[Bug 107731] radeon (amdgpu) DisplayPort loss of max-resolution on DP monitor (after monitor power saving / idle)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107731

--- Comment #7 from L.S.S. <ragnaros39216 at yandex.com> ---
Unfortunately I cannot test this on my monitor (Lenovo ThinkVision P27). While
it only has options for DP or HDMI input (no Auto select), it seems to actively
cycle through the input signals when powering on, resuming from idle, or when
there's no signal on either input.

The monitor in question doesn't appear to maintain the inactive link (as well
as USB connection) when powering off, going idle, or switching input, from what
I could find out. Before using a KVM (that I'm swapping between its HDMI and DP
inputs that were connected to different places), whenever I switch the active
signal, the built-in USB hub power-cycles (devices disconnect then reconnect),
and the monitor becomes disconnected to the system connected to the now
inactive signal.

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