Bug#703715: me too, more details
Since upgrading my laptop to wheezy, I experience several freezes per day
This time, I've been able to connect to it remotely and find the dmesg
output matches this bug report:
[ 5449.676827] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer
elapsed... GPU hung
[ 5449.676833] [drm] capturing error event; look for more information in
/debug/dri/0/i915_error_state
In my case, it happened just after waking the machine up from sleep.
The backlight is on, the time and username appear at the top of the
screen, but the login box does not appear. I was able to connect to the
system over the network (wifi) to check the logs. I've tried killing gdm3
I found a long discussion about similar errors on the Ubuntu bug:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/946899
They mention a couple of things:
cat /sys/kernel/debug/dri/0/i915_error_state
doesn't seem to work on Debian
and they suggest a workaround to go in /etc/default/grub:
GRUB_CMDLINE_LINUX_DEFAULT="i915.i915_enable_rc6=0 quiet splash"
My laptop is a Thinkpad X220t
lspci output:
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09)
8086:0126 (rev 09)
I was able to kill the X server and the screen changes, but no matter
what I do (e.g. ctrl-alt-f1, start X again, kill X again) I just can't
interact with the machine any more, I have to reboot it from ssh.
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