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The Xserver crashes randomly after upgrading to Ubuntu 15.10. Before the
update everything was stable.

The problem occured mostly while using Thunderbird but also once while
using Firefox.

The Xserver crashes and I'm logged out. It takes about 10 seconds until
gdm fires up again and I'm able to login again.

The last part of /var/log/Xorg.0.log says:
[ 19778.602] (II) intel(0): resizing framebuffer to 3000x1920
[ 19778.617] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI2 using pipe 1, position (0, 0), rotation left, reflection none
[ 19778.623] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI1 using pipe 0, position (1080, 406), rotation normal, reflection none
[ 19798.610] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI1 using pipe 0, position (1080, 502), rotation normal, reflection none
[ 20012.432] (EE) 
[ 20012.432] (EE) Backtrace:
[ 20012.433] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x55cab7c8f62e]
[ 20012.433] (EE) 1: /usr/bin/X (0x55cab7adb000+0x1b8999) [0x55cab7c93999]
[ 20012.433] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7fe7c651d000+0x352f0) [0x7fe7c65522f0]
[ 20012.433] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe7c28f4000+0x24f18) [0x7fe7c2918f18]
[ 20012.433] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe7c28f4000+0x26157) [0x7fe7c291a157]
[ 20012.433] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe7c28f4000+0x2b4b1) [0x7fe7c291f4b1]
[ 20012.433] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe7c28f4000+0x804e4) [0x7fe7c29744e4]
[ 20012.433] (EE) 7: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe7c28f4000+0x80e2c) [0x7fe7c2974e2c]
[ 20012.433] (EE) 8: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe7c28f4000+0x82e1a) [0x7fe7c2976e1a]
[ 20012.433] (EE) 9: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe7c28f4000+0x4197c) [0x7fe7c293597c]
[ 20012.433] (EE) 10: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe7c28f4000+0x59906) [0x7fe7c294d906]
[ 20012.433] (EE) 11: /usr/bin/X (_CallCallbacks+0x34) [0x55cab7b38654]
[ 20012.433] (EE) 12: /usr/bin/X (WriteToClient+0x244) [0x55cab7c93274]
[ 20012.433] (EE) 13: /usr/bin/X (WriteEventsToClient+0x1e2) [0x55cab7b3e502]
[ 20012.433] (EE) 14: /usr/bin/X (0x55cab7adb000+0xf495a) [0x55cab7bcf95a]
[ 20012.433] (EE) 15: /usr/bin/X (0x55cab7adb000+0xf5ef5) [0x55cab7bd0ef5]
[ 20012.433] (EE) 16: /usr/bin/X (0x55cab7adb000+0x5818f) [0x55cab7b3318f]
[ 20012.433] (EE) 17: /usr/bin/X (0x55cab7adb000+0x5c34b) [0x55cab7b3734b]
[ 20012.433] (EE) 18: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7fe7c653da40]
[ 20012.433] (EE) 19: /usr/bin/X (_start+0x29) [0x55cab7b216c9]
[ 20012.433] (EE) 
[ 20012.433] (EE) Segmentation fault at address 0x0
[ 20012.433] (EE) 
Fatal server error:
[ 20012.433] (EE) Caught signal 11 (Segmentation fault). Server aborting
[ 20012.433] (EE) 
[ 20012.433] (EE) 
Please consult the The X.Org Foundation support 
         at http://wiki.x.org
 for help. 
[ 20012.433] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 20012.433] (EE) 
[ 20012.433] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 20012.456] (EE) Server terminated with error (1). Closing log file.

These parts of dmesg might be interesting:
[    1.661760] input: Logitech USB Keyboard as /devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1.6/3-1.6:1.1/0003:046D:C31C.0003/input/input8
[    1.714657] hid-generic 0003:046D:C31C.0003: input,hidraw2: USB HID v1.10 Device [Logitech USB Keyboard] on usb-0000:00:1a.0-1.6/input1
[    2.530993] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[    2.531006] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun
[    2.531018] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder B
[    2.531026] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder B FIFO underrun
[    2.561370] EXT4-fs (sda6): mounted filesystem with ordered data mode. Opts: (null)
[    2.586624] clocksource: Switched to clocksource tsc
[    2.652818] systemd[1]: Failed to insert module 'kdbus': Function not implemented
[    2.658814] systemd[1]: systemd 225 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ -LZ4 +SECCOMP +BLKID -ELFUTILS +KMOD -IDN)
[    2.658922] systemd[1]: Detected architecture x86-64.

[  626.810377] audit_printk_skb: 45 callbacks suppressed
[  626.810379] audit: type=1400 audit(1446023055.661:26): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/ntpd" pid=7632 comm="apparmor_parser"
[ 1472.735741] perf interrupt took too long (2516 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
[18181.742252] perf interrupt took too long (5015 > 5000), lowering kernel.perf_event_max_sample_rate to 25000
[20027.083426] QXcbEventReader[6871]: segfault at 7f9ae83f1a39 ip 00007f9ae83f1a39 sp 00007f9ae5ea9de0 error 14 in locale-archive[7f9ae847f000+443000]

** Affects: xorg (Ubuntu)
     Importance: Low
         Status: Incomplete

-- 
Intel driver crashes on Ubuntu 15.10
https://bugs.launchpad.net/bugs/1510970
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