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Mouse not letting you look around fully in fullscreen proton steam game #4092

Description

@GregStillPlays
  • I have searched the issue tracker and not found a duplicate for my issue.

Distribution (run cat /etc/os-release):
NAME="Pop!_OS"
VERSION="24.04 LTS"
ID=pop
ID_LIKE="ubuntu debian"
PRETTY_NAME="Pop!_OS 24.04 LTS"
VERSION_ID="24.04"
HOME_URL="https://pop.system76.com"
SUPPORT_URL="https://support.system76.com"
BUG_REPORT_URL="https://github.com/pop-os/pop/issues"
PRIVACY_POLICY_URL="https://system76.com/privacy"
VERSION_CODENAME=noble
UBUNTU_CODENAME=noble
LOGO=distributor-logo-pop-os

Setup:
mouse: Corsair DarkCore RGB
gpu: GTX 1660 super
cpu: ryzen 5 3600

Issue/Bug Description:
While playing a 3rd person game which lets you look around using the mouse, the mouse only lets you go so far before blocking the movement, as if the not-visible cursor is hitting the monitor end and not being able to go further. As a result, games which require you to look around are unplayable.

Steps to reproduce (if you know):

  • Open a steam game where you can use your mouse to look around. (haven't tested on non-proton ones, but I'm guessing it's a Cosmic issue so it shouldn't make a difference)
  • Try to look around fully, 360 degrees.

Expected behavior:
The cursor should be locked in place and letting you move and look normally.

Other Notes:
I tested this on two UE5 third-person games, all using proton experimental. I tried countless launch options and settings, I tried using shortcuts to make the DE focus on the game properly, absolutely nothing worked except switching back to gnome DE.

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