kernel-packages team mailing list archive

[Jani-nikula <1554613@xxxxxxxxxxxxxxxxxx>]

(In reply to Pranith Kumar from comment #55)
> Is this really resolved? The problem is gone, but I don't think anyone
> identified what is really causing the problem to occur.

In a perfect world we'd get to the roots of every problem, but in
reality we don't have the time to keep debugging issues that seem to be
gone. Especially in areas where we've done a lot of fixing upstream.

> Also, we need to
> identify which patch fixed the issue so that it can be back-ported. Both 4.5
> and 4.6 kernels have this problem.

If the v4.6-rc kernels still have the issue, but drm-intel-nightly
works, it should be a pretty straightforward reverse bisect to find the
commit that fixed the bug. If you provide that, it may be possible to do
the backport.

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https://bugs.launchpad.net/bugs/1554613

Title:
  screen flickering on XPS13 9350

Status in Linux:
  Fix Released
Status in linux package in Ubuntu:
  Triaged

Bug description:
  see LP: #1552304

  does not affect 4.4.0-8
  affects 4.4.0-9 to 4.4.0-16

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-generic 4.4.0.11.12
  ProcVersionSignature: Ubuntu 4.4.0-8.23-generic 4.4.2
  Uname: Linux 4.4.0-8-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  tbonfort   1498 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Tue Mar  8 09:57:12 2016
  HibernationDevice: RESUME=UUID=3248e0d7-0dac-4ccc-8982-b5ac5ce6ed5e
  InstallationDate: Installed on 2016-01-07 (61 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 0c45:670c Microdia
   Bus 001 Device 002: ID 0a5c:6412 Broadcom Corp.
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. XPS 13 9350
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-8-generic root=UUID=757547b8-d0e4-4eb8-8afd-920b743f99a4 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-8-generic N/A
   linux-backports-modules-4.4.0-8-generic  N/A
   linux-firmware                           1.156
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-02-28 (9 days ago)
  dmi.bios.date: 01/08/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.2.3
  dmi.board.name: 07TYC2
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr1.2.3:bd01/08/2016:svnDellInc.:pnXPS139350:pvr:rvnDellInc.:rn07TYC2:rvrA01:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9350
  dmi.sys.vendor: Dell Inc.

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