[Bug 101602] [KBL] MST monitors not detected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101602

--- Comment #7 from Rudi Chiarito <nutello at sweetness.com> ---
I just tried with 4.15.0-994-generic #201801050316. Still nothing.

Whenever I plug the USBC-DP cable, this shows up in the logs:

Jan 09 10:59:32 domo kernel: ACPI Error: [SPRT] Namespace lookup failure,
AE_ALREADY_EXISTS (20170831/dswload2-346)
Jan 09 10:59:32 domo kernel: No Local Variables are initialized for Method
[XTBT]
Jan 09 10:59:32 domo kernel: Initialized Arguments for Method [XTBT]:  (2
arguments defined for method invocation)
Jan 09 10:59:32 domo kernel:   Arg0:   000000003ba0dc24 <Obj>           Integer
0000000000000001
Jan 09 10:59:32 domo kernel:   Arg1:   00000000f74122ac <Obj>           Integer
0000000002060002
Jan 09 10:59:32 domo kernel: ACPI Exception: AE_ALREADY_EXISTS, During name
lookup/catalog (20170831/psobject-252)
Jan 09 10:59:32 domo kernel: ACPI Error: Method parse/execution failed
\_GPE.XTBT, AE_ALREADY_EXISTS (20170831/psparse-550)
Jan 09 10:59:32 domo kernel: ACPI Error: Method parse/execution failed
\_GPE.XTBT, AE_ALREADY_EXISTS (20170831/psparse-550)
Jan 09 10:59:32 domo kernel: ACPI Error: Method parse/execution failed
\_GPE._E42, AE_ALREADY_EXISTS (20170831/psparse-550)
Jan 09 10:59:32 domo kernel: ACPI Exception: AE_ALREADY_EXISTS, while
evaluating GPE method [_E42] (20170831/evgpe-646)
Jan 09 10:59:32 domo kernel: pcieport 0000:00:1c.0: AER: Corrected error
received: id=00e0
Jan 09 10:59:32 domo kernel: pcieport 0000:00:1c.0: PCIe Bus Error:
severity=Corrected, type=Physical Layer, id=00e0(Receiver ID)
Jan 09 10:59:32 domo kernel: pcieport 0000:00:1c.0:   device [8086:9d10] error
status/mask=00002001/00002000
Jan 09 10:59:32 domo kernel: pcieport 0000:00:1c.0:    [ 0] Receiver Error     
   (First)

The Gnome preferences don't show any monitors as plugged in. If I go to the
monitor's controls and switch the input from DP (the right port) to mDP
(empty!), the monitor gets detected and is available to be set up on the Linux
side, but of course no image will appear.

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