Favourites missing when booting with a smartphone connected

[Sebastian Cherek]

1. Connect an android phone through USB, I have also set in android 'Developer Options'->'Default USB Configuration'->'USB Tethering' (also checked 'File transfer' with same results, sadly there is no option to disable all this so cannot test without this step)
2. Reboot Ubuntu with phone screen locked, don't unlock the phone.
3. After Ubuntu has rebooted, there are no favourites on the dock.
4. To get the icons back, open any application and wait about a minute. Unlocking the phone screen after the system has booted doesn't help (see on that below)

Presumably after changing USB Tethering to File Transfer in android dev options, it started to often freeze the whole Ubuntu system boot procedure, not even sysrq keys are responding. The boot after the freeze is fine but displays tty output instead of a blank screen or the splash (i'm not always getting ubuntu splash screen but just a blank screen)
If the phone screen is unlocked during Ubuntu's reboot, the system boots fine and dock is working properly, but there is an increased chance of display modesets after logging in.

The phone tested runs android 10, tested an android 2 phone and it didn't reproduce the issue. Likely setting default usb config in developer options is the key here.

Ubuntu 20.04.1

[Daniel van Vugt (vanvugt)]

Let's assume this is the same as bug 1896110.