[Bug 97264] Screen blanking (DP link reset?) when working in terminals

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97264

--- Comment #2 from cedric at maion.com <cedric at maion.com> ---
Hi there,

I'm having the exact same issue with 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 indeed 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.

Tried i915.enable_psr=0|2|3 and i915.enable_rc6=0, doesn't solve the issue.

dmesg output shows the following message right after boot:
[drm:gen8_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are the assignee for the bug.
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20161025/3628af1b/attachment-0001.html>