Aegisub causes X-server to crash

[Damir]

Sometimes during editing of subtitle program causes xserver to crash.
I got black screen and in several seconds get lighdm prompt

Ubuntu Mate 14.10 AMD 64

Intel HD 2500 video with stock driver
X.Org X Server 1.16.0

aegisub version 3.1.2

In Xorg.0.log.old I see

[ 10383.369] (EE)
[ 10383.369] (EE) Backtrace:
[ 10383.369] (EE) 0: /usr/bin/X (xorg_backtrace+0x56) [0x7fa466cd1f76]
[ 10383.369] (EE) 1: /usr/bin/X (0x7fa466b1b000+0x1bb179) [0x7fa466cd6179]
[ 10383.369] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7fa464850000+0x36eb0) [0x7fa464886eb0]
[ 10383.369] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fa460c3d000+0x6259e) [0x7fa460c9f59e]
[ 10383.369] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fa460c3d000+
0x4debf) [0x7fa460c8aebf]
[ 10383.369] (EE) 5: /usr/bin/X (0x7fa466b1b000+0x13f85d) [0x7fa466c5a85d]
[ 10383.369] (EE) 6: /usr/bin/X (0x7fa466b1b000+0x53a5a) [0x7fa466b6ea5a]
[ 10383.369] (EE) 7: /usr/bin/X (0x7fa466b1b000+0x574f7) [0x7fa466b724f7]
[ 10383.369] (EE) 8: /usr/bin/X (0x7fa466b1b000+0x5b706) [0x7fa466b76706]
[ 10383.369] (EE) 9: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7fa464871ec5]
[ 10383.369] (EE) 10: /usr/bin/X (0x7fa466b1b000+0x45a8e) [0x7fa466b60a8e]
[ 10383.369] (EE)
[ 10383.369] (EE) Segmentation fault at address 0x0
[ 10383.369] (EE)
Fatal server error:
[ 10383.370] (EE) Caught signal 11 (Segmentation fault). Server aborting
[ 10383.370] (EE)
[ 10383.370] (EE)
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
[ 10383.370] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 10383.370] (EE)
[ 10383.370] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 10383.483] (EE) Server terminated with error (1). Closing log file.
(END)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[John Beard (john-j-beard)]

I see exactly the same issue in 3.2.2 (using the stable PPA). The crash log is the same (only the addresses are different).

[Alain Rouet (alain-rouet)]

Found a related bug report here: https://bugs.freedesktop.org/show_bug.cgi?id=77074
Seems to be fixed, but I'll have to wait for the next LTS enablement stack (14.04.3) to check.

The temporary fix is to switch to UXA, as the acceleration method.
https://wiki.archlinux.org/index.php/Intel_graphics#SNA_issues

[Alain Rouet (alain-rouet)]

I don't experience this issue anymore on Ubuntu 14.04 with Vivid kernel and X stack from proposed updates repository. By the way, I never encountered this bug on Vivid, in the first place.

[M D (4o-ubuntu-59)]

Same issue on 3.0.4-2build1 via apt http://nl.archive.ubuntu.com/ubuntu/ trusty/universe amd64

The temporary fix of switching to UXA worked!

Running Ubuntu 14.04 LTS (64-bit) on an Acer Aspire E1-572 laptop.
CPU: Intel Core i5-4200U
GPU: Intel HD Graphics 4400 (on-board graphics) running Intel Haswell Mobile