[Bug 27001] [RV740] KMS fails with HD4770 + DELL3007WFP-HC

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27001

--- Comment #15 from Adam Hill <sidepipeuk at yahoo.co.uk> 2010-04-14 01:07:01 PDT ---
Not sure that I made it clear in my comments, but I'm using a completely
different card ( HD4350 ) and so the glaring commonality was the monitor.

Just to prove it, I've just dug out a different monitor - this one is a Dell
IN2010N at 1600x900... lo and behold this monitor works with KMS enabled. So I
can't say for sure because I know nothing about the code, but "something to do
with dual link DVI" would seem to be the most likely conclusion!

One other thing that I've noticed... at 2560x1600 on the 30 inch ( obviously
with UMS ) I get really bad screen corruption in pretty much all apps.
Scrolling pages seems to result in the bitmap not matching what was on screen
previously, and so when you move the mouse over parts of the scrolled window it
becomes obvious that what you see isn't what X actually thinks is there. Also,
the KMail icon menu just completely corrupts after a ( short ) while, and again
moving the mouse over it brings back the icons as they animate for the mouse
over action. I realise that this may be a completely different bug, but I
mention it because with the 1600x900 monitor and KMS it seems to not be
happening...

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