570.86.16 Linux driver breaks HDMI output when adaptive sync is enabled

Breaks display on Debian and fedora, and I assume everywhere else

I am seeing the same issue, both on Nobara (KDE) and on CachyOS (KDE and Gnome). Adaptive sync is enabled in display settings in KDE/Gnome, but my TV (LG C4) no longer picks up VRR.

When enabling VRR changes in refresh rate will cause the display to flicker “out of sync” depending on how fast you move an image on the screen.

Arch Linux, x11 or Wayland, KDE and Gnome
Samsung S95B
RTX 4090

Same issue on Gentoo. DisplayPort works fine, HDMI loses sync the second VRR turns on. 4090 and Samsung G80SD here. 565 series works perfectly (reverted back for the time being).

Thank you for reporting issue, I have filed a bug 5087824 internally for tracking purpose.
Please share nvidia bug report from repro state.

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Out of interest.
Did you update your C4 ?

Everything was fine in my case but since I updated to the “new” webos and the screen remains black once I use hdmi2.1 and not hdmi 1.4 ( 4k30hz )

Sadly this webos refuses downgrades…

nvidia-bug-report.log.gz (430.5 KB)

I’m on bazzite-nvidia-open:stable
output to a TV: Samsung S95BA

Easiest way to reproduce in KDE: go to Settings → Display and Monitor, set Active Sync to Always. Monitor goes black with occasional flickers.

I put a bug report for this in the 570 release thread as well.

Also breaks in x11. On gnome desktop it will say VRR is enabled when it actually won’t activate. KDE on the other hand does activate and breaks when it does.