Follow this, it's a known issue, but is fixed in the bleeding edge branch of Proton: https://github.com/ValveSoftware/Proton/issues/7486#issuecomment-2174772421
Thanks for the tip. It is working again now. I had followed that previously. But I also had to select bleeding edge latest untested under proton experimental betas.
For what it's worth, the SteamDeck is Linux. If something broke for HD2 on SteamDeck, there would be a lot of people discussing it as a major issue.
there seems to be a fix for this issue on the steam deck that i found on the "other" site https://www.reddit.com/r/Helldivers/comments/1dfdzmo/june_13th_update_borked_linux_microphones/l97nwqd/ and it seems to work for me now as well. had to select latest untested bleeding edge
Is the pulseaudio control panel showing the correct input device for HD2?
To expand upon this, if your mic isn't working in pulseaudio, it won't work anywhere else. Confirming your input and levels in there is the first step.
In my case, I have this issue in Valheim where the application will for some reason pick the wrong audio output device whenever the game is launched. This issue is specific to a certain Unity engine version.
I had no idea what was going on until I inspected Valheim though the old pulseaudio control panel. Annoyingly, the GNOME 40+ volume mixer does not facilitate this functionality ootb.
I agree that the pulseaudio control panel is the best (graphical) tool for managing different input/output devices are.
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