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pfrenssen

Member

Registered: 2012-04-09

Posts: 14

[SOLVED] Segmentation fault starting x, probably related to Intel gfx

I am using a Lenovo X1 Carbon 1st gen. When I try to start X most of the time I get a segfault:

[  2221.776] (II) intel(0): EDID vendor "LGD", prod id 898
[  2221.776] (II) intel(0): Printing DDC gathered Modelines:
[  2221.776] (II) intel(0): Modeline "1600x900"x0.0  108.00  1600 1648 1680 1924  900 903 908 936 -hsync -vsync (56.1 kHz eP)
[  2221.910] (EE) 
[  2221.910] (EE) Backtrace:
[  2221.910] (EE) 0: /usr/lib/xorg-server/Xorg (OsLookupColor+0x139) [0x594d49]
[  2221.912] (EE) 1: /usr/lib/libc.so.6 (__restore_rt+0x0) [0x7f1d4813732f]
[  2221.913] (EE) 2: /usr/lib/libpixman-1.so.0 (pixman_region_fini+0x9) [0x7f1d4904b4d9]
[  2221.914] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so (_init+0x58a56) [0x7f1d42f4fcd6]
[  2221.914] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so (_init+0x56621) [0x7f1d42f4ad81]
[  2221.915] (EE) 5: /usr/lib/xorg-server/Xorg (DamageRegionAppend+0x621) [0x518ae1]
[  2221.915] (EE) 6: /usr/lib/xorg-server/Xorg (AddTraps+0x40d7) [0x511f57]
[  2221.915] (EE) 7: /usr/lib/xorg-server/Xorg (SendErrorToClient+0x2df) [0x43623f]
[  2221.916] (EE) 8: /usr/lib/xorg-server/Xorg (remove_fs_handlers+0x453) [0x43a263]
[  2221.917] (EE) 9: /usr/lib/libc.so.6 (__libc_start_main+0xf0) [0x7f1d48124710]
[  2221.917] (EE) 10: /usr/lib/xorg-server/Xorg (_start+0x29) [0x424589]
[  2221.919] (EE) 11: ? (?+0x29) [0x29]
[  2221.919] (EE) 
[  2221.919] (EE) Segmentation fault at address 0x0
[  2221.919] (EE) 
Fatal server error:
[  2221.919] (EE) Caught signal 11 (Segmentation fault). Server aborting

Full log is here: http://pastebin.com/NLBGfBgB

I can usually start it after a number of retries, but sometimes I have to retry 20 times or more before I can finally start X.

If I turn off hardware acceleration with the "NoAccel" option then X doesn't crash, but my desktop becomes practically unusable because of rendering artifacts and terribly slow performance.

Here is the info from lspci:

00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA controller])
	Subsystem: Lenovo Device 21f9
	Flags: bus master, fast devsel, latency 0, IRQ 28
	Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
	Memory at e0000000 (64-bit, prefetchable) [size=256M]
	I/O ports at 4000 [size=64]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
	Capabilities: [d0] Power Management version 2
	Capabilities: [a4] PCI Advanced Features
	Kernel driver in use: i915
	Kernel modules: i915

Last edited by pfrenssen (2016-04-11 09:02:57)

swalladge

Member

Registered: 2013-10-22

Posts: 32

Re: [SOLVED] Segmentation fault starting x, probably related to Intel gfx

Try setting the acceleration method to 'uxa'. I've been having the same problem, and so far this has stopped the OsLookupColor crashes.

Section "Device"
   Identifier  "Intel Graphics"
   Driver      "intel"
   Option      "AccelMethod"  "uxa"
EndSection

The wiki also has other suggestions - such as the i915.semaphores=1 boot parameter.

pfrenssen

Member

Registered: 2012-04-09

Posts: 14

Re: [SOLVED] Segmentation fault starting x, probably related to Intel gfx

Great! That seems to solve it. I have been able to start X twice without issue. Thanks a lot!