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[pranith <1555158@xxxxxxxxxxxxxxxxxx>]

** Summary changed:

- Screen glitch in kernel 4.4.0-11
+ Screen flickering in kernel 4.4.0-11 -  XPS 9550

** Summary changed:

- Screen flickering in kernel 4.4.0-11 -  XPS 9550
+ Screen flickering in kernel  > 4.4.0-8 on  XPS 9550

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https://bugs.launchpad.net/bugs/1555158

Title:
  Screen flickering in kernel  > 4.4.0-8 on  XPS 9550

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Xenial:
  Confirmed

Bug description:
  On my Dell XPS 15 9550(core i3 integrated graphics), the screen started glitching on kernel 4.4.0-11. This glitching goes away if I reboot to kernel 4.4.0-4.
  --- 
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  pranith    1360 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 16.04
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 002: ID 0c45:6713 Microdia 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. XPS 15 9550
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-11-generic.efi.signed root=UUID=a16c8d99-e1e9-47d7-8873-d3e2800eee71 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-11.26-generic 4.4.4
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-11-generic N/A
   linux-backports-modules-4.4.0-11-generic  N/A
   linux-firmware                            1.156
  RfKill:
   1: phy1: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  Tags:  xenial
  Uname: Linux 4.4.0-11-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 12/18/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 01.01.15
  dmi.board.name: 0WNFM0
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr01.01.15:bd12/18/2015:svnDellInc.:pnXPS159550:pvr:rvnDellInc.:rn0WNFM0:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 15 9550
  dmi.sys.vendor: Dell Inc.

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