On 17/10/17 01:18 PM, Nicolai Hähnle wrote: > On 17.10.2017 12:41, Michel Dänzer wrote: >> On 17/10/17 12:29 PM, Nicolai Hähnle wrote: >>> On 17.10.2017 12:07, Michel Dänzer wrote: >>>> On 17/10/17 11:33 AM, Nicolai Hähnle wrote: >>>>> From: Nicolai Hähnle <nicolai.haeh...@amd.com> >>>>> >>>>> When enabled, this will request FreeSync via the hybrid amdgpu DDX's >>>>> AMDGPU X11 protocol extension. >>>>> >>>>> Due to limitations in the DDX this will only work for applications >>>>> that cover the entire X screen (which is important to keep in mind >>>>> when >>>>> you have a multi-monitor setup). >>>> >>>> This limitation already applies to page flipping in general, it's not >>>> specific to FreeSync. >>> >>> Maybe it shouldn't apply in general? After all, what if you have one >>> monitor with 60Hz and one with 90Hz? >> >> Page flipping can be used in that case. The application's buffer swaps >> will be synchronized to one or the other CRTC, by default the one where >> the largest part of the window is visible on. On the other CRTC(s), each >> flip may take effect slightly earlier or later than on the >> synchronization CRTC. > > Hmm. I seem to have lost the plot and/or we're talking past each other. > Maybe we need to go back to square one? > > To rephrase the point that I was trying to get across: When you have a > multi-monitor setup, and your application window covers (only) one of > these monitors, then FreeSync will *not* be enabled. > > At least that's how I understand the current DDX implementation, and I > think it's surprising enough that it should be pointed out explicitly.
I'm pointing out that the reason for this is that it's a limitation of page flipping, and adaptive sync can only work with page flipping. -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
