[Bug 99384] [HSW] One of two displays not detected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99384

--- Comment #5 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Something fishy with MST.

[   48.701444] [drm:drm_dp_send_link_address] link address reply: 3
[   48.701446] [drm:drm_dp_send_link_address] port 0: input 1, pdt: 1, pn: 0,
dpcd_rev: 00, mcs: 1, ddps: 1, ldps 0, sdp 0/0
[   48.701447] [drm:drm_dp_send_link_address] port 1: input 0, pdt: 3, pn: 8,
dpcd_rev: 12, mcs: 0, ddps: 1, ldps 0, sdp 1/2
[   48.701448] [drm:drm_dp_send_link_address] port 2: input 0, pdt: 0, pn: 1,
dpcd_rev: 00, mcs: 0, ddps: 0, ldps 0, sdp 0/0

So port 1 looks all correct. It claims to have a peer device type of SST sink
or stream sink. the logical port numbers looks fine, and the "display device
plug status" is 1 and it reports it can handle some streams. We seem to be
registering the connector for it, but then we're somehow unable to detect it. I
don't really see why that would happen.

I think someone needs to expand the MST code debug output to make any sense of
this. Also the current debug messages seem rather useless without having the
spec at hand. So someone might want to improve them as well.

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