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[Afiefh <1386867@xxxxxxxxxxxxxxxxxx>]

apport information

** Attachment added: "UdevLog.txt"
   https://bugs.launchpad.net/bugs/1386867/+attachment/4253137/+files/UdevLog.txt

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https://bugs.launchpad.net/bugs/1386867

Title:
  radeon fence failure reduces screen resolution

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  While using Kubuntu 14.10 sometimes the screen blacks out for a few
  seconds and then comes back to life, but often with highly reduced
  resolution. The resolution of the screen actually seems to be fine (as
  evident by taking a screenshot) but things seem to get rendered on a
  much too small buffer and then streched to fit the screen (terrible
  upscaling?). Sorry I'm having a hard time explaining it, but see the
  attached screenshot.

  This actually happened multiple times. One time it logged me out of
  KDE, another time KDE stayed active but the resolution was reduced (or
  whatever this is)

  Attached is the output of dmesg, the relevant error seems to start here:
  [12105.193052] radeon 0000:01:00.0: ring 0 stalled for more than 10140msec
  [12105.193058] radeon 0000:01:00.0: GPU lockup (waiting for 0x00000000000dec08 last fence id 0x00000000000dec03 on ring 0)
  [12105.674184] radeon 0000:01:00.0: Saved 592 dwords of commands on ring 0.
  [12105.674320] radeon 0000:01:00.0: GPU softreset: 0x0000006C
  --- 
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  afiefh     2735 F.... pulseaudio
   /dev/snd/pcmC0D0p:   afiefh     2735 F...m pulseaudio
   /dev/snd/controlC0:  afiefh     2735 F.... pulseaudio
   /dev/snd/controlC1:  afiefh     2735 F.... pulseaudio
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 14.10
  HibernationDevice: RESUME=UUID=2a980291-317d-413c-867c-14dfe0a1e701
  InstallationDate: Installed on 2014-10-17 (17 days ago)
  InstallationMedia: Kubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140923)
  MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
  Package: linux (not installed)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-24-generic.efi.signed root=UUID=f9b26eb7-84d6-4fba-8574-3966b80cdf3a ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-24-generic N/A
   linux-backports-modules-3.16.0-24-generic  N/A
   linux-firmware                             1.138
  Tags:  utopic
  Uname: Linux 3.16.0-24-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  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.

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