Xorg freezes

[Afiefh]

After a few seconds the GUI disappears and I'm left with a CLI saying Radeon: Error couldn't schedule IB.

This seems to happen more often when I'm running videos than under normal load. In this case I was running an mp4 file with h.264 video and AAC audio in VLC.

More than willing to help figure out the issue, but I'm not sure I have the technical skills to compile the whole Xorg stack myself.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: xorg 1:7.7+7ubuntu2
ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
Uname: Linux 3.16.0-28-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
BootLog:
 * Setting up X socket directories... 
[ OK ]
  * Restoring resolver state... 
[ OK ]
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: kwin
Date: Sat Dec 27 16:35:21 2014
DistUpgraded: Fresh install
DistroCodename: utopic
DistroVariant: ubuntu
ExtraDebuggingInterest: No
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Pitcairn PRO [Radeon HD 7850] [1002:6819] (prog-if 00 [VGA controller])
   Subsystem: Gigabyte Technology Co., Ltd Device [1458:2553]
InstallationDate: Installed on 2014-10-17 (70 days ago)
InstallationMedia: Kubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140923)
LightdmGreeterLog:
 QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: No such file or directory
 QFileSystemWatcher: failed to add paths: /var/lib/lightdm/.config/ibus/bus
 Bus::open: Can not get ibus-daemon's address.
 IBusInputContext::createInputContext: no connection to ibus-daemon
 file:///usr/share/kde4/apps/lightdm-kde-greeter/themes/userbar/main.qml:135: Unable to assign [undefined] to QString usersession
LightdmGreeterLogOld:
 QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: No such file or directory
 QFileSystemWatcher: failed to add paths: /var/lib/lightdm/.config/ibus/bus
 Bus::open: Can not get ibus-daemon's address.
 IBusInputContext::createInputContext: no connection to ibus-daemon
 file:///usr/share/kde4/apps/lightdm-kde-greeter/themes/userbar/main.qml:135: Unable to assign [undefined] to QString usersession
MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-28-generic.efi.signed root=UUID=f9b26eb7-84d6-4fba-8574-3966b80cdf3a ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/06/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F16
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: H77-D3H
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF16:bd12/06/2013:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnH77-D3H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.56-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.0-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.0-0ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
xserver.bootTime: Sat Dec 27 16:22:58 2014
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.16.0-1ubuntu1.2
xserver.video_driver: radeon

[penalvch (penalvch)]

Afiefh, thank you for reporting this and helping make Ubuntu better. Could you please capture the trace following https://help.ubuntu.com/community/DebuggingSystemCrash ?

[Afiefh (afiefh)]

Will do as soon as the problem occurs again. At least now I finally know what the SysRq button is for!

[Launchpad Janitor (janitor)]

[Expired for xorg (Ubuntu) because there has been no activity for 60 days.]