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Message #77043
[Bug 1104230] Re: DisplayPort 1.2 MST support is missing in the Intel driver
Thanks Vincent. This confirm that probably what I have backported is not
enough to have full MST support. I will try to prepare an updated build
after reviewing David Airlie tree.
I will work on providing an update next week.
Thank you all for testing.
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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:
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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