Update:
This fault was tracked down to a damaged display port cable. Some of the
pins in one of the connectors were bent so badly that I have no idea how
it was functioning. A replacement resurrected the affected display.
I can only conclude that there must have been some extra status checking
code in one of the updates which introduced a test on the faulty lines.
The test returned an erroneous result and triggered the driver to issue
an "enter power save" command to that monitor.
This bug can be closed - and I can stop attempting to bisect the Xorg
code..
** Changed in: xorg (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1654772
Title:
Lost one screen from triple multi monitor radeon setup.
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