Hey everybody,
I installed LineageOS 20 (Android 13) on an old cellphone I had lying around. It works fine, apart from an odd problem: when I connect the phone to my computer by USB, the "Charging this device via USB" notification appears but all the USB preference options are greyed out.
Data transfer works however: if I go into System > Developer options > Default USB configuration, set it to Data Transfer, unplug the USB cable and plug it back in, the options are still greyed out, but File Transfer is selected and the drive appears on the PC. So it's not the cable, and my ports or plugs don't need cleaning.
It's very inconvenient to have to enable and disable this in the Developer options each time I want to transfer a file, and I most certainly don't want to leave Data tranfer enabled all the time.
I've been looking for a solution everywhere, and it seems plenty of people have the same problem with a lot of different phones, but nobody has a solution.
Anybody knows what might be going on here? Any adb shell command I could issue to reenable what might be disabled?
Maybe the problem is on your computer's end. Have you tried updating adb drivers and device-specific drivers (if any)? I've run into some issues with old adb drivers being present on the computer I was connecting to, even if the connection shouldn't have been going through adb in the first place. But some identifier was acting up and causing misidentification of the device.
I use Linux. There is no driver to install. But I just tried on my wife's Windows PC, which doesn't have any Android tools installed, and it's the same thing: all USB options are greyed out.