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[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

ubuntu@ubuntu-Vostro-3458:~$ /usr/lib/nux/unity_support_test -c -p
OpenGL vendor string:   Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) HD Graphics 5500 (Broadwell GT2) 
OpenGL version string:  3.0 Mesa 10.5.2

Not software rendered:    yes
Not blacklisted:          yes
GLX fbconfig:             yes
GLX texture from pixmap:  yes
GL npot or rect textures: yes

Compiz supported:         yes

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https://bugs.launchpad.net/bugs/1465108

Title:
  [Dell Vostro 3458] System will start blinking after switch to virtual
  terminal

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  On this I+N hybrid graphic system, when switching to Virtual Terminal
  with Ctrl + Alt + F1, the display will start blinking and

  Steps:
  1. Install 14.04.2 + update
  2. Switch to VT with Ctrl + Alt + F1
  3. Switch back with Ctrl + Alt + F7

  Expected result:
  Everything should work as expected.

  Actual result:
  It will start blinking, error message could be found in dmesg output, please find the attachment for the video.

  [ 3765.731436] [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
  *ERROR* CPU pipe A FIFO underrun

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-20-generic 3.19.0-20.20
  ProcVersionSignature: Ubuntu 3.19.0-20.20-generic 3.19.8
  Uname: Linux 3.19.0-20-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ubuntu     1205 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     1205 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Jun 14 22:48:50 2015
  HibernationDevice: RESUME=UUID=e9508693-344c-4086-8491-70a51cabd161
  InstallationDate: Installed on 2015-06-12 (2 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: Dell Inc. Vostro 3458
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-20-generic root=UUID=ed5bbf8c-21d8-4bca-ae2b-d803cc0fc1ad ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-20-generic N/A
   linux-backports-modules-3.19.0-20-generic  N/A
   linux-firmware                             1.143.1
  RfKill:
   
  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: 01/07/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: X13
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrX13:bd01/07/2015:svnDellInc.:pnVostro3458:pvr01:rvnDellInc.:rn:rvr:cvnDellInc.:ct9:cvr:
  dmi.product.name: Vostro 3458
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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