touch-packages team mailing list archive

[Mika-kahola <1522922@xxxxxxxxxxxxxxxxxx>]

Thank you Tom for the syslog. From the log the DP link training is
completed but for some reason the DP channel equalization fails. At this
point we request to do link training once again and now first we try
first the drive current and pre-emphasis levels from the previous link
training. Instead of reusing these values, we should restart the link
training with zero drive current and pre-emphasis levels. This is fixed
at the 3rd patch of this series.

Please, try out this series of patches on top of the drm-intel-nighly
and report back.

https://patchwork.freedesktop.org/patch/69394/
https://patchwork.freedesktop.org/patch/69395/
https://patchwork.freedesktop.org/patch/69396/

flux242 seems to have a clock recovery issue. This fix may provide a
solution for that as well.

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to libdrm in Ubuntu.
https://bugs.launchpad.net/bugs/1522922

Title:
  Screen flickering in Intel i915 driver

Status in Nouveau Xorg driver:
  Incomplete
Status in libdrm package in Ubuntu:
  Confirmed

Bug description:
  There's an upstream bug reported here
  https://bugs.freedesktop.org/show_bug.cgi?id=91393 that causes screen
  flickering when using the Intel i915 builtin driver (at resolutions
  lower than the maximal one).

  I think that it will be fixed in newer kernel versions, but for the
  time being, as reported here
  https://bugs.freedesktop.org/show_bug.cgi?id=91393#c25 (and as
  personally tested) reverting those two commits fixes the problem.

  Would that be possible to release a fixed version for the 4.2.0
  stream?

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-19-generic 4.2.0-19.23
  ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
  Uname: Linux 4.2.0-19-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  bettini    1378 F.... pulseaudio
   /dev/snd/controlC1:  bettini    1378 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Fri Dec  4 19:01:00 2015
  HibernationDevice: RESUME=UUID=7ddbc972-3ad6-40de-9313-2bb9395145f9
  InstallationDate: Installed on 2015-05-08 (210 days ago)
  InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Dell Inc. Dell Precision M3800
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-19-generic root=UUID=dd2c7064-53b9-4720-96ab-5e8a3f2db3ea ro noprompt quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-19-generic N/A
   linux-backports-modules-4.2.0-19-generic  N/A
   linux-firmware                            1.149.3
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-11-07 (26 days ago)
  dmi.bios.date: 08/17/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A10
  dmi.board.name: Dell Precision M3800
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A10
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA10:bd08/17/2015:svnDellInc.:pnDellPrecisionM3800:pvrA10:rvnDellInc.:rnDellPrecisionM3800:rvrA10:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Dell Precision M3800
  dmi.product.version: A10
  dmi.sys.vendor: Dell Inc.

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