Alex Deucher wrote:
On Fri, Feb 19, 2010 at 10:57 PM, Dave Witbrodt <[email protected]> wrote:
[...]
I tried a week ago, and when I got black screens I gave up too quickly
and pulled the HD 5750, replacing it with my slightly older HD 4850.
This time I also got a black screen, but (as before) Windows Vista works
perfectly, so I know the hardware is not defective.
As it turns out, I use a KVM device that allows me to switch between 4
machines using Dsub VGA connectors. There are no VGA connectors on this
HD 5750, so I was using a DVI-to-Dsub converter that came with the card
so I could continue to switch between machines. After logging in via
SSH, and making sure I saved 'dmesg' and 'Xorg.0.log', I thought about
that converter possibly messing up the situation.
I turned the monitor off, plugged in a DVI cable, and rebooted. Voila!
Working KMS! No acceleration, of course, but I'm just glad to see the
ball toward open source Evergreen support starting to roll! Switching
between X and VT works fine, as well. And (unlike last week) I am
getting the proper 1920x1200 resolution for my monitor.
KVMs are always trouble. If you use one, your best bet is to force an
X configuration via config file as they often prevent the driver from
detecting any outputs. The UMS driver lights up one of the ports if
nothing is detected, you just happened to get lucky that it lit up the
right port for you, with KMS, we don't.
My KVM worked fine with KMS + HD 4850. There must be features missing
in the Evergreen KMS compared to the support for earlier devices.
At any rate, using DVI instead of Dsub cured my black screen issues. I
still use the KVM, but have to manually switch the monitor between Dsub
and DVI.
Thanks,
Dave W.
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