protonscr

Keyboard input gets ignored since Proton 6.3 when hitting ctrl+shift+e or ctrl+shift+u

protonopen Regression
ValveSoftware/Proton#4965 · opened 2021-07-12 by Corben78 · updated 2026-01-24 · 5 comments · github
CCorben78 2021-07-12 github

System Information

  • GPU: RTX 3080
  • Driver/LLVM version: nvidia 470.42.01
  • Kernel version: 5.4.0
  • Link to full system information report as Gist
  • Proton version: 6.3-5

I confirm:

  • [x] that I haven't found an existing report for this issue.
  • [x] that I have checked whether there are updates for my system available.

Symptoms

In Everspace 2 it happened to me, that after a certain key combination the space ship stopped accepting keyboard input. After pressing random keys it somehow worked again, but for a while I wasn't able to figure out which combination it was. After verifying it doesn't happen on Windows and being able to reduce the keys in question that cause this issue, I figured out it happens when I press the combination left ctrl + left shift + e. I was able to confirm this also happens in the game GTFO. This allowed me to google for that shorcut and lead me to the emoji and unicode input: https://askubuntu.com/questions/1083913/what-does-ctrl-shift-e-do-while-typing-text/1159087#1159087

Reproduction

When hitting the shortcut ctrl+shift+e or ctrl+shift+u in games using Proton 6.3 most keys are getting ignored until you hit enter or esc. When pressing ctrl+shift+e and space a menu pops up in the bottom left corner.

This does not happen with Proton 5.13 (tested with Everspace 2).

Workaround

Workaround for me is to start ibus-setup via terminal, open the emoji tab and remove both shortcuts.

Ggiomasce 2021-07-14 github

I could reproduce it and I am working on it.

RRiven-Spell 2022-01-13 github

This also affects me; Thanks for reporting a workaround!

Hharzival 2022-03-05 · hidden on GitHub github

I believe I am having this issue with Proton 7.0-1 used directly through Steam to run Apex Legends.
I'm unsure of the input trigger, but at certain points during game-play no keyboard input registers until the enter key is pressed.

Ubuntu 20.04 LTS
GTX1080TI
i9-7900X @ 3.30GHz

Hharzival 2022-05-03 github

Issue persists in Proton 7.0-2, the trigger is shown to be CTRL+SHIFT+E, which I press crouch sliding while interacting in Apex Legends on default binds, be interested to know if this issue is on deck too.

Nnumerfolt 2026-01-24 github

Issue persists in Proton 10.3, but only CTRL+SHIFT+U for me, which I use in AoE2:DE to select all universities.

Setting it to CTRL+SHIFT+ALT+U in ibus-setup fixes it for me.

Proton versions