On 2018-10-05 6:21 p.m., Kazlauskas, Nicholas wrote: > On 10/05/2018 04:10 AM, Pekka Paalanen wrote: >> >> 2. User preference >> A toggle on the desktop environment's display settings >> application to allow or disallow VRR. After all, video mode >> configuration is here too, and ideally applications should not >> mess with the video mode directly. > > [...] > > User preference can be handled as part of the DDX driver with something > like an X Option. Dropping the variable_refresh_enabled property in > favor of this works. This covers 2. The Xorg driver can expose a RandR output property, even if the kernel doesn't expose a corresponding connector property. See e.g. the TearFree output property in xf86-video-amdgpu. >> I also believe that it would be useful to expose vmin/vmax to userspace >> as properties, so that display servers and apps can plan ahead on when >> they will render. I suppose that can be left for later when someone >> starts working on userspace taking advantage of it, so that the proper >> userspace requirement for new UABI is fulfilled. > > Knowing the vmin/vmax could potentially be useful for testing but most > applications shouldn't be trying to predict or adjust rendering based on > these. FWIW, recent research indicates that this is necessary for perfectly smooth animation without micro-stuttering, even with VRR. -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
