[Bug 111045] [CI][BAT] igt at kms_chamelium@(hdmi|dp)-hpd-fast|igt at kms_chamelium@dp-edid-change-during-suspend - fail - Failed assertion: igt_hotplug_detected(mon, HOTPLUG_TIMEOUT)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111045

--- Comment #22 from emersion <contact at emersion.fr> ---
(In reply to Imre Deak from comment #15)
> If unplugging a DP-alt display while there is an active modeset on it, and
> then replugging the DP-alt display, the HW/FW/driver won't signal the
> corresponding plug-in hotplug event until the mode is disabled.

Hmm, I see.

> The failing tests do this:
> 
> - <have the output enabled>
> - unplug the display, keeping the output enabled
> - wait/poll for the disconnect status -> success
> - replug the display, while the output is still enabled
> - wait/poll for the connect status -> fail
> 
> This sequence is not supported with DP-alt sinks (like the USB-C to HDMI
> dongle), as I described above. 

Thanks for the explanation!

> If there wouldn't be any mode enabled for the whole duration of the
> sequence, or the client would enable/disable the mode according to the
> output's connected/disconnected status, then all the hotplug uevents,
> polling would work as the test expects.

I'll try to send a patch to do this.

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