R200 DRM/KMS

[Alex Deucher]

On Mon, Jul 6, 2015 at 9:39 AM, Steven Newbury <steve at snewbury.org.uk> wrote:
> Hi,
> I've been trying to get DRM/KMS working with the current graphics
> stack (xf86-video-ati 7.5, xserver-1.17) on a R200 series card.  I
> assumed this should be working since KMS was implemented for it a
> while back, and it has been working with xf86-video-ati-6.x.
>
> Unfortunately, it doesn't seem to work.
>
> I've narrowed it down to drmSetInterfaceVersion() failing when called
> from the ATI driver (in radeon_kms.c).  This is a bit strange since,
> /sys/class/drm/version correctly reports 1.1.0 20060810.  Presuably
> it's getting the correct fd for the DRM master otherwise it should
> bail earlier?
>
>
> Googling confirms others have had the same issue, and generally the
> resolution has been to stick with the old driver.
>
> Should this be working?  Is it known to be broken?

It should be working.  Make sure the kernel driver has kms enabled,
firmware available, and that the kernel driver is loaded before
starting X.  If the kernel driver is not loaded before X starts you
can get a version mis-match error.

Alex