The controlD device

Dave Airlie airlied at
Fri Oct 21 07:36:13 PDT 2011

On Fri, Oct 21, 2011 at 3:18 PM, Dave Airlie <airlied at> wrote:
> On Fri, Oct 21, 2011 at 3:06 PM, Thomas Hellstrom <thellstrom at> wrote:
>> Dave,
>> What is the drm control device nodes really used for?
>> On my fc14 system it seems like it has world rw privileges, and full access
>> to all modesetting ioctls.
>> Is that the intention?
> No, and I just realised we packaged a broken udev rule.
> It should be root only, oops.
> Its intention is for setting up multi-seat and gpgpu access to the drm.
> change /etc/udev/rules.d/91-modeset.rules to be 0600.

I've filed updates to Fedora to fix this, no other distro should be
using or caring about these device nodes yet, since we never really
got GPGPU going yet.


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