Comment # 46 on bug 1151290 from Fabian Vogt

(In reply to Stefan Dirsch from comment #45)
> (In reply to Fabian Vogt from comment #44)
> > > Just had a try on Leap 15.1. gdm can start X for the greeter as user gdm
> > > even if not being in the video group. I removed it from the group and voila,
> > > ACLs of NVIDIA devices are set for user gdm. 
> > > 
> > > On Leap 15.1 sddm is still starting X as root user, so I couldn't try with
> > > sddm yet.
> > 
> > Why not? I assume that the ACL is needed for hardware accelerated rendering,
> > otherwise sddm-greeter wouldn't need it at all.
> 
> I didn't claim anything different. Currently installing TW, where sddm now
> hopefully
> starts X as user sddm ...

sddm still runs X as root, even on TW.