[Bug 100302] [GLK] Fifo underrun when changing resolution

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100302

--- Comment #4 from Ander Conselvan de Oliveira <conselvan2 at gmail.com> ---
I still haven't found the root cause for this, but I was enable to narrow it
down further:

- The underrun only happens with eDP because it is triggered by using the pipe
scaler. If I force HDMI to use panel fitting, the underrun is also triggered.

- The underrun happens only the first time the scaler is used. After reverting
to the panel native resolution, a subsequent modeset won't trigger the underrun
again. However, the underrun can be triggered once after a suspend/resume
cycle.

- Using the scaler to scale a plane before the modeset that triggers the scaler
usage by the pipe will also prevent the underrun.

-- 
You are receiving this mail because:
You are the QA Contact 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/20170404/3574b091/attachment.html>