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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Regression] Horizontal lines on Samsung NP900X3G"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106943">106943</a>
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<th>Summary</th>
<td>[Regression] Horizontal lines on Samsung NP900X3G
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (All)
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>frank@winklmeier.name
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=140186" name="attach_140186" title="Horizontal black lines">attachment 140186</a> <a href="attachment.cgi?id=140186&action=edit" title="Horizontal black lines">[details]</a></span>
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 (<a href="https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1773581">https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1773581</a>)
after upgrading from 4.13.0-41 to 4.13.0-43 and by another user on a NP900X3F
running Ubuntu 18.04
(<a href="https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1771204">https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1771204</a>).
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:
<a href="https://cgit.freedesktop.org/drm-tip/commit/drivers/gpu/drm/i915?id=368b554d63948133aca05e63ff8f5f4fbc2804d4">https://cgit.freedesktop.org/drm-tip/commit/drivers/gpu/drm/i915?id=368b554d63948133aca05e63ff8f5f4fbc2804d4</a>
Could the relevant fixes be included int the mainline kernel? I expect this to
affect everybody with a Samsung NP900X3F/G laptop.</pre>
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