Hi! Since upgrade to 10.04 I've been having stability problems with OSS ATI radeon driver and my video card (Gigabyte Radeon HD 4850). Driver crashed repeatedly leaving my video card disabled. So I installed fglrx driver today (fglrx 2:8.723.1-0ubuntu3). No more crashes (yet?) but 2D performance is simply abysmal. I have desktop effects disabled and even simple operations like dragging Firefox window across the desktop cause lots of tearing and jittering. It's so much worse than the OSS driver that I suspect something in my Xorg config is missing. Searching various forums did not bring any hints however. Anyone having the same problem? Solutions?
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Re: Horribly slow 2D rendering with ATI fglrx drivers
Under Device sectioin in xorg.conf, add the following line
Option "XAANoOffscreenPixmaps" "true"
Basically, it uses CPU to do 2D rendering.HP ProBook 4310s - ATI Radeon Mobility 4330 - pae kernel<br /><br />http://idyllictux.wordpress.com/ -
Re: Horribly slow 2D rendering with ATI fglrx drivers
Enabling XAANoOffscreenPixmaps just made everything totally unusable since it disabled any traces of 2D acceleration that left.
I have finally solved all the problems by getting rid of my Radeon card and replacing it with a NVidia GT 220. Was impressed by the fact that Ubuntu offered me automatic video reconfiguration option on next reboot, which actually worked like a charm
. Now my desktop flies and everything works perfectly even with the default nouveau open source driver. I might try NVidia proprietary blob later on for that desktop effects stuff...
Not sure if this kind of "solution" deserves a [SOLVED] tag in the subject line but I can highly recommend it. Stay away from ATI cards!
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