*** This bug is a duplicate of bug 1626935 ***
https://bugs.launchpad.net/bugs/1626935
Thank you for taking the time to report this bug and helping to make
Ubuntu better. This particular bug has already been reported and is a
duplicate of bug 1626935, so it is being marked as such. Please look at
the other bug report to see if there is any missing information that you
can provide, or to see if there is a workaround for the bug.
Additionally, any further discussion regarding the bug should occur in
the other report. Feel free to continue to report any other bugs you may
find.
** This bug has been marked a duplicate of bug 1626935
[yakkety] desktop is black and/or flickering after plugging in a second
monitor
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1636486
Title:
External screen flickers (esp. in terminals) with xorg modesetting
driver on Intel Broadwell
Status in xorg-server package in Ubuntu:
New
Bug description:
Hi,
I'm using a Dell XPS 13 (9343 // i7-5600U broadwell, 3200x1800 panel)
laptop, directly attached to an external Dell P2715Q 4K (3840x2160
@60Hz) via DP.
The 4K external screen is flickering when doing light activity --
easily reproduced when using an X terminal.
Steps to reproduce:
- open side by side Firefox (or Chrome) + a terminal and/or a gvim window on
the external 4K screen
- do some light web browsing
- give focus to the X terminal or gvim
// at this point, display is still perfectly steady
- press a key to enter a single character
// as soon as the key is pressed, external screen goes black for a few
seconds. Laptop screen is not affected.
- Wait for the screen to come back, then continue typing
// screen generally stays ON, but sometimes continues to flicker a few
times in next minute.
This happens almost every time I switch to the terminal window and
start typing.
OS specs:
- Ubuntu 16.10 running Unity, modesetting Xorg driver
- kernel 4.8.0. Issue is still present with 4.9.0rc1.
The intel driver (cp /usr/share/doc/xserver-xorg-video-intel/xorg.conf
/etc/X11) doesn't exhibit this issue.
Also reported upstream: https://bugs.freedesktop.org/show_bug.cgi?id=97264
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