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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 - ThinkPad X1 Extreme 2nd Generation does not advertise DPCD backlight in vbios"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112376">112376</a>
</td>
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<th>Summary</th>
<td>ThinkPad X1 Extreme 2nd Generation does not advertise DPCD backlight in vbios
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>DRI git
</td>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>not set
</td>
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<th>Priority</th>
<td>not set
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>lyude@redhat.com
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=146015" name="attach_146015" title="VBIOS">attachment 146015</a> <a href="attachment.cgi?id=146015&action=edit" title="VBIOS">[details]</a></span>
VBIOS
Filing this at the request of some of the Intel folks. I recently got my hand
on a ThinkPad X1 Extreme 2nd Generation with the optional 4K AMOLED screen, and
discovered that backlight controls weren't working. While there seems to be
multiple problems here, all of which I've come up with some patches for that I
plan to send out after filing this bug, one of the big things I noticed was
that despite requiring DPCD backlight control this laptop claims to be using
PWM backlight controls in it's vbios. So, I'm filing this bug to upload the
vbios along with DPCD and other relevant information here.
As well, here's a dump of some relevant DPCD registers:
[ 3.142168] [drm:intel_dp_read_dpcd [i915]] DPCD: 14 14 c4 01 00 00 01 c0 02
14 00 00 00 08 82
[ 3.142600] [drm:drm_dp_read_desc [drm_kms_helper]] DP sink: OUI ba-41-59
dev-ID HW-rev 0.0 SW-rev 0.0 quirks 0x0000
[ 3.143012] [drm:intel_dp_init_connector [i915]] eDP DPCD: 05 9d a6
If you need any more information just let me know and I'll be happy to uplaod
it</pre>
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