Okay, here you go 
What I unterstood so far is: The implementation of Mesa/OpenGL is broken in this game. Thats why Mesa tries to open /dev/pts/1.
Up to Bookworm this was no issue, because Mesa had a failback. It ignored this nonsense and still opened the right device. But now with Trixie it's more strict. The failback changed to software rendering, sadly.
I also tried LIBGL_DRI3_DISABLE, didn't work either.
System is runinng on DRI2 only, probably because of hybrid graphics.
I also tried forcing DRI3 for the AMD graphics. KDE didn't start then.
Then I tried to force it for the i915 (Option "DRI3" "true"). But still only DRI2.
Gamescope also doesn't work. It says game window is created and then I got a black screen only and process is frozen.
Code:
$ grep "DRI" /var/log/Xorg.0.log[ 17.152] (II) modeset(0): [DRI2] Setup complete[ 17.152] (II) modeset(0): [DRI2] DRI driver: iris[ 17.152] (II) modeset(0): [DRI2] VDPAU driver: va_gl[ 17.152] (II) AMDGPU(G0): [DRI2] Setup complete[ 17.152] (II) AMDGPU(G0): [DRI2] DRI driver: radeonsi[ 17.152] (II) AMDGPU(G0): [DRI2] VDPAU driver: radeonsi[ 17.152] (==) AMDGPU(G0): DRI3 enabled[ 17.161] (II) Initializing extension DRI3[ 17.179] (II) GLX: Initialized DRI2 GL provider for screen 0[ 17.179] (II) Initializing extension XFree86-DRI[ 17.179] (II) Initializing extension DRI2Code:
$ inxi -GSazSystem: Kernel: 6.12.63+deb13-amd64 arch: x86_64 bits: 64 compiler: gcc v: 14.2.0 clocksource: tsc avail: hpet,acpi_pm parameters: BOOT_IMAGE=/boot/vmlinuz-6.12.63+deb13-amd64 root=UUID=6712f504-9c40-46f9-9cf9-b6c4376480ab ro resume=UUID=bc28d560-bc9e-4ce8-b5b1-f9ccc9748b8f Desktop: KDE Plasma v: 6.3.6 tk: Qt v: N/A info: frameworks v: 6.13.0 wm: kwin_x11 tools: avail: light-locker vt: 2 dm: SDDM Distro: Debian GNU/Linux 13 (trixie)Graphics: Device-1: Intel Skylake GT2 [HD Graphics 520] vendor: Hewlett-Packard driver: i915 v: kernel arch: Gen-9 process: Intel 14n built: 2015-16 ports: active: eDP-1 empty: DP-1,HDMI-A-1,HDMI-A-2 bus-ID: 00:02.0 chip-ID: 8086:1916 class-ID: 0300 Device-2: Advanced Micro Devices [AMD/ATI] Topaz XT [Radeon R7 M260/M265 / M340/M360 M440/M445 530/535 620/625 Mobile] vendor: Hewlett-Packard driver: amdgpu v: kernel arch: GCN-3 code: Volcanic Islands process: TSMC 28nm built: 2014-19 pcie: gen: 3 speed: 8 GT/s lanes: 4 link-max: lanes: 8 bus-ID: 01:00.0 chip-ID: 1002:6900 class-ID: 0380 temp: 31.0 C Device-3: Lite-On HP HD Camera driver: uvcvideo type: USB rev: 2.0 speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 1-6:3 chip-ID: 04ca:7053 class-ID: 0e02 serial: <filter> Display: x11 server: X.Org v: 21.1.16 with: Xwayland v: 24.1.6 compositor: kwin_x11 driver: X: loaded: amdgpu,modesetting unloaded: fbdev,vesa dri: iris gpu: i915 display-ID: :0 screens: 1 Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.00x11.22") s-diag: 582mm (22.93") Monitor-1: eDP-1 model: AU Optronics 0x109d built: 2015 res: mode: 1920x1080 hz: 60 scale: 100% (1) dpi: 128 gamma: 1.2 size: 381x214mm (15x8.43") diag: 437mm (17.2") ratio: 16:9 modes: 1920x1080 API: EGL v: 1.5 hw: drv: intel iris drv: amd radeonsi platforms: device: 0 drv: radeonsi device: 1 drv: iris device: 2 drv: swrast gbm: drv: kms_swrast surfaceless: drv: radeonsi x11: drv: iris inactive: wayland API: OpenGL v: 4.6 compat-v: 4.5 vendor: intel mesa v: 25.0.7-2 glx-v: 1.4 direct-render: yes renderer: Mesa Intel HD Graphics 520 (SKL GT2) device-ID: 8086:1916 memory: 3.69 GiB unified: yes API: Vulkan v: 1.4.309 layers: 7 device: 0 type: integrated-gpu name: Intel HD Graphics 520 (SKL GT2) driver: mesa intel v: 25.0.7-2 device-ID: 8086:1916 surfaces: xcb,xlib device: 1 type: discrete-gpu name: AMD Radeon R7 M340 (RADV ICELAND) driver: mesa radv v: 25.0.7-2 device-ID: 1002:6900 surfaces: xcb,xlib device: 2 type: cpu name: llvmpipe (LLVM 19.1.7 256 bits) driver: mesa llvmpipe v: 25.0.7-2 (LLVM 19.1.7) device-ID: 10005:0000 surfaces: xcb,xlib Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo de: kscreen-console,kscreen-doctor wl: wayland-info x11: xdriinfo, xdpyinfo, xprop, xrandrStatistics: Posted by Freeze — 2026-02-07 06:20