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[Bug 1517465] Re: Resolution too low on external monitor through Intel graphics, reversion in 4.x kernel


I was having a problem rather similar to this (although on different
hardware). I found that installing a 4.3.xx version kernel from the
mainline builds described above fixed the problem.

(Miraculously, I don't think it broke anything else either!)

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  Resolution too low on external monitor through Intel graphics,
  reversion in 4.x kernel

Status in linux package in Ubuntu:

Bug description:
  I have the incorrect resolution on my external monitor since upgrading
  to 15.10 with the 4.x kernel.

  Playing with xmode lines manually via xrandr has failed -- when I
  create a correct 1920x1080 modeline and force it, it is unable to

  Booting with the 3.19.0-26 kernel fixes the issue.

  The Machine in question is a Dell XPS 12. Video card: Intel 3rd Gen
  graphics controller.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
  Uname: Linux 4.2.0-18-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Wed Nov 18 07:58:53 2015
  DistUpgraded: 2015-11-06 06:09:04,179 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:0589]
  InstallationDate: Installed on 2014-11-08 (375 days ago)
  InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: Dell Inc. XPS 12 9Q23
   PATH=(custom, no user)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic.efi.signed root=UUID=31556373-7ffa-4f76-a0f4-0a770bb0f04f ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to wily on 2015-11-06 (12 days ago)
  dmi.bios.date: 08/01/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A08
  dmi.board.name: 0520M8
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A08
  dmi.modalias: dmi:bvnDellInc.:bvrA08:bd08/01/2013:svnDellInc.:pnXPS129Q23:pvrA08:rvnDellInc.:rn0520M8:rvrA00:cvnDellInc.:ct8:cvrA08:
  dmi.product.name: XPS 12 9Q23
  dmi.product.version: A08
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Wed Nov 18 07:57:09 2015
  xserver.configfile: default

  xserver.logfile: /var/log/Xorg.0.log
   product id                                 957
   vendor                                     LGD
  xserver.version: 2:1.17.2-1ubuntu9

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