It's possible that this setting is only available in Logitech software, which is not available on Linux. You could try setting it on a Windows machine (🤮) and save it on the mouse, then use with Linux. Or perhaps there's a way to run Logitech soft on Linux (wine/VM?).
Well my PC is dual-booted with Windows (I have to, for work reasons, my job pretty much requires the Adobe suite, though as another plus, having to reboot to a different environment where I have none of my games and shit does help my brain change gears from "fun time" to "work time") -- So right now (which is work hours) I have set things up on G Hub and saved it to the mouse's internal memory. I'll reboot into Linux later today and see if that made any difference whatsoever.
EDIT: It woooooorked! :D
For Logitech devices there is also Solaar.
You can check if it has the functionality you want (not sure, since I haven't used it much and only for basic stuff).
Solaar seems to be for something else, but I'll try it nonetheless.
I would have assumed that this happens purely at the mouse level, with no need for OS integration.
It does not, because this button, like every OTHER button in the mouse, is configurable.
So if you don't want to change DPI at all for your gaming/work flow -- You can just give yourself extra buttons.
On Windows to get any functionality out of a Logitech Mouse's extra buttons you gotta get Logi's proprietary programme. On Linux, Piper/Ratbag does a great job, but I just couldn't find this specific mapping (and additionally when I first plugged in the mouse, meaning it'd be on factory settings, the DPI shift button wasn't doing anything) and that's why I'm wondering if it's unsupported.
It IS set at the mouse level, to change it you need to change in in the Logitech app which is windows only.
There is no mapping because the command to change DPI never leaves the mouse (as when using the DPI changing buttons by default ) but you may remap the button to MB8 or something if you want.
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