Trying out VRR in Sway with a client which misses vblank most of the time:

- Without VRR: 33ms of delay between page-flips
- With VRR: between 16 and 20ms of delay

Pretty happy to see no flickering at all on my monitor.

Sway users who have a VRR-capable monitor & GPU: I'd be interested if you could try this patch out and report back if you experience flickering.

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@emersion Is there anything in particular that may cause flickering that shouldn't be, or do you mean in general use?

@Zurdo Some FreeSync monitors flicker when the refresh rate changes too rapidly. I'd like to know if anyone has this issue.

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