External screen flickers (esp. in terminals) with xorg modesetting driver on Intel Broadwell
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Linux |
Fix Released
|
Medium
|
|||
linux (Ubuntu) |
Triaged
|
Medium
|
Unassigned |
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/
Also reported upstream: https:/
Changed in linux: | |
importance: | Unknown → Medium |
status: | Unknown → Confirmed |
Changed in linux (Ubuntu): | |
importance: | Undecided → Medium |
status: | Confirmed → Triaged |
Changed in linux: | |
status: | Confirmed → Incomplete |
Changed in linux: | |
status: | Incomplete → Fix Released |
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.