Bug 5902

Summary: i915: ppracer fails with DRM_I830_CMDBUFFER: -22
Product: DRI Reporter: Bernhard Rosenkraenzer <bero>
Component: DRM/otherAssignee: Default DRI bug account <dri-devel>
Status: CLOSED FIXED QA Contact:
Severity: normal    
Priority: high    
Version: DRI git   
Hardware: Other   
OS: other   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
Add extra error debugging none

Description Bernhard Rosenkraenzer 2006-02-16 15:07:24 UTC 
Finally got i915 DRI to work with current CVS stuff -- most applications are 
running fine and with 3D acceleration now, even complicated stuff like nexuiz 
works.

However, ppracer (tuxracer fork - http://projects.planetpenguin.de/racer/) 
crashes on startup, saying

DRM_I830_CMDBUFFER: -22
Comment 1 Alan Hourihane 2006-02-16 16:01:46 UTC 
what does 'dmesg' say ?
Comment 2 Bernhard Rosenkraenzer 2006-02-16 23:27:17 UTC 
[drm:i915_cmdbffer] *ERROR* i915_dispatch_cmdbuffer failed
Comment 3 Alan Hourihane 2006-02-17 16:18:47 UTC 
Created attachment 4641 [details] [review]
Add extra error debugging

Can you recompile the DRM CVS with this patch so that it has some extra
information via 'dmesg' to determine the problem area.
Comment 4 Eric Anholt 2006-02-17 19:02:25 UTC 
On my i945G, I get the same error with ppracer, and also the Mesa "reflect" demo
(though glxgears, and foobillard (modulo a hang) worked).  With similar
debugging, not as complete, "too many dwords" wasn't hit but validate_cmd failed
with sz=0.

Code was modular as of ~1 week ago (since xf86-video-i810 is currently broken),
fresh Mesa CVS and DRM CVS.
Comment 5 Alan Hourihane 2006-02-18 04:08:24 UTC 
Fixed in CVS.

A stencil mask wasn't being masked correctly for the register upload.
Comment 6 Alan Hourihane 2006-02-18 04:08:56 UTC 
To update, it's the Mesa CVS you need to grab for the fix.

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