Bug 34469

Summary: libdrm modetest fails, and causes kernel panic
Product: Mesa Reporter: Darxus <darxus>
Component: Drivers/DRI/nouveauAssignee: Nouveau Project <nouveau>
Status: RESOLVED FIXED QA Contact:
Severity: normal    
Priority: medium CC: darxus
Version: git   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:
Attachments: Kernel panic

Description Darxus 2011-02-18 18:51:07 UTC 
The modetest program with -v argument should flip back and forth between a color test pattern and a solid grey screen.  Running just "./modetest" said I was running 1600x1200 @75hz.  I ran "./modetest -s 7:1600x1200 -v" and "./modetest -s 7:640x480 -v", both gave me a lot of garbage.  I ran "./modetest -s 7:1600x1200@75 -v", and got an almost steady display alternating vertically between bars of the color pattern and the solid grey.  Very roughly 20 rows of pixels each.

Later I ran just "./modetest -s 7:1600x1200@75" and got a kernel panic.  I got a photo, but I need to find my CF reader.  It included:
...RIP... nouveau_finish_page_flip+0xae/0x1a0 [nouveau]

I was using an NV50 family card, G92 [GeForce 8800 GT].

I believe this is related to the corruption I'm occasionally seeing in wayland's DRM output.

Built kernel from nouveau kernel repo, last commit:
commit 82eeca9a994c9676e3ab478285d02b9474d70cba
CommitDate: Thu Feb 17 11:11:28 2011 +1000

libdrm freshly rebuilt from git:
commit a697fb6acad7992c3d23bb6a663663694782eb7b
CommitDate: Thu Feb 17 20:40:30 2011 +0100
Comment 1 Darxus 2011-02-18 19:27:03 UTC 
Created attachment 43543 [details]
Kernel panic

Original is higher resolution if there's anything you can't read in this.
Comment 2 Ben Skeggs 2011-02-19 00:54:40 UTC 
The very next commit in the tree (8e645575d469bf08c9d5d98a101ef4cfce6a9180 "drm/nouveau: Fix pageflip event") has a fix related to page flipping, could you please try it.
Comment 3 Darxus 2011-02-19 08:39:57 UTC 
Sorry I failed to mention, I had applied that "drm/nouveau: Fix pageflip event" patch manually, before it was committed.  Without it the screen never update in wayland (DRM), staying frozen on the first frame.  I expect modetest would have done the same.
Comment 4 Darxus 2012-04-09 10:47:36 UTC 
This was apparently fixed at some point before Ubuntu kernel 3.0.0-17-generic was packaged.  Any idea which commit it was?

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