Screen lockup under XMir

[Stuart Langridge]

I experienced a strange screen lockup. My screen was unresponsive: no mouse movement, nothing changes. Switching to a VC was possible, and the VC was not locked up. Switching back again to X (under XMir, console 7) worked for a second, maybe two seconds, and then the screen would freeze again. Switching to VC and then back to X would again give a second or so of visual activity. Actions I performed did appear to take effect while the screen was frozen, but were not shown on screen: for example, I was able to highlight some text in a browser, and then press alt+f2 and start an xterm, by doing it "blind": switching to a VC and then back to X showed that these things had happened.

In the VC, dmesg showed this:
[107758.813860] iwlwifi 0000:02:00.0: Q 17 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[107758.813926] iwlwifi 0000:02:00.0: Q 18 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[107758.813988] iwlwifi 0000:02:00.0: Q 19 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
[111224.241455] systemd-timedated[23894]: /etc/localtime should be a symbolic link to a timezone data file in /usr/share/zoneinfo/.
[111461.792036] [drm:i915_hangcheck_elapsed] *ERROR* stuck on render ring
[111461.792050] [drm:i915_hangcheck_elapsed] *ERROR* stuck on blitter ring
[111461.792054] [drm] capturing error event; look for more information in /sys/kernel/debug/dri/0/i915_error_state
[111462.309818] systemd-udevd[24067]: failed to execute '/lib/udev/socket:@/org/freedesktop/hal/udev_event' 'socket:@/org/freedesktop/hal/udev_event': No such file or directory
[111465.289960] systemd-udevd[24087]: failed to execute '/lib/udev/socket:@/org/freedesktop/hal/udev_event' 'socket:@/org/freedesktop/hal/udev_event': No such file or directory
[111465.292790] systemd-udevd[24088]: failed to execute '/lib/udev/socket:@/org/freedesktop/hal/udev_event' 'socket:@/org/freedesktop/hal/udev_event': No such file or directory

The lines about i915 seemed relevant. Attached to this bug is a copy of the
/sys/kernel/debug/dri/0/i915_error_state file.

I restarted lightdm from the VC and was given the opportunity to log in, but the system then showed a dialog box saying that I was in "low-graphics mode". I chose to exit to a console, at which point things seemed to hang. I switched back to the VC and rebooted with "sudo reboot" and the machine came back fine.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: unity-system-compositor 0.0.1+13.10.20130903-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-4.9-generic 3.11.0-rc7
Uname: Linux 3.11.0-4-generic x86_64
ApportVersion: 2.12.1-0ubuntu3
Architecture: amd64
CheckboxSubmission: 4d186c1dd89d3ba4cb89f5ee55713686
CheckboxSystem: bb422ca46d02494cdbc459927a98bc2f
Date: Mon Sep 9 17:50:24 2013
EcryptfsInUse: Yes
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:3975]
InstallationDate: Installed on 2011-12-11 (637 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20111211)
LightDMLog: Error: [Errno 13] Permission denied: '/var/log/lightdm/lightdm.log'
MarkForUpload: True
SourcePackage: unity-system-compositor
UnitySystemCompositorLog: Error: [Errno 13] Permission denied: '/var/log/lightdm/unity-system-compositor.log'
UpgradeStatus: Upgraded to saucy on 2013-09-05 (3 days ago)
version.libdrm: libdrm2 2.4.46-1
version.lightdm: lightdm 1.7.12-0ubuntu1
version.mesa: libegl1-mesa-dev N/A

[Daniel van Vugt (vanvugt)]

Hang check is a driver bug

[Timo Aaltonen (tjaalton)]

xmir is dead