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[Bug 1515776] Re: After suspend-resume graphics are sluggish and input lags with displayport connected


Michiel Janssens, thank you for reporting this and helping make Ubuntu

Could you please test the latest upstream kernel available from the very
top line at the top of the page from http://kernel.ubuntu.com/~kernel-
ppa/mainline/?C=N;O=D (the release names are irrelevant for testing, and
please do not test the daily folder)? Install instructions are available
at https://wiki.ubuntu.com/Kernel/MainlineBuilds . This will allow
additional upstream developers to examine the issue.

If the latest kernel did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this issue is fixed in the mainline kernel, please add the following tags by clicking on the yellow circle with a black pencil icon, next to the word Tags, located at the bottom of the report description:

Where X, Y, and Z are numbers corresponding to the kernel version.

If the mainline kernel does not fix the issue, please add the following tags:

Please note, an error to install the kernel does not fit the criteria of

Once testing of the latest upstream kernel is complete, please mark this
report's Status as Confirmed. Please let us know your results.

Thank you for your understanding.

** Tags added: bisect-done regression-release

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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  After suspend-resume graphics are sluggish and input lags with
  displayport connected

Status in linux package in Ubuntu:

Bug description:
  This bug could be related to 1412730

  Description of the issue:
  Booting up with displayport connected to Dell U2415 monitor, graphics and input is responsive, also after logging in.
  However after resuming from suspend-to-ram, graphics are sluggish and input has lag.
  - transition from unity greeter login locked status to unlocked status: 6 seconds (normal 1 second)
  - transition from clicking dash and getting window: 2-3 seconds (normal <1 second)
  - starting gedit: 4 seconds (normal <1 second)
  - mouse lags, sometimes the pointer is still on the left side of the screen, while it should be on the right
  - input from keyboard lags, about 1-2 seconds (normal no lag)

  When unplugging the Displayport cable:
  all lag is gone

  When plugging displayport back in again:
  lag is back, same as before

  This issue only happens after suspend-resume.
  After a reboot, response of graphics and input is normal
  So two options to get rid of the lag: unplug DP or reboot.

  Further investigation:
  Did a mainline kernel bisect:
  From 3.13.11-ckt27 (good) to v4.3-wily (bad)
  First bad is v4.0-rc1-vivid
  Did a kernel commit bisect:
  From 3.19 (good) to 4.0-rc1 (bad)
  first bad commit: [e55bca26188e45f209597abf986c87cc5a49894a] radeon/audio: enable DP audio

  Commit bisect log is attached

  My daily baseline is 14.04.3 with HWE-Vivid.
  But because in the current HWE-Vivid this issue isn't present I'm reporting it via Wily as you can see in the logs.
  I repeated testing of last good and first bad kernels on both 14.04.3 with HWE-Vivid and 15.10.
  Exactly the same behaviour.
  I mention this because if this bug wont be fixed, it will still be there in the upcoming HWE-Wily also.
  And if thats the case, I won't be able to suspend my laptop without this issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-18-generic 4.2.0-18.22
  ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
  Uname: Linux 4.2.0-18-generic x86_64
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
   /dev/snd/controlC0:  michiel    1788 F.... pulseaudio
   /dev/snd/controlC1:  michiel    1788 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Nov 12 22:08:27 2015
  HibernationDevice: RESUME=UUID=d0de679a-8c90-4a25-a84a-8d3c25eb0a10
  InstallationDate: Installed on 2015-10-31 (12 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: Hewlett-Packard HP EliteBook 8740w
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@wily/boot/vmlinuz-4.2.0-18-generic root=UUID=f16430cd-a447-4cf2-8f8b-ce233e03d462 ro rootflags=subvol=@wily quiet splash vt.handoff=7
   linux-restricted-modules-4.2.0-18-generic N/A
   linux-backports-modules-4.2.0-18-generic  N/A
   linux-firmware                            1.149.1
  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: 07/07/2014
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68CAD Ver. F.50
  dmi.board.name: 1520
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 33.31
  dmi.chassis.asset.tag: CNU1152Q9W
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68CADVer.F.50:bd07/07/2014:svnHewlett-Packard:pnHPEliteBook8740w:pvr:rvnHewlett-Packard:rn1520:rvrKBCVersion33.31:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook 8740w
  dmi.sys.vendor: Hewlett-Packard

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