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[Eamon Nerbonne <emn13+launchpad@xxxxxxxxxxxx>]

apport information

** Attachment added: "ProcInterrupts.txt"
   https://bugs.launchpad.net/bugs/1311476/+attachment/4093717/+files/ProcInterrupts.txt

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https://bugs.launchpad.net/bugs/1311476

Title:
  Upgrade to Trusty breaks 2560x1440 over DVI on intel haswell

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  After upgrading to Trusty, my Dell U2711 won't run at its native
  2560x1440.  Instead, resolution is limited to 1920x1200.

  However, if I connect this monitor via displayport, it works fine; it
  also worked fine in 13.10.

  Some weird things: apparently, the driver thinks the DVI port is
  actually an HDMI port.  I found bugs #859389 (old), #890088 (mint,
  nvidia not intel), and #980453 (also nvidia, also old) which also
  refer to false recognition as an HDMI port.

  I found a thread (in german)
  http://forum.ubuntuusers.de/topic/2560x1440-funktioniert-ploetzlich-
  nicht-mehr-d/ which sounds exactly like my problem.

  Attempting to force the resolution with xrandr didn't work (and
  resulted in some odd errors I can't interpret), but using the results
  of "gtf 2560 1440 30.0" (i.e. 30fps not 60) at least temporarily
  worked, but the display (predictably) looks pretty laggy.

  I'm not sure what graphics driver is running (though I'm pretty sure it's the default for haswell) nor how to tell, but I'll reboot and generate a clean(ish) Xorg log and attach that.
  --- 
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  eamon      4063 F.... pulseaudio
   /dev/snd/pcmC1D0p:   eamon      4063 F...m pulseaudio
   /dev/snd/controlC0:  eamon      4063 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=5b655402-10fe-491b-9452-910059fc3419
  InstallationDate: Installed on 2013-10-28 (176 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  NonfreeKernelModules: wl
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  Tags:  trusty
  Uname: Linux 3.13.0-24-generic x86_64
  UpgradeStatus: Upgraded to trusty on 2014-04-22 (0 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 10/04/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P2.10
  dmi.board.name: Z87E-ITX
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP2.10:bd10/04/2013:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnZ87E-ITX:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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