Bug#566669: xserver-xorg-core: VGA Arbitration prevents DRI starting

[Michel Dänzer <daenzer@debian.org>]

On Sun, 2010-01-24 at 15:00 +0000, Dick Middleton wrote: 
> Julien Cristau wrote:
> 
> >> Following upgrade DRI is no longer enabled for display:
> >>
> >> (WW) RADEON(0): Direct rendering is not supported when VGA arb is
> >> necessary for the device
> >> (EE) RADEON(0): [dri] DRIScreenInit failed.  Disabling DRI.
> >>
> > This is fixed with kernel mode setting, AIUI.  I don't think it will be
> > fixed for userspace mode setting.
> 
> Thanks for that.  radeon.modeset=1 kernel option works.  However I get 
> no output on VTs.

That's usually due to one of two things:

      * Your X driver doesn't support KMS (none of the radeon driver
        packages in Debian do, only upstream Git master), so it's
        touching the hardware directly behind the kernel's back. 
      * The fbcon kernel module isn't loaded.


-- 
Earthling Michel Dänzer           |                http://www.vmware.com
Libre software enthusiast         |          Debian, X and DRI developer