* [Bug 94689] Two monitor DisplayPort MST DaisyChain (Second/Last Monitor In Chain Black Screen)
@ 2016-03-24 21:54 bugzilla-daemon
2019-11-19 9:13 ` bugzilla-daemon
0 siblings, 1 reply; 2+ messages in thread
From: bugzilla-daemon @ 2016-03-24 21:54 UTC (permalink / raw)
To: dri-devel
[-- Attachment #1.1: Type: text/plain, Size: 1950 bytes --]
https://bugs.freedesktop.org/show_bug.cgi?id=94689
Bug ID: 94689
Summary: Two monitor DisplayPort MST DaisyChain (Second/Last
Monitor In Chain Black Screen)
Product: DRI
Version: XOrg git
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: major
Priority: medium
Component: DRM/Radeon
Assignee: dri-devel@lists.freedesktop.org
Reporter: mike.ennen@gmail.com
As per our chat in #radeon (I am brcolow).
Here is the dmesg with dri.debug=6:
https://gist.github.com/brcolow/e27a5e46b175dd0966af
Here is /sys/kernel/debug/dri/0/radeon_mst_info contents:
mst: ffff88061cedfb40, 0
port: 1: ddps: 1 ldps: 0, sdp: 1/1, ffff8800bb193000, conn:
ffff880622b27000
port: 8: ddps: 1 ldps: 0, sdp: 1/1, ffff8800bb192800, conn:
ffff880622049000
port: 0: ddps: 1 ldps: 0, sdp: 0/0, ffff8800bb192000, conn:
(null)
vcpi: 7 3
vcpi 0: 8 1 22
vcpi 1: 1 2 22
vcpi 2:unsed
vcpi 3:unsed
vcpi 4:unsed
vcpi 5:unsed
payload 0: 2, 1, 22
payload 1: 2, 23, 22
payload 2: 0, 45, 0
payload 3: 0, 45, 0
payload 4: 0, 45, 0
payload 5: 0, 45, 0
dpcd: 12 14 c4 01 01 01 01 81 02 00 06 00 00 00 00
faux/mst: 00 01
mst ctrl: 07
branch oui: 00e04c devid: Dp1.2 revision: hw: 0.0 sw: 0.0
payload table: 07 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
01 01 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
attrib 0: 4 22
attrib 1: 2 22
The two monitors that are being daisy-chained are Dell UltraSharp U2715H's. GPU
is Radeon R9 290.
I have tried doing:
xrandr --output DisplayPort-0-1 --rate X
where X = 59.9, 60, 49.9, 50, 39.9, 40 etc but it doesn't seem to change
anything (and this is the extent of my debugging abilities).
--
You are receiving this mail because:
You are the assignee for the bug.
[-- Attachment #1.2: Type: text/html, Size: 3259 bytes --]
[-- Attachment #2: Type: text/plain, Size: 160 bytes --]
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2019-11-19 9:13 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-03-24 21:54 [Bug 94689] Two monitor DisplayPort MST DaisyChain (Second/Last Monitor In Chain Black Screen) bugzilla-daemon
2019-11-19 9:13 ` bugzilla-daemon
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.