Public bug reported:
On Ubuntu 24.04 LTS, IBus 1.5.29 causes incorrect keyboard event
handling in some Windows games running through Steam Proton.
With a French AZERTY keyboard, accented keys such as:
- é
- è
- à
- ç
are not correctly detected by Proton games when configuring keyboard
bindings.
The issue is especially visible with the "2/é" key:
- Pressing "é" alone: the game does not detect any key press.
- Pressing Shift+é: the game detects the character "EACUTE".
This affects multiple games using different engines, including:
- Shadow of the Tomb Raider
- Rise of the Tomb Raider
- Tomb Raider (2013)
- Heavy Rain
- Beyond: Two Souls
The issue is not caused by the keyboard layout configuration.
Tests performed:
- GNOME keyboard layouts tested:
- French (fr)
- French (fr+oss)
- French (obsolete, variant) (fr+latin9)
- Wayland and X11 sessions tested
- Steam Input disabled
- Multiple Proton versions tested:
- Proton Experimental
- GE-Proton 11.1
All showed the same behaviour.
The issue disappears when launching the game with:
XMODIFIERS="" %command%
This indicates that IBus is interfering with keyboard events passed to
Proton/Wine.
Diagnostic information:
The XKB layer works correctly.
Example with xev:
Pressing "é":
keycode 11
keysym eacute
XLookupString gives "é"
Pressing Shift+é:
keycode 11
keysym 2
Therefore the hardware input and XKB configuration are correct. The
issue happens later in the input stack, when events are handled by IBus
and passed to Proton/Wine.
Environment:
- Ubuntu 24.04 LTS (Noble)
- GNOME desktop
- Wayland session (also reproduced with X11)
- AMD GPU
- Steam stable client
IBus package:
$ apt policy ibus
ibus:
Installed: 1.5.29-2
Candidate: 1.5.29-2
Repository: Ubuntu 24.04 LTS (noble) main
Workaround:
Adding the following Steam launch option fixes the issue:
XMODIFIERS="" %command%
Expected behaviour:
French AZERTY keyboard keys should be correctly passed to Proton games
and should be bindable in game configuration menus.
Request:
Please consider backporting the relevant upstream IBus fix from newer
IBus releases (1.5.30+) to Ubuntu 24.04 LTS.
Ubuntu 24.04 is an LTS release, but this regression affects
compatibility with applications relying on Wine/Proton input handling. A
targeted SRU/backport would improve compatibility for non-US keyboard
layouts without requiring a full IBus version upgrade.
** Affects: ibus (Ubuntu)
Importance: Undecided
Status: New
** Tags: ibus keyboard noble non-us-keyboard proton wine
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https://bugs.launchpad.net/bugs/2161187
Title:
[Ubuntu 24.04] IBus 1.5.29 breaks French AZERTY accented key input in
Proton games
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