[Bug 32316] Severe glitches with KMS + external monitor

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri Dec 17 09:11:01 PST 2010


--- Comment #11 from tim.holy at gmail.com 2010-12-17 09:11:01 PST ---
> Right, the glitches are bandwidth related, the memory controller is having
> trouble keeping up with all the requests so you end up with underflow to the
> VGA port.  Either there's a problem with the display watermarks (which
> shouldn't be a factor with disp_priority set to 2), or the bandwidth requests
> are too much for the asic to keep up with.

Just to make sure I'm being clear: I also don't have a problem with high
resolution if I'm using UMS. It's only with KMS that it's a problem. I don't
know enough to judge whether the bandwidth demands would be expected to be
higher under KMS than UMS.

> You might try a lower color depth. 
> You might also try:
> Option "EXAPixmaps" "off"
> in the device section of your xorg.conf

I will try these tomorrow morning. Thanks for your suggestions.

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