Nouveau - Aug 2009 - [Bug 23495] New: nouveau KMS produces no output on a Dell 3008WFP monitor

http://bugs.freedesktop.org/show_bug.cgi?id=23495

           Summary: nouveau KMS produces no output on a Dell 3008WFP monitor
           Product: xorg
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: wil.reichert at gmail.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=28890)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=28890)
dmesg for Dell

Using the kernel from git://anongit.freedesktop.org/nouveau/linux-2.6 produces
no output on a Dell 3008WFP monitor.  Card is a BFG 8800 GTX.  Linux boots
completely but the display remains blank.  Changing the LCD to a Samsung
SyncMaster 213T works fine.


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--- Comment #1 from Wil <wil.reichert at gmail.com>  2009-08-24 18:15:39
PST ---
Created an attachment (id=28891)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=28891)
dmesg for Samsung

dmesg for successful boot on Samsung LCD


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Ben Skeggs <skeggsb at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED




--- Comment #2 from Ben Skeggs <skeggsb at gmail.com>  2009-08-24 20:35:19
PST ---
Ok, this looks like a failure to setup dual-link TMDS which the larger monitor
would require to run at its native resolution.  To solve the immediate problem,
load the nouveau kernel module with "modprobe nouveau duallink=0" to
reject
modes that require more bandwidth than is available on single-link TMDS.  You
won't be running at your monitor's native mode, but you should have an
image.

Now, we don't know exactly how to program dual-link as of yet so if
you're
willing to do some experimentation that'd be *really* good.  Also, grabbing
traces of the NVIDIA binary driver initialising it would help a lot.  See
http://nouveau.freedesktop.org/wiki/MmioTrace for details on how to do this.

For some random testing that may help, try playing with the uscript_tmds module
option.  Valid values for most cards are 0x0001 0x0002 and 0x0105.  0x0001 is
the default, to try the others use "modprobe nouveau
uscript_tmds=0x0105" etc.

Thanks!


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--- Comment #3 from Wil <wil.reichert at gmail.com>  2009-08-24 23:27:54
PST ---
Loading the nouveau module with duallink=0 allowed me to boot into a 1920x1200
framebuffer console.  I reconfigured my system to use the nvidia binary driver
& get an mmiotrace.  Steps I followed:

rmmod'd the nvidia kernel
disabled all but 1 core
echo'd mmiotrace to current_tracer
started the cat on trace_pipe
ran startx & loaded openbox @ 2560x1600
echo'd "X is up" to trace_marker
echo'd nop into current_tracer

trace emailed to mmio dot dumps mentioned on the MmioTraceHowto page


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--- Comment #4 from Ben Skeggs <skeggsb at gmail.com>  2009-08-24 23:56:47
PST ---
Thank you!  Are you able to get me one additional trace by any chance?  Just
after a trace of the binary driver programming a single-link mode too, I have a
theory but want to confirm it first.

Just repeating what you did before, and switching to a lower resolution should
do the trick.

Thanks!


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--- Comment #5 from Wil <wil.reichert at gmail.com>  2009-08-25 00:17:44
PST ---
rmmod'd the nvidia kernel
disabled all but 1 core
echo'd mmiotrace to current_tracer
started the cat on trace_pipe
ran startx & loaded openbox @ 2560x1600
echo'd "X is up" to trace_marker
changed resolution: xrandr --output default --mode 1920x1200
echo'd "resolution changed to 1920x1200" to trace_marker
echo'd nop into current_tracer

Additionally I tried adding uscript_tmds=0x0002 and uscript_tmds=0x0105
parameters to the nouveau modules, both resulted in a blank screen.


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--- Comment #6 from Ben Skeggs <skeggsb at gmail.com>  2009-08-25 00:34:37
PST ---
Oops, the binary driver kept the panel at its native resolution and used the
scalers to scale 1920x1200 up.

Can you add the following to your xorg.conf in the nvidia device section:

Option "FlatPanelProperties" "Scaling = Native"

Also, after the switch to 1920x1200, can you do a switch *back* to the native
resolution.  Sorry for the trouble!


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--- Comment #7 from Wil <wil.reichert at gmail.com>  2009-08-25 07:01:12
PST ---
steps followed:

set nvidia section in xorg.conf to 
  Section "Device"
          Identifier "nouveau"
          Driver "nvidia"
          Option "FlatPanelProperties" "Scaling = Native"
  EndSection

rmmod'd the nvidia kernel
disabled all but 1 core
echo'd mmiotrace to current_tracer
started the cat on trace_pipe
ran startx & loaded openbox @ 2560x1600
echo'd "X is up" to trace_marker
changed resolution: xrandr --output default --mode 1920x1200
echo'd "resolution set to 1920x1200" to trace_marker
changed resolution: xrandr --output default --mode 2560x1600
echo'd "resolution set to 2560x1600" to trace_marker
echo'd nop into current_tracer

dump emailed


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--- Comment #8 from Ben Skeggs <skeggsb at gmail.com>  2009-08-27 23:20:21
PST ---
Thanks for that.  I'm curious, how's latest git?  There probably
won't be any
change, but it doesn't hurt to try :)


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--- Comment #9 from Wil <wil.reichert at gmail.com>  2009-08-29 23:17:16
PST ---
No luck with the latest git, same black screen.


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--- Comment #10 from hedgehog <hedgehogshiatus at gmail.com> 2010-10-29
23:59:49 PDT ---
(In reply to comment #8)
> Thanks for that.  I'm curious, how's latest git?  There probably
won't be any
> change, but it doesn't hurt to try :)
Hi,
I have this Ubuntu bug open against the NVidia driver:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/667683

Lots of sysinfo in that report if any of it helps - Summary: two Quadron FX
3800's.
I wanted to switch to nouveau... but I have this display, so wonder if I can
help resolve this issue?

Best wishes

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |INVALID

--- Comment #11 from Ilia Mirkin <imirkin at alum.mit.edu> ---
It appears that this bug report has laid dormant for quite a while. Sorry we
haven't gotten to it. Since we fix bugs all the time, chances are pretty
good
that your issue has been fixed with the latest software. Please give it a shot.
(Linux kernel 3.10.7, xf86-video-nouveau 1.0.9, mesa 9.1.6, or their git
versions.) If upgrading to the latest isn't an option for you, your
distro's
bugzilla is probably the right destination for your bug report.

In an effort to clean up our bug list, we're pre-emptively closing all bugs
that haven't seen updates since 2011. If the original issue remains, please
make sure to provide fresh info, see http://nouveau.freedesktop.org/wiki/Bugs/
for what we need to see, and re-open this one.

Thanks,

The Nouveau Team

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