this is a kernel bug
try newer mainline builds:
http://kernel.ubuntu.com/~kernel-ppa/mainline/
** Package changed: xserver-xorg-video-intel (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Importance: Medium => Low
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** Description changed:
Following on from https://answers.launchpad.net/ubuntu/+source/xserver-
xorg-video-intel/+question/270926
When I plug a Dell U3414W screen into my Dell XPS 13 9343 display port
the screen does not turn on when I enable it's native 3440 x 1440 in the
display set
Disabled DP 1.2 on my monitor and it started working for me too.
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https://bugs.launchpad.net/bugs/1494095
Title:
Dell U3414W screen not turning on in 3440 x 144
Tried another test. In the monitor settings menu under Display there is
a option called "DP 1.2", by default it is set to Enabled. If I set it
to Disabled I get the PIP behaviour - Ubuntu detects the correct native
resolution and the image appears.
If I set it back to Enabled the bug comes back.
I have noticed some interesting behaviour when I use the Picture in
Picture mode on the screen.
With PIP turned off, I get the above issue with no output at the native
resolution.
If I enable PIP mode with my Android phone plugged into the MHL port
Ubuntu redetects the screen - and sets the nativ
Leith Bade, thank you for reporting this and helping make Ubuntu better.
Any change via http://cdimage.ubuntu.com/daily-live/current/ ?
** Tags added: latest-bios-a05
** Changed in: xserver-xorg-video-intel (Ubuntu)
Importance: Undecided => Medium
** Changed in: xserver-xorg-video-intel (Ubun
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