[Bug 106943] [Regression] Horizontal lines on Samsung NP900X3G

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106943

--- Comment #2 from Frank Winklmeier <frank at winklmeier.name> ---
(In reply to Jani Nikula from comment #1)

> Does the Ubuntu kernel have backports of this stuff that you have to revert?

Yes, it seems they backport some of this. E.g.:

http://kernel.ubuntu.com/git/ubuntu/ubuntu-xenial.git/log/?h=hwe&qt=grep&q=training

> I'm wondering what the relevant fixes would be in this case. Is 368b554d6394
> ("Revert "drm/i915/edp: Allow alternate fixed mode for eDP if available."")
> enough alone on v4.17 release to fix it for you?

The situation seems a bit more complicated. From my tests on the 4.13 kernel, I
had to revert all of the following four commits:

fd18173 Revert "drm/i915/edp: Allow alternate fixed mode for eDP if available."
4fb94d0 Revert "drm/i915/dp: rename intel_dp_is_edp to intel_dp_is_port_edp"
7547d0c Revert "drm/i915/dp: make is_edp non-static and rename to
intel_dp_is_edp"
cb6c81f Revert "drm/i915/edp: Do not do link training fallback or prune modes
on EDP"

Only reverting the first one did not help (I assume the 2nd and 3rd commit only
affect code quality and don't matter here). Looking again at drm-tip I see that
"Allow alternate fixed mode..." has been indeed reverted but the "link
training" commit is still present. Since I don't see the problem with drm-tip,
I assume some of the other changes that went in there (but not mainline) fixed
the regression?

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