Discussions and news about gaming on the GNU/Linux family of operating systems (including the Steam Deck). Potentially a $HOME away from home for disgruntled /r/linux_gaming denizens of the redditarian demesne.
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Original /r/linux_gaming pengwing by uoou.
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You could try systemd-inhibit as a prefix to any game launch command, much in the same way as gamemoderun is used.
Sidebar: this could be considered an example of the XY Problem. You should consider editing the title since the problem you're really hoping to solve is your laptop going to sleep while you play a game.
While the XY problem sort of applies to this post, I think labeling it as such might be a little too dismissive, since this is one of those rare cases where OP has correctly identified the root cause of the observed issue.
(While easier workarounds do exist, the ideal solution would indeed be fixing the hardware manager's input idle detection such that it no longer ignores game controllers.)
Joystickwake or gamemode ought to help here.