[Bug 81476] three monitors on two radeon cards works with some layouts not others

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81476

--- Comment #19 from Ian! D. Allen <idallen at idallen.ca> ---
(In reply to comment #18)
> if all three of your monitors are identical use the same modeline and
> pixel clock, you'd only need one PLL so you should be fine.

Yes: Three identical 1600x1200.  I just have to find an available card that can
handle three DVI connectors, ideally without having to buy an active adapter. 
(Sapphire makes a "Flex" card that claims to do this; my initial attempts to
find one to buy have turned up nothing useful.)

> TBH, I think it's a hw limitation on r5xx hardware that's not properly handled.

I'd believe it as a hardware limitation if inverting the first two monitors
didn't fix it.  If I were willing to physically turn my first two monitors
upside-down, it would work fine with the given hardware.  The hardware can
display across my three monitors at 4800x1200 as long as two of the screens are
inverted.  We just need to make the software put those screens into the
hardware the other way up!

Thanks for your comments.

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