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[Martin Vielsmaier <446717@xxxxxxxxxxxxxxxxxx>]

When the system is frozen it is enough to kill compiz to break the freeze.
I attached gdb to compiz while frozen, here is the stack:
(gdb) info stack 
#0  0x00007fc45b2d2187 in ioctl () from /lib/libc.so.6
#1  0x00007fc45891e84d in drm_intel_gem_bo_start_gtt_access () from /lib/libdrm_intel.so.1
#2  0x00007fc458d8d70f in ?? () from /usr/lib/dri/i965_dri.so
#3  0x00007fc45ba3d612 in glXSwapBuffers () from /usr/lib/mesa/libGL.so.1
#4  0x0000000000413302 in eventLoop ()
#5  0x000000000040d8e9 in main ()

A second time with some more debug symbols installed:
(gdb) info stack 
#0  0x00007f2c27198187 in ioctl () from /lib/libc.so.6
#1  0x00007f2c247e484d in drm_intel_gem_bo_start_gtt_access (bo=0x1ac6960, write_enable=<value optimized out>)
    at ../../intel/intel_bufmgr_gem.c:1145
#2  0x00007f2c24c5370f in ?? () from /usr/lib/dri/i965_dri.so
#3  0x00007f2c27903116 in ?? () from /usr/lib/mesa/libGL.so.1
#4  0x0000000000412afb in eventLoop ()
#5  0x000000000040d8e9 in main ()

I also believe that this problem is closely linked to OpenGL activity. Before I touch the brightness keys everything is fine. Compiz and glxgears run. When I touched the brightness keys (sometimes I need to touch them more than one time), compiz freezes. When I kill it via a SSH session and then start glxgears it freezes too. 
Attached gdb to frozen glxgears, stack:
(gdb) info stack
#0  0x00007ff3a3abf187 in ioctl () from /lib/libc.so.6
#1  0x00007ff3a1c6c84d in drm_intel_gem_bo_start_gtt_access () from /lib/libdrm_intel.so.1
#2  0x00007ff3a20db70f in ?? () from /usr/lib/dri/i965_dri.so
#3  0x00007ff3a4560612 in glXSwapBuffers () from /usr/lib/mesa/libGL.so.1
#4  0x000000000040339f in ?? ()
#5  0x00007ff3a39ffc4d in __libc_start_main () from /lib/libc.so.6
#6  0x00000000004018c9 in ?? ()
#7  0x00007fff1b7b1d78 in ?? ()
#8  0x000000000000001c in ?? ()
#9  0x0000000000000001 in ?? ()
#10 0x00007fff1b7b3645 in ?? ()
#11 0x0000000000000000 in ?? ()

Second time:
(gdb) info stack
#0  0x00007f0027c5d187 in ioctl () from /lib/libc.so.6
#1  0x00007f0025e0a84d in drm_intel_gem_bo_start_gtt_access (bo=0x25f8be0, write_enable=<value optimized out>)
    at ../../intel/intel_bufmgr_gem.c:1145
#2  0x00007f002627970f in ?? () from /usr/lib/dri/i965_dri.so
#3  0x00007f00286fe612 in glXSwapBuffers () from /usr/lib/mesa/libGL.so.1
#4  0x000000000040339f in ?? ()
#5  0x00007f0027b9dc4d in __libc_start_main () from /lib/libc.so.6
#6  0x00000000004018c9 in ?? ()
#7  0x00007ffff7897138 in ?? ()
#8  0x000000000000001c in ?? ()
#9  0x0000000000000001 in ?? ()
#10 0x00007ffff7897680 in ?? ()
#11 0x0000000000000000 in ?? ()

Any ideas what could trigger the bug? (Note that when the brightness
keys were touched once, this bug persists. So I think that some register
on the graphics card is set wrong and from then on causes problems... Is
there a way to read them all at once to see what changes?)

-- 
[gm45] Adjusting Brightness in Acer Aspire Timelines causes system freeze in 4810T and 5810T models
https://bugs.launchpad.net/bugs/446717
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