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[Michiel Janssens <1515776@xxxxxxxxxxxxxxxxxx>]

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https://bugs.launchpad.net/bugs/1515776

Title:
  1002:68a0 After suspend-resume graphics are sluggish and input lags
  with displayport connected

Status in linux package in Ubuntu:
  Triaged

Bug description:
  This bug could be related to 1412730
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/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.
  Examples:
  - 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
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /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
  RelatedPackageVersions:
   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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