[Intel-gfx] 945gm: xrandr crashes X

[Chris Wilson]

On Tue, 25 May 2010 10:38:51 +0300, Vasily Khoruzhick <anarsoul at gmail.com> wrote:
> Hi, after upgrade to 2.6.34 kernel I'm unable to configure external VGA 
> monitor anymore, any attempt to use xrandr results in X crash with following 
> message:
> 
> X: intel_bufmgr_gem.c:900: drm_intel_gem_bo_unreference_locked_timed: 
> Assertion `((&bo_gem->refcount)->atomic) > 0' failed.
> 
> There's a bug entry in gentoo bugzilla, however they blame xorg-server, but 
> xorg-server-1.8.x works for me with 2.6.33.x kernel:
> 
> http://bugs.gentoo.org/show_bug.cgi?id=318743
> 
> Is it known/fixed issue, or should I file a new bug on fd.o bugzilla?

commit 9f54107f866a25cf670f81f7c52b8c108728c6a5
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue May 11 14:55:16 2010 +0100

    dri2: Handle reference counting across page flipping

    1. Instead of swapping bos, swap the entire private structure.

    2. If we update the pixmap bo for the Screen, make sure we update the
    reference inside intel->front_buffer so that xrandr still functions.

    Fixes:

      Bug 27922 - i965: Rapidly resizing OpenGL window causes GPU to hang.
      https://bugs.freedesktop.org/show_bug.cgi?id=27922

-- 
Chris Wilson, Intel Open Source Technology Centre