Bug 56520

Summary: Mesa on Intel gen4 makes kwin crash on assertion about virtual_grf_oze
Product: Mesa Reporter: sergio.callegari
Component: Drivers/DRI/i915Assignee: Ian Romanick <idr>
Status: RESOLVED DUPLICATE QA Contact:
Severity: normal    
Priority: medium    
Version: git   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:

Description sergio.callegari 2012-10-29 13:20:20 UTC 
On a DELL E6500, just updated to kubuntu quantal.

Running mesa devel git (commit 8eb2b33... - built 121026)
Running xorg-video-intel 2.20.9 (from ubuntu) with sna.

and kde 4.9.2

Asking kde to log out should fade the display and make the logout dialog appear. During this action, kwin crashes. The xsession-errors file reports

kwin: brw?fs?reg?allocate.cpp:415: bool fs:visitor::assign_regs(): Assertion `this->virtual_grf_sizes[i] >=1 && this->virtual_grf_sizes[i]<=4 && "Register allocation relies on split_virtual_grfs()"' failed

right before the crash.

This does not happen on a standard kubuntu with nvidia graphics and did not use to happen with ubuntu precise, with a slightly different combination of items in the graphics stack (older xorg infrastructure, just slightly older mesa, newer xorg-video-intel)
Comment 1 Ian Romanick 2012-10-29 17:10:10 UTC 
Are you able to reproduce without SNA?
Comment 2 Eric Anholt 2012-10-31 17:59:33 UTC 

*** This bug has been marked as a duplicate of bug 56521 ***

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.