[Bug 91393] [bdw edp] Screen Flickering

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91393

--- Comment #45 from Tom Furniss <furniss.tom at gmail.com> ---
Just wanted to summarise the progress against the original problem, which may
or may not be related to some of these other issues, and to add some test
detail.

The original problem was a continually flickering screen, starting part-way
through boot and prior to the login screen, and affected the extended display
port of the laptop screen only, not external monitors.

Mika's original patch fixed this issue, removing the flicker, but during QA
Mika was asked to modify it to remove kernel parameters.  Mika's revised
(second) patch also resolved the issue.

With both of Mika's patches there were still some graphics issues:
1) Initial blank screen on boot.
2) Occasional blinking of the graphics, ranging from every few seconds to every
2-3 minutes.  The blink lasted only a fraction of a second, and whilst
noticeable it wasn't a major concern.
3) The flickering returned when resuming from sleep.

Issue 1 was a relatively common brightness issue, and was resolved by using
kernel parameter acpi_osi=linux, and running this command automatically on
startup, "setpci -s 00:02.0 F4.B=00".  This also resolved issue 2, removing the
occasional blink.

Issue 3 remains.

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