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

[bugzilla-daemon at freedesktop.org]

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

            Bug ID: 106943
           Summary: [Regression] Horizontal lines on Samsung NP900X3G
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: frank at winklmeier.name
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 140186
  --> https://bugs.freedesktop.org/attachment.cgi?id=140186&action=edit
Horizontal black lines

I was asked to open this bug report by the Ubuntu maintainers. The current
mainline kernel shows horizontal black lines on the builtin display of a
Samsung NP900X3G laptop (see attached photo). The problem was first seen on
Ubuntu 16.04 (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1773581)
after upgrading from 4.13.0-41 to 4.13.0-43 and by another user on a NP900X3F
running Ubuntu 18.04
(https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1771204).

It is reproducible with the latest mainline kernel:
Linux winki 4.17.2-041702-generic #201806160433 SMP Sat Jun 16 08:35:37 UTC
2018 x86_64 x86_64 x86_64 GNU/Linux

The problem is fixed in drm-tip:
Linux winki 4.17.0-994-generic #201806152200 SMP Sat Jun 16 02:03:28 UTC 2018
x86_64 x86_64 x86_64 GNU/Linux

For the Ubuntu 4.13.0-43 kernel, the problem is fixed after reverting the
following 4 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"

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.

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