On Sat, 19 Nov 2022, Andreas Bergmeier wrote: > So after some tinkering I have code now that succeeds in retrieving state > via sending reports once. After that all following sends time out. > I am at a loss what I am doing wrong, tbh. RFC below. I noticed that by default hidraw, hiddev and hid-input are loaded for Glow. Probably because it exposes a Consumer Control page in Reports. Is it possible that hid-input interferes with hid-logitech-hidpp? I was trying to disable hid-input using - HIDPP_QUIRK_NO_HIDINPUT - hid_ignore_list For the former it still seems to load hid-input. For the latter it doesn't seem to load hid-logitech-hidpp. I couldn't yet untangle all the hid driver indirections and loading.