[Bug 108048] Screen flickering till it goes blank (console login, no X)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108048

--- Comment #6 from Sten Heinze <sten.heinze at gmx.de> ---
Over the last couple weeks I tried to bisect this problem (unfortunately a Core
M is quite slow in compiling), but I could not reproduce the bug with any of
the 14 kernels I compiled.

In looking at every detail again, I noticed that I used Debian's 4.16 config
for all kernels except the 4.17 to reproduce the bug.

So I started the bisect again and compiled the first bisecting step twice, once
with Debian's 4.16 and once with Debian's 4.17 config as starting point. (Then
I removed Debian's signing key, and ran make olddefconfig.) And the different
config causes the bug. I'll attach the diff. 

I'm not aware of an automated method to bisect configs. The most suspect config
setting to me is CONFIG_SATA_MOBILE_LPM_POLICY, but I'm just guessing.

I'd be happy to hear suggestions of how to make this more automated, and/or
which config setting to prioritize in testing.

(Also, even with a working kernel as far as this bug goes, I see "cpu pipe a
fifo underrun" messages and flicker on shutdown - but maybe this should go in a
different bug report?)

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