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[Jeremy Jao <myramenisgone@xxxxxxxxx>]

I have this problem also on my Thinkpad T450s. The warping stopped at
logout when using the xorg-edgers ppa; however, the virtual consoles
still warp (ctrl alt F1-6). If I'm not using xorg-edgers, I have the
same problem for both so...

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https://bugs.launchpad.net/bugs/1450557

Title:
  15.04: Broadwell HD 5500: screen corruption after logout

Status in System76:
  New
Status in linux package in Ubuntu:
  Triaged

Bug description:
  On a 1366x768 Broadwell i3-5010U laptop (System76 Lemur lemu5),
  sometimes after I logout there is strange horizontal
  wrapping/scrolling corruption at the lightdm login screen plus a fixed
  vertical wrapping (see attached video).

  After the first time that the screen goes wonky, I see this error in
  dmesg:

  [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A
  FIFO underrun

  Logging back into to Unity seems to consistently fix the screen
  corruption after a few seconds.

  This doesn't happen every time you logout, but probably happens 1/3 of
  the time or so. Occasionally I'll also see similar corruption during
  shutdown right around the time that X stops and Plymouth takes over.

  Interestingly, on a Broadwell i3 desktop connected to a 1920x1080
  external display via HDMI, I've never encountered this problem. So it
  might be related to the specific 1366x768 screen resolution or to the
  embedded display port (eDP).

  I filed this bug against the kernel because of the dmesg error from
  the DRM module... but the problem could just as likely be in xserver-
  xorg-video-intel.

  For what it's worth, I've tried the latest 4.0 mainline build from the
  kernel PPA as well as the 4.1rc1 mainline build, and this problem
  still exists with both. I've also tried the slightly updated X
  packages for 15.04 from the xorg-edgers PPA, and this problem is
  likewise still present.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-15-generic 3.19.0-15.15
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  oem        1360 F.... pulseaudio
   /dev/snd/controlC0:  oem        1360 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Apr 30 10:23:52 2015
  HibernationDevice: RESUME=UUID=35ecebc1-3c1c-4a1f-9431-ce62b4803c50
  MachineType: System76, Inc. Lemur
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-15-generic root=UUID=395797c2-b33c-46b5-9a64-abfcd6416195 ro acpi_backlight=vendor quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-15-generic N/A
   linux-backports-modules-3.19.0-15-generic  N/A
   linux-firmware                             1.143
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/25/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 5.6.5
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: Lemur
  dmi.board.vendor: System76, Inc.
  dmi.board.version: lemu5
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: System76, Inc.
  dmi.chassis.version: lemu5
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr5.6.5:bd02/25/2015:svnSystem76,Inc.:pnLemur:pvrlemu5:rvnSystem76,Inc.:rnLemur:rvrlemu5:cvnSystem76,Inc.:ct9:cvrlemu5:
  dmi.product.name: Lemur
  dmi.product.version: lemu5
  dmi.sys.vendor: System76, Inc.

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