#[linux] alt-tabbing (losing application focus) causes black screen crash

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slender wharf
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Distro: CachyOS
DE: KDE Plasma 6.6.4
Kernel: 7.0.3-1-cachyos
GPU: AMD Radeon 9070xt
GPU driver info: amdgpu, Mesa 26.0.6-arch2.2
Proton Version: proton-cachyos-11.0-20260429

If I alt tab out of the game (either alt-tab or user the super/windows key) it causes a black screen that will not recover and the game freezes and loops audio. Not always, but a very high percentage of the time. I did revert the game to stock and I was able to rapidly alt-tab in and out like a dozen times without this same type of crash.

tulip holly
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I have no clue how we could even affect anything like that, the only thing I can think of is that there's some problem between your setup and Unity 6.4

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maybe something there will help

slender wharf
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So as part of testing that out, and discovering the need to delete compatdata, after doing the full uninstall and reinstall to get it working again the alt-tab issue entirely went away. I'm not sure why the first installation of redux brought this issue but the manual full reinstall/wipe fixed it. I did a ton of alt tabbing through a multi hour play session after that.

So in summary;
Full manual game uninstall and reinstall fixed it for me. I don't know why.

Uninstall Redux through the updater. Uninstall KSP2 via steam. Navigate to your steam apps/compatdata/954850 and delete this as well (it's the proton windows files).

Now reinstall KSP2 through steam. Bring the patcher back over, install redux.

WARNING: your save files live in compatdata and you will delete them if you don't save them first!

elder spire
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I THINK THATS A UNITY ISSUE (encountered iton windows laptop before too bt maybe it's different on penguinos)

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Do you have 2 graphics cards?

slender wharf
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Technically yes as my 9800x3d has an iGPU so the system views 2 GPUs