Your system information

• Steam client version: 1778003620 (built May 5 2026)
• Distribution: MX Linux 25.1 64-bit
• Opted into Steam client beta?: Both crash
• Have you checked for system updates?: Yes
• Steam Logs: [attached]
• GPU: NVidia 3090, driver 580.142
• Kernel version: 6.12.74+deb13+1-amd64

Please describe your issue in as much detail as possible:

Steam segfaults immediately on launch under KDE Wayland (wayland-0). The crash occurs consistently on both the stable client and the beta client, both of which are on build 1778003620 (released May 5 2026). The process dies at steam.sh line 966 with a segmentation fault.

Two XOpenIM() failed errors are printed before the crash, followed by the segfault. The client never reaches the GUI and segfaults within 2 seconds.

Expected: Steam launches normally under KDE Wayland as it did prior to today's update.
Actual: Immediate segfault every launch.

Terminal output:

XOpenIM() failed, LANG = en_US.UTF-8
XOpenIM() failed, LANG = en_US.UTF-8
XRRGetOutputInfo Workaround: initialized with override: 0 real: 0xf6086370
XRRGetCrtcInfo Workaround: initialized with override: 0 real: 0xf6084cc0
~/.steam/debian-installation/steam.sh: line 966: 441518 Segmentation fault      "$STEAMROOT/$STEAMEXEPATH" "$@"

Steps for reproducing this issue:

1. Run KDE Plasma on Wayland (WAYLAND_DISPLAY=wayland-0)
2. Launch Steam via terminal
3. Steam segfaults before reaching the main window

Workarounds attempted (none successful):

• SDL_VIDEODRIVER=x11 steam
• STEAM_DISABLE_WAYLAND=1 steam
• steam -noverifyfiles -nobootstrapupdate
• Steam beta client (same build, same crash)

steam-logs.tar.gz