kernel-packages team mailing list archive

[Eamon Nerbonne <emn13+launchpad@xxxxxxxxxxxx>]

** Attachment added: "Xorg.0.log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311476/+attachment/4093690/+files/Xorg.0.log

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1311476

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

Status in “linux” package in Ubuntu:
  New

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311476/+subscriptions