[Bug 85330] xorg-server segfault when radeon driver are activated

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85330

--- Comment #12 from Chris Wilson <chris at chris-wilson.co.uk> ---
The last backtrace doesn't match the one in the Xorg.0.log. If I had to guess I
would say it is an older version of -intel - because it is hitting

commit 07fe45b84bdf0d236a5bfdc433cc1a908e0c161b
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Sep 9 08:12:45 2014 +0100

    sna/glyphs: Prevent NULL vfunc deref with glyphs

    Requires running a PRIME setup with Intel loaded as the secondary GPU
    and attempting to execute an empty glyph string.

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

Does that make sense? (Oh, that patch is only available in git).

Could you try and get a 'bt full' for

[   175.807] (EE) intel(0): Failed to set backlight intel_backlight for output
eDP1, disabling
[   175.807] (EE) 
[   175.807] (EE) Backtrace:
[   175.841] (EE) 0: /usr/bin/Xorg.bin (xorg_backtrace+0x56) [0x593a46]
[   175.841] (EE) 1: /usr/bin/Xorg.bin (0x400000+0x197b99) [0x597b99]
[   175.841] (EE) 2: /usr/lib/libc.so.6 (0x7f8415a89000+0x339f0)
[0x7f8415abc9f0]
[   175.841] (EE) 3: /usr/bin/Xorg.bin (RRDeleteOutputProperty+0x9) [0x4fce49]
[   175.841] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7f8410a66000+0x6410e) [0x7f8410aca10e]
[   175.841] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7f8410a66000+0x6431d) [0x7f8410aca31d]
[   175.841] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7f8410a66000+0x64961) [0x7f8410aca961]
[   175.841] (EE) 7: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7f8410a66000+0x6688c) [0x7f8410acc88c]
[   175.841] (EE) 8: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7f8410a66000+0x6e59e) [0x7f8410ad459e]
[   175.841] (EE) 9: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7f8410a66000+0x6e778) [0x7f8410ad4778]
[   175.841] (EE) 10: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7f8410a66000+0x70bce) [0x7f8410ad6bce]
[   175.841] (EE) 11: /usr/bin/Xorg.bin (0x400000+0xadae7) [0x4adae7]
[   175.841] (EE) 12: /usr/bin/Xorg.bin (0x400000+0x1148c2) [0x5148c2]
[   175.841] (EE) 13: /usr/bin/Xorg.bin (0x400000+0xcbc08) [0x4cbc08]
[   175.841] (EE) 14: /usr/bin/Xorg.bin (0x400000+0x112f6c) [0x512f6c]
[   175.841] (EE) 15: /usr/bin/Xorg.bin (0x400000+0x3b977) [0x43b977]
[   175.842] (EE) 16: /usr/lib/libc.so.6 (__libc_start_main+0xf0)
[0x7f8415aa9040]
[   175.842] (EE) 17: /usr/bin/Xorg.bin (0x400000+0x25d0e) [0x425d0e]
[   175.842] (EE) 
[   175.842] (EE) Segmentation fault at address 0x0

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