I also have sometimes hangups where CTRL+ALT+F1 and afterwards
CTRL+ALT+F7 brings back GUI response, but very rarely. I am using
Chrome only for Hangouts, for everything else I am using Firefox.

On Thu, Oct 10, 2013 at 4:23 PM, André Panisson
<email address hidden> wrote:
> By the way, switching to the terminal, killing compiz and switching back
> again was able to restore the interface without having to restart
> lightdm and all my applications.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/946899
>
> Title:
>   [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU
>   hung
>
> Status in The Linux Kernel:
>   Incomplete
> Status in The Linux Mint Distribution:
>   Confirmed
> Status in “linux” package in Ubuntu:
>   Triaged
> Status in “linux” package in Fedora:
>   Unknown
>
> Bug description:
>   Since upgrading to 12.04 beta, I've seen this happen twice. The
>   symptoms are:
>
>   - The screen freezes
>   - The backlight turns off
>
>   At that point I have to reboot to get my display back. In syslog, i
>   see:
>
>
>   Mar  4 23:09:18 perseus kernel: [ 3751.612064] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
>   Mar  4 23:09:18 perseus kernel: [ 3751.612076] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state
>   Mar  4 23:09:18 perseus kernel: [ 3751.613658] [drm:i915_wait_request] *ERROR* i915_wait_request returns -11 (awaiting 114040 at 114004, next 114118)
>   Mar  4 23:09:18 perseus kernel: [ 3751.637049] [drm:init_ring_common] *ERROR* render ring initialization failed ctl 00000000 head 00000000 tail 00000000 start 00000000
>
>   followed by a lot of things like:
>
>
>   Mar  4 23:09:18 perseus kernel: [ 3751.700662] WARNING: at /build/buildd/linux-3.2.0/drivers/gpu/drm/i915/intel_display.c:793 intel_enable_pipe+0x14a/0x150 [i915]()
>   Mar  4 23:09:18 perseus kernel: [ 3751.700667] Hardware name: 6465CTO
>   Mar  4 23:09:18 perseus kernel: [ 3751.700670] PLL state assertion failure (expected on, current off)
>
>   Mar  4 23:09:18 perseus kernel: [ 3751.812158] WARNING: at /build/buildd/linux-3.2.0/drivers/gpu/drm/i915/intel_display.c:930 assert_pipe+0x75/0x80 [i915]()
>   Mar  4 23:09:18 perseus kernel: [ 3751.812165] Hardware name: 6465CTO
>   Mar  4 23:09:18 perseus kernel: [ 3751.812170] pipe B assertion failure (expected on, current off)
>
>   then:
>
>
>   Mar  4 23:09:19 perseus kernel: [ 3753.044086] [drm:intel_lvds_enable] *ERROR* timed out waiting for panel to power on
>   Mar  4 23:09:20 perseus kernel: [ 3753.671451] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
>   Mar  4 23:09:20 perseus kernel: [ 3753.684603] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
>   Mar  4 23:09:20 perseus kernel: [ 3753.704594] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
>   Mar  4 23:09:20 perseus kernel: [ 3753.724594] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
>   Mar  4 23:09:20 perseus kernel: [ 3753.744595] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
>   Mar  4 23:09:20 perseus kernel: [ 3753.764606] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
>   Mar  4 23:09:20 perseus kernel: [ 3753.784607] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
>   Mar  4 23:09:20 perseus kernel: [ 3753.804618] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
>   Mar  4 23:09:20 perseus kernel: [ 3753.824606] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 12.04
>   Package: linux-image-3.2.0-17-generic 3.2.0-17.27
>   ProcVersionSignature: Ubuntu 3.2.0-17.27-generic 3.2.6
>   Uname: Linux 3.2.0-17-generic x86_64
>   AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
>   ApportVersion: 1.94-0ubuntu1
>   Architecture: amd64
>   AudioDevicesInUse:
>    USER        PID ACCESS COMMAND
>    /dev/snd/controlC0:  mdz        2458 F.... pulseaudio
>    /dev/snd/controlC1:  mdz        2458 F.... pulseaudio
>   Card0.Amixer.info:
>    Card hw:0 'Intel'/'HDA Intel at 0xfe020000 irq 49'
>      Mixer name : 'Analog Devices AD1984'
>      Components : 'HDA:11d41984,17aa20bb,00100400'
>      Controls      : 31
>      Simple ctrls  : 19
>   Card1.Amixer.info:
>    Card hw:1 'Q9000'/'Logitech, Inc. QuickCam Pro 9000 at usb-0000:00:1a.7-3, high speed'
>      Mixer name : 'USB Mixer'
>      Components : 'USB046d:0990'
>      Controls      : 2
>      Simple ctrls  : 1
>   Card1.Amixer.values:
>    Simple mixer control 'Mic',0
>      Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
>      Capture channels: Mono
>      Limits: Capture 0 - 3072
>      Mono: Capture 0 [0%] [18.00dB] [off]
>   Card29.Amixer.info:
>    Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 7KHT24WW-1.08'
>      Mixer name : 'ThinkPad EC 7KHT24WW-1.08'
>      Components : ''
>      Controls      : 1
>      Simple ctrls  : 1
>   Card29.Amixer.values:
>    Simple mixer control 'Console',0
>      Capabilities: pswitch pswitch-joined penum
>      Playback channels: Mono
>      Mono: Playback [on]
>   Date: Sun Mar  4 23:12:05 2012
>   HibernationDevice: RESUME=UUID=bc555036-0252-42e8-804b-b34dc22bbcd4
>   MachineType: LENOVO 6465CTO
>   PccardctlIdent:
>    Socket 0:
>      no product info available
>   PccardctlStatus:
>    Socket 0:
>      no card
>   ProcEnviron:
>    TERM=xterm
>    LC_COLLATE=C
>    PATH=(custom, user)
>    LANG=en_US.UTF-8
>    SHELL=/bin/zsh
>   ProcFB: 0 inteldrmfb
>   ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-17-generic root=UUID=305dde78-d20a-4248-aaf4-09447b7c5791 ro quiet splash vt.handoff=7
>   RelatedPackageVersions:
>    linux-restricted-modules-3.2.0-17-generic N/A
>    linux-backports-modules-3.2.0-17-generic  N/A
>    linux-firmware                            1.71
>   SourcePackage: linux
>   UpgradeStatus: Upgraded to precise on 2012-03-04 (0 days ago)
>   WpaSupplicantLog:
>
>   dmi.bios.date: 01/21/2008
>   dmi.bios.vendor: LENOVO
>   dmi.bios.version: 7LETB0WW (2.10 )
>   dmi.board.name: 6465CTO
>   dmi.board.vendor: LENOVO
>   dmi.board.version: Not Available
>   dmi.chassis.asset.tag: No Asset Information
>   dmi.chassis.type: 10
>   dmi.chassis.vendor: LENOVO
>   dmi.chassis.version: Not Available
>   dmi.modalias: dmi:bvnLENOVO:bvr7LETB0WW(2.10):bd01/21/2008:svnLENOVO:pn6465CTO:pvrThinkPadT61:rvnLENOVO:rn6465CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
>   dmi.product.name: 6465CTO
>   dmi.product.version: ThinkPad T61
>   dmi.sys.vendor: LENOVO
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/linux/+bug/946899/+subscriptions



-- 
Martin Wildam

http://martin.wildam.org/