I've spent so many years running mostly trouble-free Ubuntu installations, I'm not even sure which logs to check... I suppose Xorg is my first guess, and there is a particular error that is repeated many, many times (FBDEV FBIOPUTCMAP) followed by a seg fault. I don't know whether this is related or even problematic, though.
From /var/log/Xorg.0.log:
Code:
... output above here removed ...
[ 265.064] (EE) FBDEV(0): FBIOPUTCMAP: Device or resource busy
[ 265.064] (EE) FBDEV(0): FBIOPUTCMAP: Device or resource busy
[ 265.064] (EE) FBDEV(0): FBIOPUTCMAP: Device or resource busy
[ 265.064] (EE) FBDEV(0): FBIOPUTCMAP: Device or resource busy
[ 265.064] (EE) FBDEV(0): FBIOPUTCMAP: Device or resource busy
[ 265.064] (EE) FBDEV(0): FBIOPUTCMAP: Device or resource busy
[ 265.064] (EE) FBDEV(0): FBIOPUTCMAP: Device or resource busy
[ 265.064] (EE) FBDEV(0): FBIOPUTCMAP: Device or resource busy
[ 265.064] (EE) FBDEV(0): FBIOPUTCMAP: Device or resource busy
[ 265.064] (==) FBDEV(0): DPMS enabled
[ 265.064] (--) RandR disabled
[ 265.064] (EE)
[ 265.064] (EE) Backtrace:
[ 265.065] (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4e) [0x55ca6cc0fe0e]
[ 265.065] (EE) 1: /usr/lib/xorg/Xorg (0x55ca6ca5e000+0x1b5b79) [0x55ca6cc13b79]
[ 265.065] (EE) 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7fabd32ad000+0x11390) [0x7fabd32be390]
[ 265.065] (EE) 3: /usr/lib/xorg/Xorg (RRProviderAutoConfigGpuScreen+0x42) [0x55ca6cb7d232]
[ 265.065] (EE) 4: /usr/lib/xorg/Xorg (InitOutput+0x5bd) [0x55ca6caf6c7d]
[ 265.065] (EE) 5: /usr/lib/xorg/Xorg (0x55ca6ca5e000+0x582d6) [0x55ca6cab62d6]
[ 265.065] (EE) 6: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7fabd2f03830]
[ 265.065] (EE) 7: /usr/lib/xorg/Xorg (_start+0x29) [0x55ca6caa0449]
[ 265.065] (EE)
[ 265.065] (EE) Segmentation fault at address 0x130
[ 265.065] (EE)
Fatal server error:
[ 265.065] (EE) Caught signal 11 (Segmentation fault). Server aborting
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