[Bug 91614] New: DVI display on DisplayPort-MST behind DP-DVI converter gets no EDID
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Wed Aug 12 00:50:01 PDT 2015
https://bugs.freedesktop.org/show_bug.cgi?id=91614
Bug ID: 91614
Summary: DVI display on DisplayPort-MST behind DP-DVI converter
gets no EDID
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: cweiske at cweiske.de
QA Contact: intel-gfx-bugs at lists.freedesktop.org
CC: intel-gfx-bugs at lists.freedesktop.org
Created attachment 117641
--> https://bugs.freedesktop.org/attachment.cgi?id=117641&action=edit
dmesg with drm.debug=14
My setup: Thinkpad T440p with an Ultra Dock, two identical displays connected
to the dock. DP2-1 connected via a DP-DVI converter to the docks' display port
socket, DP2-2 connected directly to the dock's DVI port.
DP2-1 gets the wrong resolution; "xrandr --verbose" shows that no EDID data are
available. I can manually add the correct resolution with "xrandr --addmode",
which makes the display work on the correct resolution.
I can swap the displays physically, and the one connected to the DVI port
always gets the correct resolution - so it is not a display issue.
I connected the display via a MiniDP-DVI adapter directly to the laptop
(bypassing the docking station) and it got the correct resolution.
Attached is dmesg output with drm.debug=14
Xorg server: 1:7.7+1ubuntu8.1
xf86-video-intel: git 2015-07-31 17:17,
bc063c9f4af90542297877281b1b9f4692dafde4
Linux kernel: Linux csystems 4.1.4-dp-mst #1 SMP Fri Aug 7 09:25:36 CEST 2015
x86_64 x86_64 x86_64 GNU/Linux
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