[Bug 93578] [SKL] Intel HD 520 failed to train DP when connected with a external monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93578

--- Comment #100 from Mads <mads at ab3.no> ---
(In reply to Mads from comment #95)
> Tested DP MST with a fresh drm-tip today (commit
> 0a03ea9496b49746b4964d05cc1f483385d1df8a), and it seems like daisy chaining
> triggers the same kind of behaviour as with the DA200 dongle, so maybe the
> error is related.
> 
> When Daisy chaining two Dell U2715H monitors through DisplayPort, the last
> monitor in the chain cannot get a resolution higher than the range
> previously mentioned here (1024x768 works, 1600x1200 does not, 1920x1080
> does not).

It just dawned on me that I tested this through a Dell WD15 docking, maybe DP
MST works if you don't use that (maybe the WD15 got the same data link issue as
DA200).

I got a standard non-Dell USB-C to DP dongle that I know works with 4k @ 60Hz,
I can try if DP MST works with that on monday.

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