Hi guys! So since I switched to Debian 12 from Debian 11 I have mouse input lag in the game I play (Wolfenstein Enemy Territory) running native linux binaries using Gnome (version 43) as a desktop enviroment. To isolate the problem to Gnome I did clean install of Debian 12 with XFCE and mouse was working perfectly fine, so I did clean install again with GNOME. When I switch to say, tty4 and run the game with:

xinit /usr/local/bin/et-sdl-sound -- :1 vt$XDG_VTNR

to run it on new bare x server mouse works flawlessly again. When I play another game (Quake Live) on steam through proton the problem doesn't exist. The only idea I have is perhaps that full screen window unredirect doesn't kick in when playing said game and yes the game is running on fullscreen resolution. It is set to 1920x1080. I also tried windowed mode but that didn't help either. Any ideas? Did someone encountered same problem? Cheers and thanks for help in advance

Hi,

I think that gnome on Debian 12 will be using wayland by default, where as xfce and
xinit are x11. So your issue may be related to that. Try selecting gnome on X11 from
the gdm login screen (bottom right corner) after selecting your user.

Evo2.

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Hi. Thanks for help, but I'm already running on X.
EDIT: To desribe it better it feels like vsync is on. I do turn it off when playing the game with vblank_mode=0 et-sdl-sound and i think vsync is off since i get 125 fps instead of 60, so it's not vsync issue, but it feels very similiar to playing with vsync. I was thinking perhaps freesync is an issue? Not sure if it's turned on by default. I use amd GPU with radeon as a driver. But It seems like compositor doesn't turn itself off for some reason is there some command I can check if compositing is turned off on game window?