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[Alexander Adam <1310745@xxxxxxxxxxxxxxxxxx>]

I have to correct myself.

"I have to launch an application first otherwise the resolution falls back down to 1920." <<< that is not correct:
the issue seems also to be time related. If I wait after logging in the resolution will be more probable accepted.

Additionally some applications seem to make it impossible to get the
higher resolution (for example HipChat). On the start the resolution
will fall back immediately and it is impossible to increase it as long
as the application is open.

On applications like eog or the ubuntu system settings, the resolution
will also fallback to the lower, but after execution the xrandr-commands
again, the resolution will be accepted by the system.

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https://bugs.launchpad.net/bugs/1310745

Title:
  keep custom resolutions

Status in “unity-settings-daemon” package in Ubuntu:
  New

Bug description:
  I work with an ASUS Zenbook UX31A and put it on the Dell monitor
  U2711. The Zenbook has HDMI output.

  While the monitor supports 2560x1600 there is always just max 1920x1080 selectable due to wrong EDID-informations (I am not entirely sure about the cause anymore).
  That wasn't a (big) problem for me, until now, while the ubuntu wiki describes how to add undetected resolutions ( https://wiki.ubuntu.com/X/Config/Resolution#Adding_undetected_resolutions ).

  When I attached the Dell monitor I just executed a shell script which
  adds the modes as described in the wiki.

  Now I updated to Ubuntu 14.04 LTS which changed the game:
  When I start Unity, I have to launch an application first otherwise the resolution falls back down to 1920.
  When I have the 2560-resolution and I open the ubuntu settings, the resolution falls back again.
  When I start the image viewer (eog), the resolution falls back again.

  This is really annoying and it would be great if there would be a
  solution.

  PS: this where the lines I used (I got them from a forum)

  xrandr --newmode "2560x1440_35.00" 173.58 2560 2696 2968 3376 1440 1441 1444 1469 -HSync +Vsync
  xrandr --addmode HDMI1 "2560x1440_35.00"
  xrandr --output HDMI1 --mode "2560x1440_35" --output eDP1 --off

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