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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - i195: modesetting stops working on kernel 4.17, works fine on 4.16"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106804">106804</a>
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<th>Summary</th>
<td>i195: modesetting stops working on kernel 4.17, works fine on 4.16
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>XOrg git
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>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
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<th>Reporter</th>
<td>arekm@maven.pl
</td>
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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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<p>
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<pre>Created <span class=""><a href="attachment.cgi?id=140000" name="attach_140000" title="xorg log">attachment 140000</a> <a href="attachment.cgi?id=140000&action=edit" title="xorg log">[details]</a></span>
xorg log
xserver 1.20, kernel 4.17 and modesetting fails:
[ 126.170] (EE) modeset(0): failed to set mode: Invalid argument
while it works fine on 4.16 kernel.
Bisected to commit below and indeed, reverting it on current
kernel git makes the problem go away.
commit e995ca0b8139c5f6807095464e969931b443f55a
Author: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>>
Date: Tue Nov 14 20:32:58 2017 +0200
drm/i915: Provide a device level .mode_valid() hook
We never support certain mode flags etc. Reject those early on in the
mode_config.mode_valid() hook. That allows us to remove some duplicated
checks from the connector .mode_valid() hooks, and it guarantees that
we never see those flags even from user mode as the
mode_config.mode_valid() hooks gets executed for those as well.
Signed-off-by: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>>
Link:
<a href="https://patchwork.freedesktop.org/patch/msgid/20171114183258.16976-11-ville.syrjala@linux.intel.com">https://patchwork.freedesktop.org/patch/msgid/20171114183258.16976-11-ville.syrjala@linux.intel.com</a>
Reviewed-by: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>></pre>
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