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Message #84186
[Bug 1104230] Re: DisplayPort 1.2 MST support is missing in the Intel driver
One final thing: the display that is on is consistent. When I logged out
of my normal window manager (awesome) and switched to Unity, the yellow
monitor turned on and the green one turned off. Even after logging back
into awesome, this state persisted.
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https://bugs.launchpad.net/bugs/1104230
Title:
DisplayPort 1.2 MST support is missing in the Intel driver
Status in X.org xf86-video-intel:
Unknown
Status in “xserver-xorg-video-intel” package in Ubuntu:
Confirmed
Bug description:
SRU Justification:
Impact: Many users expect the possibility to use the DP1.2 MST feature which
enables them to use a number of different display setups: daisy-chaining
DP1.2 displays, some 4K displays appearing as 2 separate displays, 3D displays.
This however is not supported in Ubuntu stable kernel.
Fix: A series of 18 cherry-picks from v3.17 kernel backported to v3.16 by
the original author of the feature: David Airlie.
Regression Potential: These patches were merged upstream in v3.17 without any
reported regressions.
Original description:
I have two recent DisplayPort monitors, both supporting the 1.2
version of the standard and one containing an MST hub (DELL 2913WM).
I have an Intel Haswell based NUC connected over mini-displayport to
the display containing the hub, then the second display is plugged in
that one over DisplayPort.
DisplayPort 1.2 is enabled on the display containing the hub and the
second display lights up fine but just works as a clone of the first
display, without ever showing up in xrandr, dmesg or any other useful
logs I could find.
My understanding of MST is that the second display should show up as
DP2 on my laptop so I can configure it as I would any other display.
UPDATE: Updated the bug report after it was pointed out that the
original test hardware, a Lenovo x230 isn't DP 1.2 capable. The same
test on hardware also fails, due to missing support for MST in the
driver.
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