[Bug 35894] Displaying across 3 monitors with max resolution causes one monitor to enter power-saving mode (HD6870)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=35894

--- Comment #1 from woogie at gmail.com 2011-04-03 09:04:24 PDT ---
I've experimented further with RandR, and I've found some additional
information:

A configuration of 1680x1050,inactive,1680x1050 does function correctly.

At boot, with KMS enabled, two of my three displays are active when the radeon
module loads: DisplayPort-1 and one of the two DVI displays.

If I use ctrl+alt+f1 to switch back to a console when I have my display
configured to use DVI-1 and DVI-0, one of the DVI displays will enter power
saving mode and DisplayPort-1 will turn back on. If I then use ctrl+alt+f7 to
re-enter my desktop, DisplayPort-1 turns off leaving only one of the two DVI
displays enabled.

I'm also having trouble coming up with consistent use cases, as behaviour is
not consistent. For example, I have tried configuring
1280x1024,1280x1024,1280x1024 for my displays, and have received inconsistent
results; sometimes all displays function, other times I have had one of the
three displays (including DisplayPort-1) enter power-saving mode.

UPDATE:

DisplayPort-1 is actually a U2211H, not UV22H

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