29810&attachment=38194

nv11_emac_kms.patch

(In reply to comment #12)
> Created an attachment (id=38178)
 -->
(https://bugs.freedesktop.org/attachment.cgi?id=38178)
> second tvdump output
> 
> Sure. It's a bit different from the last one.
OK, can you give this patch a try?

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--- Comment #16 from Zoltan Varnagy <doi at freemail.hu> 2010-08-26
21:01:14 PDT ---
Ugh. You mean i should compile a full, at least 2.6.36 kernel with a patched
driver and maybe a complete Xorg as well?

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--- Comment #17 from Francisco Jerez <currojerez at riseup.net> 2010-08-27
04:02:15 PDT ---
(In reply to comment #16)
> Ugh. You mean i should compile a full, at least 2.6.36 kernel with a
patched
> driver and maybe a complete Xorg as well?
Yes, you'll have to build more recent versions of libdrm and
xf86-video-nouveau
if the kernel patch I attached does the trick.

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--- Comment #18 from Zoltan Varnagy <doi at freemail.hu> 2010-09-06
01:19:19 PDT ---
As its a quite old machine that compiling stuff would take many hours so ... i
chose an easier way. I appended your patch to the 2.6.33 kernel nouveau driver,
and recompiled only the driver. Luckily it worked fine. With the given kernel
parameters the new nouveau module loaded fine and i could use the console with
nouveaufb loaded. So i thank for your help. My only problem is now the lack of
X. xorg still says the same error as last time (failed to open device, no
devices detected). Should i open a new bug for that?

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--- Comment #19 from Francisco Jerez <currojerez at riseup.net> 2010-09-06
05:59:54 PDT ---
(In reply to comment #18)
> As its a quite old machine that compiling stuff would take many hours so
... i
> chose an easier way. I appended your patch to the 2.6.33 kernel nouveau
driver,
> and recompiled only the driver. Luckily it worked fine. With the given
kernel
> parameters the new nouveau module loaded fine and i could use the console
with
> nouveaufb loaded. So i thank for your help.
Thanks, to fix this properly I'd be interested in a dump of your OF device
tree, can you send me the output from "tar czvf device-tree.tar.gz
/proc/device-tree/"?
> My only problem is now the lack of
> X. xorg still says the same error as last time (failed to open device, no
> devices detected). Should i open a new bug for that?
Please, read the trouble shooting guide [1] carefully before opening a new bug.

[1] http://nouveau.freedesktop.org/wiki/TroubleShooting

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--- Comment #20 from Zoltan Varnagy <doi at freemail.hu> 2010-09-06
07:34:58 PDT ---
Created an attachment (id=38476)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38476)
device tree archive

Here you are. Okay i read through the Troubleshoot guide and think over the
next step.

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--- Comment #21 from Francisco Jerez <currojerez at riseup.net> 2010-09-06
08:23:08 PDT ---
Created an attachment (id=38477)
 View: https://bugs.freedesktop.org/attachment.cgi?id=38477
 Review: https://bugs.freedesktop.org/review?bug=29810&attachment=38477

nv11_emac_kms_2.patch

(In reply to comment #20)
> Created an attachment (id=38476)
 -->
(https://bugs.freedesktop.org/attachment.cgi?id=38476)
> device tree archive
> 
> Here you are. Okay i read through the Troubleshoot guide and think over the
> next step.
Thanks, can you try this patch instead of the last one and tell me how it goes?

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--- Comment #22 from Zoltan Varnagy <doi at freemail.hu> 2010-09-07
05:52:44 PDT ---
Well it went worse. This time the screen remains blank and the nouveau module
is loaded. So i think i will stay at the previous solution. 

Finally i compiled and tried the 2.6.36 kernel and the DDX driver and managed
to start X with nouveau. Although it seems to be slower than the nv driver.
glxgears dropped to 50 from 150, it uses software rendering for opengl and hung
the machine on video load. I wonder if these can get better.

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--- Comment #23 from Francisco Jerez <currojerez at riseup.net> 2010-09-07
06:12:53 PDT ---
(In reply to comment #22)
> Well it went worse. This time the screen remains blank and the nouveau
module
> is loaded. So i think i will stay at the previous solution. 
> 
Did you have "video=VGA-1:e" in your kernel command line? If you did
please try
without.
> Finally i compiled and tried the 2.6.36 kernel and the DDX driver and
managed
> to start X with nouveau.
Where did you get that kernel from? The nouveau kernel tree or Linus' tree?
> Although it seems to be slower than the nv driver.
> glxgears dropped to 50 from 150, it uses software rendering for opengl and
hung
> the machine on video load. I wonder if these can get better.
It uses software rendering because you haven't installed the 3D driver (try
it
at your own risk, it's still unsupported).

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--- Comment #24 from Zoltan Varnagy <doi at freemail.hu> 2010-09-07
06:40:37 PDT ---
(In reply to comment #23)
> (In reply to comment #22)
> > Well it went worse. This time the screen remains blank and the nouveau
module
> > is loaded. So i think i will stay at the previous solution. 
> > 
> Did you have "video=VGA-1:e" in your kernel command line? If you
did please try
> without.
I tried without that as well but it still shows black screen. Should i post a
register dump? 
> > Finally i compiled and tried the 2.6.36 kernel and the DDX driver and
managed
> > to start X with nouveau.
> 
> Where did you get that kernel from? The nouveau kernel tree or Linus'
tree?
I did it with git as written at 
http://nouveau.freedesktop.org/wiki/DebianInstall
The only thing i have not compiled was libdrm as the debian 2.4.21 version
seemed new enough. 
> > Although it seems to be slower than the nv driver.
> > glxgears dropped to 50 from 150, it uses software rendering for opengl
and hung
> > the machine on video load. I wonder if these can get better.
> It uses software rendering because you haven't installed the 3D driver
(try it
> at your own risk, it's still unsupported).
Hmm, okay, thanks maybe later. Actually i just expected some speedup on xmoto
which does not use 3d as far as i know. I thought it would be faster as fast 2D
seems to be present in the nouveau feature matrix at NV10.

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--- Comment #25 from Francisco Jerez <currojerez at riseup.net> 2010-09-07
07:29:57 PDT ---
Created an attachment (id=38515)
 View: https://bugs.freedesktop.org/attachment.cgi?id=38515
 Review: https://bugs.freedesktop.org/review?bug=29810&attachment=38515

nouveau_edid_from_of.patch

(In reply to comment #24)
> (In reply to comment #23)
> > (In reply to comment #22)
> > > Well it went worse. This time the screen remains blank and the
nouveau module
> > > is loaded. So i think i will stay at the previous solution. 
> > > 
> > Did you have "video=VGA-1:e" in your kernel command line? If
you did please try
> > without.
> 
> I tried without that as well but it still shows black screen. Should i post
a
> register dump? 
> 
Sigh... so it seems OF is the only way to get an EDID for your monitor, new
patch attached, try it *without* "video=VGA-1:e".
> [...]
> > > Although it seems to be slower than the nv driver.
> > > glxgears dropped to 50 from 150, it uses software rendering for
opengl and hung
> > > the machine on video load. I wonder if these can get better.
> > It uses software rendering because you haven't installed the 3D
driver (try it
> > at your own risk, it's still unsupported).
> 
> Hmm, okay, thanks maybe later. Actually i just expected some speedup on
xmoto
> which does not use 3d as far as i know. I thought it would be faster as
fast 2D
> seems to be present in the nouveau feature matrix at NV10.
Xmoto uses OpenGL to draw itself, so yes, it's 3d. And by the way, your card
needs the classic mesa drivers instead of gallium, to build them pass
"--with-dri-drivers=nouveau" instead of
"--enable-gallium-nouveau" to the mesa
configure script.

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--- Comment #26 from Zoltan Varnagy <doi at freemail.hu> 2010-09-07
08:58:39 PDT ---
(In reply to comment #25)
> Sigh... so it seems OF is the only way to get an EDID for your monitor, new
> patch attached, try it *without* "video=VGA-1:e".
I am not sure i am doing the thing you thought about. I appended your third
patch to the second and got black screen again. Should i have used only the
third? I try these with the 2.6.33 kernel. I hope its not a problem (it went
fine with it with your first patch). 
> > seems to be present in the nouveau feature matrix at NV10.
> 
> Xmoto uses OpenGL to draw itself, so yes, it's 3d. And by the way, your
card
> needs the classic mesa drivers instead of gallium, to build them pass
> "--with-dri-drivers=nouveau" instead of
"--enable-gallium-nouveau" to the mesa
> configure script.
Well ... that means i should compile mesa as well? Check out from git not only
the mesa/drm part as written on the page but the whole mesa branch and compile
somehow? I feel like it would be really great to have a Makefile somewhere
which does all this checkout/compile/package/install stuff. The Xorg log says
something about nouveau_vieux_dri.so. The mesa compiling would produce that?

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--- Comment #27 from Francisco Jerez <currojerez at riseup.net> 2010-09-07
09:11:11 PDT ---
(In reply to comment #26)
> (In reply to comment #25)
> > Sigh... so it seems OF is the only way to get an EDID for your
monitor, new
> > patch attached, try it *without* "video=VGA-1:e".
> 
> I am not sure i am doing the thing you thought about. I appended your third
> patch to the second and got black screen again. Should i have used only the
> third? I try these with the 2.6.33 kernel. I hope its not a problem (it
went
> fine with it with your first patch). 
> 
Yes, try with the last patch alone, and provide full kernel logs if it
doesn't
work.
> > > seems to be present in the nouveau feature matrix at NV10.
> > 
> > Xmoto uses OpenGL to draw itself, so yes, it's 3d. And by the way,
your card
> > needs the classic mesa drivers instead of gallium, to build them pass
> > "--with-dri-drivers=nouveau" instead of
"--enable-gallium-nouveau" to the mesa
> > configure script.
> 
> Well ... that means i should compile mesa as well? Check out from git not
only
> the mesa/drm part as written on the page but the whole mesa branch and
compile
> somehow?
You just have to clone the mesa repository, as described here [1].
> I feel like it would be really great to have a Makefile somewhere
> which does all this checkout/compile/package/install stuff. The Xorg log
says
> something about nouveau_vieux_dri.so. The mesa compiling would produce
that?
Yup.

[1] http://nouveau.freedesktop.org/wiki/GalliumHowto

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--- Comment #28 from Zoltan Varnagy <doi at freemail.hu> 2010-09-07
11:37:47 PDT ---
Created an attachment (id=38526)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38526)
fourth dmesg output

Unfortunately the same thing happened with the last patch. I hope you meant
this by detailed kernel log.

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--- Comment #29 from Zoltan Varnagy <doi at freemail.hu> 2010-09-07
11:40:54 PDT ---
Okay anyone read comment #22 just forget it. NOUVEAU IS BETTER THAN nv. After
compiling the mesa driver and using it xmoto went fine and smooth. Its also
possible to run some 3d games. Thanks for your help again.

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--- Comment #30 from Francisco Jerez <currojerez at riseup.net> 2010-09-07
12:20:27 PDT ---
(In reply to comment #28)
> Created an attachment (id=38526)
 -->
(https://bugs.freedesktop.org/attachment.cgi?id=38526)
> fourth dmesg output
> 
> Unfortunately the same thing happened with the last patch. I hope you meant
> this by detailed kernel log.
Are you sure you reverted the previous patches before trying this one? They
aren't supposed to work together.

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--- Comment #31 from walt <w41ter at gmail.com> 2010-09-07 16:09:14 PDT
---
(In reply to comment #29)
> After
> compiling the mesa driver and using it xmoto went fine and smooth. Its also
> possible to run some 3d games.
This is a long and complicated bug report, so I'd be grateful for a brief
summary of the steps you took to get everything working.  In particular, which
git repos did you actually need?

You mention 3d also.  Did you use the --enable-gallium-nouveau config flag or
the other one mentioned by Francisco?

I'm confused about the need for gallium to run 3d software -- I read
somewhere
that it's needed for 3d support, but Francisco told you to use the other
flag.

Thanks!

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--- Comment #32 from Zoltan Varnagy <doi at freemail.hu> 2010-09-07
20:38:55 PDT ---
(In reply to comment #30)
> (In reply to comment #28)
> > Created an attachment (id=38526)
 -->
(https://bugs.freedesktop.org/attachment.cgi?id=38526)
> > fourth dmesg output
> > 
> > Unfortunately the same thing happened with the last patch. I hope you
meant
> > this by detailed kernel log.
> 
> Are you sure you reverted the previous patches before trying this one? They
> aren't supposed to work together.
Well i have just checked. All .c files in drivers/gpu/drm/nouveau have
modification date feb.24 only the nouveau_connector.c is sept 7. The module is
recompiled and put into the /lib directory. I really don't know about this
driver details but the fact is it worked when i only applied your first
nv04_crtc.c suggestions.

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--- Comment #33 from Zoltan Varnagy <doi at freemail.hu> 2010-09-07
20:54:33 PDT ---
(In reply to comment #31)
> (In reply to comment #29)
> This is a long and complicated bug report, so I'd be grateful for a
brief
> summary of the steps you took to get everything working.  In particular,
which
> git repos did you actually need?
Well the way it worked is very close to one written at 
http://nouveau.freedesktop.org/wiki/DebianInstall
In the large frame. Roughly it was:
a) I checked out the nouveau kernel and applied the patch given in comment #15
. I compiled and installed the new kernel.
b) instead of compiling libdrm i used the debian packaged one (2.4.21)
c) i also checked out the mesa driver
git://anongit.freedesktop.org/git/mesa/mesa
configured with 
./configure --enable-debug --enable-glx-tls --disable-asm
--with-dri-drivers=nouveau --disable-gallium-i915 --disable-gallium-i965
--disable-gallium-radeon --disable-gallium-r600 --disable-gallium-svga
--with-state-trackers=glx,dri
and put the resulting lib/nouveau_vieux_dri.so to /usr/lib/dri
d) Checked out the ddx and installed as written
> I'm confused about the need for gallium to run 3d software -- I read
somewhere
> that it's needed for 3d support, but Francisco told you to use the
other flag.
Yes as far as i know for this card the nouveau_vieux_dri driver is needed
instead, which was created in step c)
> Thanks!
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--- Comment #34 from Francisco Jerez <currojerez at riseup.net> 2010-09-08
07:43:35 PDT ---
Created an attachment (id=38552)
 View: https://bugs.freedesktop.org/attachment.cgi?id=38552
 Review: https://bugs.freedesktop.org/review?bug=29810&attachment=38552

nouveau_edid_from_of_dbg.patch

(In reply to comment #32)
> (In reply to comment #30)
> > (In reply to comment #28)
> > > Created an attachment (id=38526)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38526)
[details]
> > > fourth dmesg output
> > > 
> > > Unfortunately the same thing happened with the last patch. I hope
you meant
> > > this by detailed kernel log.
> > 
> > Are you sure you reverted the previous patches before trying this one?
They
> > aren't supposed to work together.
> 
> Well i have just checked. All .c files in drivers/gpu/drm/nouveau have
> modification date feb.24 only the nouveau_connector.c is sept 7. The module
is
> recompiled and put into the /lib directory. I really don't know about
this
> driver details but the fact is it worked when i only applied your first
> nv04_crtc.c suggestions.
Not sure what's going on then, can you show me the kernel logs you get after
running it with this patch applied and the previous ones reverted?

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--- Comment #35 from Zoltan Varnagy <doi at freemail.hu> 2010-09-08
12:02:18 PDT ---
Created an attachment (id=38563)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38563)
fifth demsg output

Here you are. Debian kernel, video=nvidiafb:off argument. Your last patch only.

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--- Comment #36 from Francisco Jerez <currojerez at riseup.net> 2010-09-08
12:22:28 PDT ---
(In reply to comment #35)
> Created an attachment (id=38563)
 -->
(https://bugs.freedesktop.org/attachment.cgi?id=38563)
> fifth demsg output
> 
> Here you are. Debian kernel, video=nvidiafb:off argument. Your last patch
only.
> [   15.741618] 216: NVDA,Display-A NVDA,Display-A c27813bc 0 1
                                                              ^^^

Man, that definitely means you have "nv11_emac_kms_2.patch" applied,
try "git
reset --hard" to get a clean tree before going forward.

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--- Comment #37 from Zoltan Varnagy <doi at freemail.hu> 2010-09-08
21:53:39 PDT ---
(In reply to comment #36)
> (In reply to comment #35)
> > Created an attachment (id=38563)
 -->
(https://bugs.freedesktop.org/attachment.cgi?id=38563)
> > fifth demsg output
> > 
> > Here you are. Debian kernel, video=nvidiafb:off argument. Your last
patch only.
> 
> > [   15.741618] 216: NVDA,Display-A NVDA,Display-A c27813bc 0 1
>                                                               ^^^
> 
> Man, that definitely means you have "nv11_emac_kms_2.patch"
applied, try "git
> reset --hard" to get a clean tree before going forward.
Hmm yes, something close to that, sorry. I reverted the patch by copying back
the older nv04_crtc.c file and as it was older than the nv04_crtc.o the
compiler did not recompile the object file. I did it again and the system
started fine. It chose some funny 158x60 text mode on nouveau module load with
tiny letters. 

So the configuration is which was intended last time. Debian experimental
kernel, video=nvidiafb:off argument. Your last patch only.

Do you need any kernel or register dumps?

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Francisco Jerez <currojerez at riseup.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #38 from Francisco Jerez <currojerez at riseup.net> 2010-09-09
05:44:53 PDT ---
(In reply to comment #37)
> (In reply to comment #36)
> > (In reply to comment #35)
> > > Created an attachment (id=38563)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38563)
[details]
> > > fifth demsg output
> > > 
> > > Here you are. Debian kernel, video=nvidiafb:off argument. Your
last patch only.
> > 
> > > [   15.741618] 216: NVDA,Display-A NVDA,Display-A c27813bc 0 1
> >                                                               ^^^
> > 
> > Man, that definitely means you have "nv11_emac_kms_2.patch"
applied, try "git
> > reset --hard" to get a clean tree before going forward.
> 
> Hmm yes, something close to that, sorry. I reverted the patch by copying
back
> the older nv04_crtc.c file and as it was older than the nv04_crtc.o the
> compiler did not recompile the object file. I did it again and the system
> started fine. It chose some funny 158x60 text mode on nouveau module load
with
> tiny letters. 
> 
> So the configuration is which was intended last time. Debian experimental
> kernel, video=nvidiafb:off argument. Your last patch only.
> 
> Do you need any kernel or register dumps?
No, thanks, I've pushed the fix to master. Feel free to open a new bug about
the video crash you said you are seeing.

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