Bug 55294

Summary:	Running EGL demos on DRM from mesa-demos causes a corrupted output on NV50
Product:	Mesa	Reporter:	Lubosz Sarnecki <lubosz>
Component:	Drivers/DRI/nouveau	Assignee:	Nouveau Project <nouveau>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium
Version:	git
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Attachments:	kernel log with nouveau.reg_debug=0x600 Photograph of corrupted output demo log with verbose egl flags fix fix v2

Description Lubosz Sarnecki 2012-09-24 21:39:02 UTC

Created attachment 67649 [details]
kernel log with nouveau.reg_debug=0x600

When I try to run the mesa demos on the EGL/DRM backend I get a corrupted screen. 

You can find the demos here: http://cgit.freedesktop.org/mesa/demos/tree/src/egl/opengl

The binaries for the EGL/DRM backend have a "_screen" suffix.
The demos are using eglut with the eglut_screen/drm backend.

The following kernel errors are printed:
[drm] nouveau 0000:01:00.0: EvoCh 0 Mthd 0x086c Data 0x00005564 (0x0084 0x04)
[drm] nouveau 0000:01:00.0: EvoCh 1 Mthd 0x080c Data 0x00005564 (0x0084 0x04)

You can find a screenshot and an kernel log with the "nouveau.reg_debug=0x600" flag in the attachment.

Kernel 3.6.0 RC5 on NV50.

A similar kernel error can be found in this bug:
https://bugs.freedesktop.org/show_bug.cgi?id=27483

Comment 1 Lubosz Sarnecki 2012-09-24 21:39:52 UTC

Created attachment 67650 [details]
Photograph of corrupted output

Comment 2 Lubosz Sarnecki 2012-09-25 20:50:15 UTC

joi on the irc figured out that it has to do with the resolution I am trying to set (1366 x 768).

With his patch on the demos http://bpaste.net/show/47560/ I was able to set a 1280 x 768 resolution successfully.

Comment 3 Lubosz Sarnecki 2012-09-25 20:51:08 UTC

Created attachment 67694 [details]
demo log with verbose egl flags

Comment 4 Marcin Slusarz 2012-09-29 01:19:19 UTC

Created attachment 67841 [details] [review]
fix

This patch should do the trick.

Comment 5 Lubosz Sarnecki 2012-09-29 13:20:19 UTC

Thank you very much for the patch. With the patched mesa I could successfully run the eglut demos with my native resolution on linux 3.6.0 rc7.

Should this be a mesa / gallium bug then?

Comment 6 Marcin Slusarz 2012-10-02 00:14:37 UTC

Created attachment 67956 [details] [review]
fix v2

Yes. This is Mesa-side bug. I've changed product/component.

After closer look, I came to a conclusion that my patch was not quite correct. Please test the new one (although I managed to reproduced this issue and both patches fix it).

Comment 7 Emil Velikov 2012-10-10 13:18:35 UTC

The patch has been pushed upstream
master 93eba269351c6e256db3a4cc7c7018f5a3fae5a1

Please reopen if the issue persist

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