[Bug 112376] New: ThinkPad X1 Extreme 2nd Generation does not advertise DPCD backlight in vbios
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Fri Nov 22 21:18:05 UTC 2019
https://bugs.freedesktop.org/show_bug.cgi?id=112376
Bug ID: 112376
Summary: ThinkPad X1 Extreme 2nd Generation does not advertise
DPCD backlight in vbios
Product: DRI
Version: DRI git
Hardware: Other
OS: All
Status: NEW
Severity: not set
Priority: not set
Component: DRM/Intel
Assignee: intel-gfx-bugs at lists.freedesktop.org
Reporter: lyude at redhat.com
QA Contact: intel-gfx-bugs at lists.freedesktop.org
CC: intel-gfx-bugs at lists.freedesktop.org
Created attachment 146015
--> https://bugs.freedesktop.org/attachment.cgi?id=146015&action=edit
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
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