Cannot unlock the UI on Canon EOS M50

Hello,
I have another problem with my EOS M50, regarding UI Lock.
I am trying things on two systems and two different libgphoto2 versions,
so, first let me try to summarize what are the various configurations. In
all cases, I am using a libgphoto2 compiled by me from the git repo.

Systems:
1. Ubuntu 19.04 (intel x86_64)
2. Raspian 9 on Raspberry Pi Zero W

libgphoto2 versions:
1. git revision acafc3324 (the current master as of today), let's call it
"NEW"
2. git revision 0c45b3615 (a version which I happened to have on my rpi),
let's call it "OLD"

The first weird thing, is the behavior of the camera as soon as I connect
the USB cable, before I even invoke gphoto2:
1. on Ubuntu, I can control the camera as normal
2. on raspberry, whenever I press a button, the LCD displays "BUSY" in the
bottom-left corner. After a bit of trial&error, I discovered that if I ran
"gphoto2 --set-config uilock=0" with the OLD gphoto, I could get the
control of the camera back.

But now, with the NEW gphoto2, uilock no longer works:
1. If I set uilock=0, I get the following error:

gphoto2 --set-config uilock=0


*** Error ***
PTP Device Busy

*** Error ***
Failed to set new configuration value 0 for configuration entry uilock.
*** Error (-110: 'I/O in progress') ***


2. If I set uilock=1, the LCD displays the image of a computer, and the
camera is locked. If I try to set uilock=0, I get the same error as above

3. If I run gphoto2 --config and try to set UI LOCK to No, I get "PTP
Device Busy" as in point (1)

4. If I run gphoto2 --config and go to "Camera Output", I can see that it's
set to "MOBILE2". If I set it to "TFT", I get the liveview back and I can
control the camera again. However, as soon as I exit gphoto2 --config, the
camera is locked again, and "Camera output" seems to be reset to "MOBILE2".

So, two questions:
1. Does anybody know why on rpi I get the annoying "BUSY" message as soon
as I connect the camera, and how to fix it?
2. Is there a way to fix the UI LOCK problem with newer lbgphoto2 versions?

I attach some of the debug logs which I get when I try to run "--set-config
uilock=0", in case they are useful.

Thank you,
Antonio

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