Bug#575945: exa not working with 2.6.33

[Alex Deucher <alexdeucher@gmail.com>]

On Tue, Mar 30, 2010 at 12:31 PM, Eduard Bloch <blade@debian.org> wrote:
> Package: xserver-xorg-video-radeon
> Version: 1:6.12.192-2
> Severity: important
>
> Hello,
>
> about a month ago, I was using radeon driver with my onboard IGP (HD4200
> from 785G chipset), and kernel 2.6.32.x.
> The only thing I needed to set explicitely were the
>    Option "AccelMethod" "exa"
>    Option  "DRI" "on"
> options and then everything (except 3D) was fine.
>
> Now I tried to use it again with 2.6.33. Result: works in 2D (less or
> more) but XVideo does not work at all.
>
> When KMS is enabled in the kernel module then I cannot see any reason
> for its breakage (log file attached).
>
> With KMS disabled, the 2D performace is a lot worse (slow repainting
> when moving/maximizing/switching windows) and I see a message in
> Xorg.0.conf telling:
>
> (WW) RADEON(0): Direct rendering is not supported when VGA arb is necessary for the device
> (EE) RADEON(0): [dri] DRIScreenInit failed.  Disabling DRI.

I suspect you are missing the ucode needed by the chip.  Make sure you
have the linux-firmware package installed.

Alex