Audio sync problem that gets worse as time goes on. after about an hour there is a roughly 5 second delay from when you shoot your gun and when you hear the gunshot sound. You can temporarily fix/reset it by going into the audio settings and setting the audio device to something else and then back to your default device.

Game must be started in fullscreen to work. Game will launch to a black screen if launched in native resolution. Fullscreen windowed works, but must be applied after the game launches in the video settings menu or else the game won't display anything. Windowed mode currently completely freezes the display and requires you to restart the game completely.

When playing in a non native aspect ratio or resolution such as 1280x960, the most popular resolution among pros, The mouse controls unpredictably. For horizontal aiming, slow movements and microadjustments barely register while fast movements and flicks feel about 20% too fast. For vertical aiming, all movements just feel way too slow and unresponsive as a whole. If this was any other game this would be a minor issue, but because this is Counter Strike, a very competitive game where almost nobody at the higher levels play native resolution, this is without a doubt the most pressing issue in the game right now.

Slightly worse performance than Windows but this is to be expected as Windows uses DX11 and Linux uses Vulkan

The game will occasionally turn off my secondary monitor. when trying to use xrander to enable my secondary monitor, my primary monitor will switch to 1280x960. Secondary monitor issues withstanding, the game always works fine apon first booting the game but will crash my entire PC apon a second boot. Not even exiting Steam is enough to circumvent this, the entire PC must be rebooted. This wasn't a couple days ago so I believe it was recent patch that did this.

All versions of Proton including GE are completely borked.

Some issues with hitreg currently, but this problem is not exclusive to linux and should be fixed soon.