Perhaps this is a related issue: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/946899
As I noted in the comments for that issue: This issue impacts me multiple times a week. Sometimes the mouse continues to work but other times the mouse freezes also. I have not yet tried to open a teminal as suggested by bduncan (comment #13) but I am usually able to switch to the first terminal and kill compiz. My freeze often occurs when switching workspaces. I often have thunderbird and chromium running laterally in desktop 1 and 2 respectively (of four total) and use an external drive on either a laptop or a netbook with an external display attached. The problem exists regardless of the hardware I am using. When the freeze occurs and I can get to tty1, killing compiz is my work around. I usually use sudo top and find the compiz pid and kill it with signal 3. When I switch back to tty7 the screen will trigger the clearing of the freeze after I switch to it (tty7). Then compiz restarts and after a few moments (perhaps a minute) I am back working with the application which were open. When the freeze occurs and the keyboard becomes unresponsive (unable to switch to tty1) I must do a hard reboot to continue working from a restart. I have looked into the log files and searched for any instance of compiz logging the freeze. All I have found is the indication I have killed the process. Compiz does not seem to be tied into the apport system for reporting. I expect there are several more users with this problem but the freezes go unreported as users have no idea what to do about it. Unfortunately these unknown freezes (unknown to development community) will continue until these problems are given priority and addressed. Bottom line is that such freezes are like the blue screen of death and give potential adopters of ubuntu a crummy experience and all the more reason to switch back to something more familiar or "stable". Compiz has made my user experience a challenging one. To that end I have enjoyed lighter interfaces including crunchbang and trisquel. I have been reluctant to go beyond the 12.04 LTS version as I am concerned my hardware is not up to the task. Compiz IMO provides me an awful experience and these problems give me pause to encourage others to the platform. I implore those developers with more understanding of the freeze issue to put some heat on this problem and investigate what is going on and fix this. To ignore this further may render any other work on the ubuntu project to be moot if the user experience continues to suffer, IMO. I am happy to contribute what I can to help address this but I do not have deep knowledge of the compiz system. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
