Alan Stern wrote:
Evidently the "bad" program gets started by some utility running under
X. When X is off, the player works.
Exactly.
I continued my tries. Starting up a plain X-server didn't trigger this
issue, so I tried with a new user and logged in to a X session with this
test user. Again, the problem didn't exist.
Now I remembered, that I have "Amarok" in autostart of my regular user,
so I logged in with my regular user, closed Amarok and plugged my
player. With Amarok closed, the player immediately was available as
regular usb flash drive.
After some more debugging, I tracked this problem down to "libmtp". In
/lib/udev/rules.d/90-libmtp.rules, I found my vendor/product id
combination of my player for some other player. Seems like this vendor
uses same product ID for more than one model. Either my player doesn't
work with mtp at all or something is wrong with my libmtp installation.
To disable mtp at all (don't need it), I created an empty file
/etc/udev/rules.d/90-libmtp.rules which effectively disables the
original file.
After doing so, my MP3 stick seems to work the way it should do. Noone
kills the device down while it tries to initialize the usb-storage device.
Maybe I should contact the libmtp team to discuss with them, if they
should improve their udev rules to not match for this player.
Thanks for your help with tracking down this issue!
Yours
Manuel
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