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[Bug 1577364] Re: Screen flickers after upgrade to 16.04 from 15.10 on Dell XPS13 9350


sohey, the next step is to fully reverse commit bisect from kernel 4.4
to 4.6-rc6 in order to identify the last bad commit, followed
immediately by the first good one. Once this good commit has been
identified, it may be reviewed for backporting. Could you please do this

Please note, finding adjacent kernel versions is not fully commit

After the fix commit (not kernel version) has been identified, then
please mark this report Status Confirmed.

Thank you for your understanding.

Helpful bug reporting tips:

** Tags added: bios-outdated-1.3.3 kernel-fixed-upstream-4.6-rc6

** Tags added: needs-reverse-bisect

** Tags added: regression-release

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

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  Screen flickers after upgrade to 16.04 from 15.10 on Dell XPS13  9350

Status in linux package in Ubuntu:

Bug description:
  Screen flickers after upgrade to 16.04 from 15.10 on Dell XPS13  9350.

  Flickers frequently on mid-range brightness, better on high and low
  range brightness.

  Tried to turn off tlp but doesn't help

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-21-generic 4.4.0-21.37
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
   /dev/snd/controlC0:  seanl      1895 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon May  2 21:27:58 2016
  HibernationDevice: RESUME=UUID=8c16e7e0-1b67-4bf7-b502-25e5d6de6d81
  InstallationDate: Installed on 2015-12-16 (138 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 0c45:670c Microdia 
   Bus 001 Device 003: 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-4.4.0-21-generic.efi.signed root=UUID=0d974029-002f-443f-b682-4209064663d0 ro acpi_sleep=nonvs quiet splash vt.handoff=7
   linux-restricted-modules-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-04-22 (9 days ago)
  dmi.bios.date: 11/27/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.1.7
  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.:bvr1.1.7:bd11/27/2015:svnDellInc.:pnXPS139350:pvr:rvnDellInc.:rn07TYC2:rvrA01:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9350
  dmi.sys.vendor: Dell Inc.

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