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

[bugzilla-daemon at freedesktop.org]

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

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #1 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to Frank Winklmeier from comment #0)
> For the Ubuntu 4.13.0-43 kernel, the problem is fixed after reverting the
> following 4 commits:

I'm curious about the statement, because...

> fd18173 Revert "drm/i915/edp: Allow alternate fixed mode for eDP if
> available."

dc911f5bd8aa ("drm/i915/edp: Allow alternate fixed mode for eDP if available.")
was first introduced in v4.14.

> 4fb94d0 Revert "drm/i915/dp: rename intel_dp_is_edp to intel_dp_is_port_edp"

7b91bf7f9196 ("drm/i915/dp: rename intel_dp_is_edp to intel_dp_is_port_edp")
was first introduced in v4.15.

> 7547d0c Revert "drm/i915/dp: make is_edp non-static and rename to
> intel_dp_is_edp"

1853a9daa19e ("drm/i915/dp: make is_edp non-static and rename to
intel_dp_is_edp") was first introduced in v4.15.

> cb6c81f Revert "drm/i915/edp: Do not do link training fallback or prune
> modes on EDP"

a306343bcd7d ("drm/i915/edp: Do not do link training fallback or prune modes on
EDP") was first introduced in v4.16.

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

> which seems to be consistent with the following revert on drm-tip:
> https://cgit.freedesktop.org/drm-tip/commit/drivers/gpu/drm/
> i915?id=368b554d63948133aca05e63ff8f5f4fbc2804d4
> 
> Could the relevant fixes be included int the mainline kernel? I expect this
> to affect everybody with a Samsung NP900X3F/G laptop.

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?

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