Proton is a tool for use with the Steam client which allows games which are exclusive to Windows to run on the Linux operating system. It uses Wine to facilitate this.

Most users will prefer to use Proton provided by the Steam client itself. The source code is provided to enable advanced users the ability to alter Proton. For example, some users may wish to use a different version of Wine with a particular title.

New in Proton 4.11-5:
Fix a crash caused by certain input devices that was introduced in Proton 4.11-4.
Fix games running in virtual desktops and semi-transparent windows, both problems introduced in Proton 4.11-4.
Performance optimization when using a controller on amdgpu driver.
Improvement to fsync implementation when WINEFSYNC_SPINCOUNT is set.