Ubuntu 20.04LTS fully updated. Installed the steam package. Have used Steam on Linux on a previous install. When I run Portal, keyboard controls and both mouse buttons work correctly. However, I can only turn my body 90 degrees when sliding the mouse left or right. Occasionally, I can get the 90 degree range to shift (e.g. by looking straight down and moving left or right with A or D), but after doing that, I'm stuck to a new 90 degree viewing range. This makes even simple tasks frustratingly difficult. Is this a known issue? Are there any workarounds? Seems to be specific to Steam/Portal as I have no mouse issues outside of Steam.

  • I tried Portal 2 in Steam (on Ubuntu 20.04LTS) and don't have this problem.
    – jrennie
    Oct 3, 2021 at 0:12
  • 1
    That is an extremely weird behaviour, do youhave other screens and your mouse isn't locked to the game, perhaps? I can't imagine what would cause this
    – CoqPwner
    Oct 3, 2021 at 15:14
  • One (vertically oriented) screen. Not sure how I'd check whether the mouse is locked to the game, but I don't have any special mouse config. Is there somewhere I can look to check on locking? Thanks for reading!
    – jrennie
    Oct 4, 2021 at 16:18
  • It shouldn't be an issue at all if you are only using a single screen. Sorry I can't help
    – CoqPwner
    Oct 4, 2021 at 17:58
  • Yup, I'm just using one screen. Definitely a weird one!
    – jrennie
    Oct 5, 2021 at 18:29


You must log in to answer this question.

Browse other questions tagged .