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

Some error message could be found in dmesg output, but they won't be
generated when this happens

** Attachment added: "dmesg.log"
   https://bugs.launchpad.net/hwe-next/+bug/1407913/+attachment/4292806/+files/dmesg.log

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https://bugs.launchpad.net/bugs/1407913

Title:
  In 3840x2160 high resolution mode, display would blink with Chrome /
  Chromium browser opened, or with certain page in Firefox

Status in HWE Next Project:
  New
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  CID: 201410-15952 Dell Inspiron 7548

  I'm not sure which package to blame with, I guess maybe it has something to do with X, thing is: 
  when the system is running in 3840*2160 resolution, the display will blink with these browsers under certain conditions.

  Steps:
  1. Install 14.04.1 + update + Chromium + Chrome
  2. Make sure it's running with the highest resolution and open Chrome (39.0.2171.95-1)
  3. Make sure it's running with the highest resolution and open Chromium (39.0.2171.65-0ubuntu0.14.04.1.1064)
  4. Make sure it's running with the highest resolution and open Firefox (34.0+build2-0ubuntu0.14.04.1)
  5. Switch to the second-highest resolution mode and repeat 2-4

  Expected result:
  * Every browser should not intefere the display on this system.

  Actual result:
  * On step 2, display blinks right after Chrome opened, back to normal when you close the browser
  * On step 3, display blinks right after Chromium opened, back to normal when you close the browser
  * On step 4, it won't blink, but if you visit https://bugzilla.mozilla.org/show_bug.cgi?id=1118140 with 100% zoom scale in Firefox, it will blink. If you zoom in or out with ctrl +/- or close it, the display will back to normal.
  * On step 5, non of them will make the display blink
  Note that when it's blinking, you can switch to console with Ctrl + Alt + F1 without any problem. And this happen to Firefox on some other pages as well. 

  
  Verified with:
  3.16.0-28 + open source video driver
  the latest mainline kernel 3.19.0-rc3 + open source video driver
  3.13.0-43 + open source video driver
  3.13.0-43 + the latest AMD video driver (14.501.1003) in both power-saving and performance mode
  they all have the same behaviour.

  Please find the attachment for screencast from step 2 to 4.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-43-generic 3.13.0-43.72
  ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
  Uname: Linux 3.13.0-43-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ubuntu     1766 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     1766 F.... pulseaudio
  CRDA:
   country TW:
   	(2402 - 2472 @ 40), (3, 27)
   	(5270 - 5330 @ 40), (3, 17), DFS
   	(5735 - 5815 @ 40), (3, 30)
  CurrentDesktop: Unity
  Date: Tue Jan  6 03:43:19 2015
  HibernationDevice: RESUME=UUID=3121f09d-4ad7-4946-b905-ee8e56a6d914
  InstallationDate: Installed on 2015-01-05 (0 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Inspiron 7548
  ProcFB:
   0 inteldrmfb
   1 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-43-generic.efi.signed root=UUID=57666a30-96f3-478b-b3c1-3879ce81c53f ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-43-generic N/A
   linux-backports-modules-3.13.0-43-generic  N/A
   linux-firmware                             1.127.11
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/19/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A00
  dmi.board.name: BBE4C1
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA00:bd11/19/2014:svnDellInc.:pnInspiron7548:pvrA00:rvnDellInc.:rnBBE4C1:rvrA00:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Inspiron 7548
  dmi.product.version: A00
  dmi.sys.vendor: Dell Inc.

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