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Ubuntu's Mir May Be Ready For FreeSync / Adaptive-Sync
If the comments from this Mir commit are understood and correct, it looks like Mir may be ready for supporting FreeSync/Adaptive-Sync.
While NVIDIA's proprietary driver supports their alternative G-SYNC technology on Linux, AMD FreeSync (or the similar VESA Adaptive-Sync standard) has yet to be supported by the AMD Linux stack. We won't be seeing any AMD FreeSync support until their DAL display stack lands. DAL still might come for Linux 4.9 but there hasn't been any commitment yet by AMD developers otherwise not until Linux 4.10+, and then after that point FreeSync can ultimately come to the open-source AMD driver. At least with the AMDGPU-PRO driver relying upon its own DKMS module, DAL with FreeSync can land there earlier.
Once the driver-level work is in place, it will be interesting to see how well FreeSync/Adaptive-Sync works on Linux and what other changes might be necessary for Mir/Wayland/X.Org. They do already have the xf86-video-amdgpu DDX change that's also needed. I do have the ASUS MG28UQ 4K monitor with Adaptive-Sync support that I've been waiting to play with under Linux.