550.135 Nvidia driver messed OpenGL, Vulkan and Gsync in some applications

English Hardware
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I have an GTX 1080 Nvidia card and an Asus ROG Pg348 Gsync monitor. Prior to the update Gsync worked fine, on LXQT at least.

I mainly use emulators and after the update I see that Gsync indicator is not shown in Retroarch and Snes9x Flatpak, while OpenGL driver is not detected at all.
When I choose OpenGL in Retroarch, application does not start at all and in Snes9x it is not detected. While on Vulkan, ROMs are unplayable due to slow speed. CPU is high on idle and very high during game too. Video acceleration does not work as a result.

Tried reinstalling 550.127 drivers, same issue.
Nvidia settings has all Nvidia features activated on X11, including OpenGL.

Has anyone else similar issues?

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Solved. It seems because install process froze due to dracul, Nvidia installer did not blacklist nouveau driver and I had to do it manually. Now all 3 work

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