[Bug 90340] RADEON "PITCAIRN" displayport output breaks when monitor turned off and on

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90340

--- Comment #4 from Niels Ole Salscheider <niels_ole at salscheider-online.de> ---
I observed the following behaviour with my setup:
- the monitor never comes back on again under memtest86+ or in the BIOS
- it always comes back on again when on the console (with the raden driver
loaded at least)
- it sometimes (?) comes back on under X
- if it does not come back on, something like switching to the console, power
cycle, switching to X, switching to the console brings it back on the console,
but it will turn off as soon as you switch to X. Switching to the console again
turns it on, etc.

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