Using the latest 3.13-rc7 on two of my AMD machines, both of which have Radeon HD 6850 graphics cards in them, the system crashes when playing videos. I think it may be easier to cause the crash when playing a video that is 720p+. It also is not limited to crashing when playing videos, but can also crash simply from browsing the web or doing anything that causes a demand on the GPU. It may or may not be related to DPM implemented in the latest kernels. Using kernel 3.12 from Trusty repos with DPM enabled, it works fine. I have a machine with a Radeon HD 7950 but I have not tested it yet. Similarly, I have used an AMD Richland APU which crashes with kernel 3.13 immediately on the login screen. Put simply, there needs to be a lot of testing of AMD chips before releasing kernel 3.13 for Trusty stable.
WORKAROUND: I found that if I disable DPM by editing /etc/default/grub and adding radeon.dpm=0 to CMDLINE_LINUX that the crashing stops.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.12.0-7-generic 3.12.0-7.15
ProcVersionSignature: Ubuntu 3.12.0-7.15-generic 3.12.4
Uname: Linux 3.12.0-7-generic x86_64
ApportVersion: 2.12.7-0ubuntu6
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: ching 2397 F.... pulseaudio
/dev/snd/controlC0: ching 2397 F.... pulseaudio
CRDA:
country AU:
(2402 - 2482 @ 40), (N/A, 20)
(5170 - 5250 @ 40), (3, 23)
(5250 - 5330 @ 40), (3, 23), DFS
(5735 - 5835 @ 40), (3, 30)
CurrentDesktop: Unity
Date: Tue Jan 7 23:50:13 2014
HibernationDevice: RESUME=UUID=39d467a4-e793-46df-9a88-10813a999704
MachineType: System manufacturer System Product Name
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.12.0-7-generic root=UUID=1533ba1d-4ff6-4974-839f-5074ef65a6f1 ro splash quiet radeon.audio=1 radeon.dpm=1 vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.12.0-7-generic N/A
linux-backports-modules-3.12.0-7-generic N/A
linux-firmware 1.119
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/13/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3503
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A78T-E
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3503:bd04/13/2011:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A78T-E:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
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