Nouveau - Jul 2009 - [Bug 22956] New: nv50: kms, random screen blinkage

http://bugs.freedesktop.org/show_bug.cgi?id=22956

           Summary: nv50: kms, random screen blinkage
           Product: xorg
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: kamilkss at gmail.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=28020)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=28020)
dmesg

when kms is off everything is fine, but with kms on screen seems to blink
randomly from time time whether I'm in shell~tty1 or when X is running. it
almost seems like a crtc timing issue. along with the screen blink there's
one
horizontal bar/artifact at the same level as the cursor, both true for
shell~tty1 and xorg~gui. also upon entering xorg~gui I noticed fuzzy fonts as
if vert refresh rate was off but it was at 60Hz which happens to the max of my
lcd.


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--- Comment #1 from Kamil Kaminski <kamilkss at gmail.com>  2009-07-26
20:34:42 PST ---
Created an attachment (id=28021)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=28021)
gt200 vbios


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--- Comment #2 from Kamil Kaminski <kamilkss at gmail.com>  2009-07-26
20:37:09 PST ---
Created an attachment (id=28022)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=28022)
Xorg.0 no go with exapixmaps, since when it is not working? :p


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--- Comment #3 from Kamil Kaminski <kamilkss at gmail.com>  2009-07-26
20:39:43 PST ---
Created an attachment (id=28023)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=28023)
kernel log with xorg and ddx up, beware~7.4MB


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Kamil Kaminski <kamilkss at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #28020|application/octet-stream    |text/plain
          mime type|                            |




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--- Comment #4 from Maarten Maathuis <madman2003 at gmail.com>  2009-07-27
13:21:24 PST ---
Something strange happened which is preventing tiled frontbuffers working on
NVA0 gpus, darktama is aware of it, but no solution has been found by him.

The reason for the fuzzy image i do not know.


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--- Comment #5 from Kamil Kaminski <kamilkss at gmail.com>  2009-07-28
23:47:32 PST ---
I narrowed down the 'blinkage' issue to commit "drm/nouveau: allow
entire
0x0002xxxx range in VBIOS parser on >=nv50",
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?id=66125505c3ac0e201e8286c777be46f3b415ff53,
this is what makes my NVA0 go crazy. I'm really happy that it all went well,
my
first time git bisecting anything...For each nouveau.ko that I build I had to
hexedit the vermagic section/symbol to be able to insert the module into the
current running kernel since vergmagic was always different after every compile
(and I had to end with same filesize otherwise it wouldn't load!?). Is there
a
better way to do it? From what I read there's other way to do, e.g. strip
.modinfo symbol but this never worked for me (objcopy -N .modinfo mod.ko
mod-stripped.ko)

stillunknown, AFAIK the fuzzy screen was a result of blinkage. Also the
exapixmaps/tiles work for me now. There was at least 1 other person on the IRC
that described similar blinking issue, I will try to make a video of what I was
experiencing ;).


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--- Comment #6 from Kamil Kaminski <kamilkss at gmail.com>  2009-07-29
00:58:30 PST ---
Here's what was happening, next time I will need to use Windows(TM) to
record
and be able to set my webcam to 30fps instead of 5fps :(.

http://www.youtube.com/watch?v=TlqSOv8UyQg


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--- Comment #7 from Ben Skeggs <skeggsb at gmail.com>  2009-07-29 02:50:57
PST ---
Are you 100% certain that's the commit?  Unless you're resuming from
suspend,
that code should have no effect, unless simply reading from one of the regs in
your VBIOS scripts causes it..


I'd be curious for logs of "modprobe drm debug=1; modprobe nouveau
modeset=1"
both with and without that commit.

Thanks!


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--- Comment #8 from Kamil Kaminski <kamilkss at gmail.com>  2009-07-29
04:27:27 PST ---
Created an attachment (id=28153)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=28153)
good,
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?id=7992783bc72309bf4e1323097078406c4588adec


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--- Comment #9 from Kamil Kaminski <kamilkss at gmail.com>  2009-07-29
04:28:04 PST ---
Created an attachment (id=28154)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=28154)
bad,
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?id=66125505c3ac0e201e8286c777be46f3b415ff53


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--- Comment #10 from Kamil Kaminski <kamilkss at gmail.com>  2009-07-29
04:30:31 PST ---
"drm/nouveau: implement init table opcode 0x97"
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?id=7992783bc72309bf4e1323097078406c4588adec
is the newest commit that works

starting from "drm/nouveau: allow entire 0x0002xxxx range in VBIOS parser
on
>=nv50" I get blinking screen, I confirmed it with "drm/nv50: fix
bogus warning
when running analog output scripts" which happens to be a one liner.

For each module I did a cold-boot.


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--- Comment #11 from Kamil Kaminski <kamilkss at gmail.com>  2009-07-30
14:12:58 PST ---
I noticed something interesting with 0x00020074 register, if you look at the
logs, when this register is omitted/tagged as unknown everything works fine.
Currently with git code this is what's happening:

nouveau 0000:01:00.0:   Write: Reg: 0x00020074, Data: 0x80000000

while the mmiotrace from 190.18 blob shows this:

R 4 222.638450 3 0xfa020074 0x90000000 0x0 0
W 4 222.638466 3 0xfa020074 0x90010000 0x0 0
...
R 4 222.638579 3 0xfa020074 0x90010000 0x0 0
W 4 222.638594 3 0xfa020074 0x90010000 0x0 0

notice that blob writes 0x90010000 to that registers, do we know what this
register does?





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Kamil Kaminski <kamilkss at gmail.com> changed:

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




--- Comment #12 from Kamil Kaminski <kamilkss at gmail.com>  2009-07-30
18:21:17 PST ---
fixed! thanks darktama
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?id=9709e636a5ca3d3116da3ab279d5420e2700cad8


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