P.S.: I can confirm that it seems to correctly map to Windows sensitivity (that being 0.30, instead of the 2x increase -0.15- that I usually use in Source games on Linux), using Proton-GE 7.54. Perhaps it is an issue specific to Proton 8?
Though the fix (?) is appreciated, since this fix does not propagate to most other Source branches, perhaps it is better to keep the old "broken" sensitivity (requiring 2x that of Windows's) until each branch has a patch ready.
EDIT: If taken into consideration, please also allow players to adjust sensitivity by hundredths, and perhaps even thousandths, through UI. Though it may seem silly, it would help to partially prevent weird issues like this. (e.g. I previously had to have a separate mouse profile for Apex at 6000 DPI x 0.2 Sensitivity, to hit an "effective 1200 Source"-sensitivity).
