[Bug 101111] [Regression BDW] backlight flickering/display artifacting on Broadwell integrated graphics with 4.12-rc1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101111

--- Comment #20 from Mark Spencer <n7u4722r35 at ynzlx.anonbox.net> ---
This patch forces my and similar systems to use panel type from OpRegion:

[drm] Using panel type from OpRegion on HP Spectre x360 Convertible


Actually that was you who proposed this:

(In reply to Jani Nikula from comment #5)
> Sorry for the delay. The fix would be adding the system to the quirk table
> to use opregion panel type on it.

This was pretty extensively discussed in
https://bugs.freedesktop.org/show_bug.cgi?id=97918

I have to say that I didn't opened this bug and I didn't called it regression.
I joined discussion because I saw your comment quoted above about fixing this
which is exactly what I proposed many months ago which is also the same what
Radhakrishna Sripada proposed in his patch (basing on my suggestion I guess).

Regression or not, this issue can be solved easily. If it's true that it
doesn't has any downsides I personally don't see reason for not doing it.

In reply to Radhakrishna Sripada from comment #15)
> can you do "echo 0x6 > /sys/module/drm/parameters/debug" and see if you   > are still observing FB logs?

It doesn't help. Logs are still spammy as hell.

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