[Bug 55500] [sna gen4] corrupt rendering (and flickering on redraw)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55500

--- Comment #62 from Till Matthiesen <high.entropy at web.de> ---
I can't test it, obviously.
The rotated zaphod screen, at which the artefacts appear in my case, is only
available with "sna" enabled.

On a side note:
I tried it nevertheless as I forgot about that.
The result was a segfault of the xserver.

[   406.336] Requested Entity already in use!
[   406.336] (EE) Screen 1 deleted because of no matching config section.
[   406.336] (EE) 
[   406.336] (EE) Backtrace:
[   406.336] (EE) 0: /usr/bin/X (xorg_backtrace+0x36) [0x58a416]
[   406.336] (EE) 1: /usr/bin/X (0x400000+0x18e269) [0x58e269]
[   406.336] (EE) 2: /usr/lib/libpthread.so.0 (0x7f3cfacee000+0xf1e0)
[0x7f3cfacfd1e0]
[   406.336] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7f3cf84d2000+0x16150) [0x7f3cf84e8150]
[   406.336] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7f3cf84d2000+0x17435) [0x7f3cf84e9435]
[   406.336] (EE) 5: /usr/bin/X (xf86DeleteScreen+0x84) [0x480c64]
[   406.336] (EE) 6: /usr/bin/X (xf86BusConfig+0x216) [0x46c086]
[   406.336] (EE) 7: /usr/bin/X (InitOutput+0x956) [0x479df6]
[   406.336] (EE) 8: /usr/bin/X (0x400000+0x26776) [0x426776]
[   406.336] (EE) 9: /usr/lib/libc.so.6 (__libc_start_main+0xf5)
[0x7f3cf9b7aa15]
[   406.336] (EE) 10: /usr/bin/X (0x400000+0x26c9d) [0x426c9d]
[   406.336] (EE) 
[   406.336] (EE) Segmentation fault at address 0x0
[   406.336] 
Fatal server error:
[   406.336] Caught signal 11 (Segmentation fault). Server aborting
[   406.336] 
[   406.336] (EE) 

Wouldn't it be possible to gracefully exit and remind users that rotated setups
are only available with the "sna" option?

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