Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: xorg-server (Ubuntu)
Status: New => Confirmed
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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:
Confirmed
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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