this post was submitted on 29 Jun 2025
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Just in case you didn't know, odd numbered Ubuntu versions (in your case 25) are considered short term releases and won't be maintained beyond a year or two.
Unless you really need that version, you'll want to install 26 when it comes out next April (upgrade should be very seamless).
Even numbered versions are supported long term, often for several years.
24.04 doesn't have 6.14: https://kernelnewbies.org/Linux_6.14#NT_synchronization_primitive_driver_for_faster_games
Assuming you're playing games through Proton rather than vanilla Wine, kernels before 6.14 already have fsync which is used by Proton and effectively does the same thing as ntsync.
I don't think either has ntsync support enabled by default, but it's supposed to have better accuracy or performance, thanks to putting the needed APIs directly in the kernel, right?