[Bug 104054] [SKL][DP] HP Lap Dock external display with DisplayPort over USB Type-C input not properly detected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104054

--- Comment #40 from Rodrigo Vivi <rodrigo.vivi at gmail.com> ---

One thing that is strange is that it seems that there is a hotplug in the
middle of modeset that is working correctly. Link train happens etc, but the is
a point with another hotplug.

Anyway,

Could you please use intel gpu tool to check
$ sudo intel_reg read 0xc2014

also it is good:
$ sudo intel_reg dump

and also please

$ sudo cat /sys/kernel/debug/dri/0/i915_display_info


-----

There is another thing really strange on the log.

At first sight I thought a PSR related message along to DP-1 was just a
pollution on our log, than when I was going to only print PSR msg if eDP I
noticed that our flow is already protected so this PSR related message
shouldn't be here:

Aug 26 11:30:38 latitude-7275 kernel: [   27.817517] [drm:intel_atomic_check
[i915]] [CONNECTOR:78:DP-1] checking for sink bpp constrains
Aug 26 11:30:38 latitude-7275 kernel: [   27.817633] [drm:intel_atomic_check
[i915]] clamping display bpp (was 36) to EDID reported max of 24
Aug 26 11:30:38 latitude-7275 kernel: [   27.817749]
[drm:intel_dp_compute_config [i915]] DP link computation with max lane count 1
max rate 540000 max bpp 24 pixel clock 148500KHz
Aug 26 11:30:38 latitude-7275 kernel: [   27.817851]
[drm:intel_dp_compute_config [i915]] DP lane count 1 clock 540000 bpp 24
Aug 26 11:30:38 latitude-7275 kernel: [   27.817958]
[drm:intel_dp_compute_config [i915]] DP link rate required 445500 available
540000
Aug 26 11:30:38 latitude-7275 kernel: [   27.818056]
[drm:intel_dp_compute_config [i915]] PSR disable by flag

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