This is the best summary I could come up with:
First up, there are several fixes to the Steam HID driver (hid-steam) that are picked up from Valve's downstream in the latest SteamOS beta builds.
For Linux 6.8 the HID Steam driver fixes include no longer overwriting the smoothing parameter, cleaning up the locking code, better handling for the serial number reporting, supporting the gamepad-only mode switch by holding options, and other changes.
As part of that patch is adding support for haptic pulses as also done by Steam when using the hotkey.
The other notable HID work in Linux 6.8 is adding support for the Nintendo Switch Online (NSO) controllers.
The HID subsystem in Linux 6.8 is also seeing support for custom sensor-hub sensors like hinge angle sensors that previously weren't working, Ilitek ili2901 touchscreen support, and various other HID driver updates.
See this pull request for the full list of HID updates for the Linux 6.8 merge window.
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