Hi guys!

I use Gentoo myself, with kernel 4.15.0 and systemd installed (I know what you may think)
and I'm having similar problem.

A lead I followed brought me to a page about MTP on Arch Wiki (link).

I followed this solution (located on the bottom of section). Note that the file path might be different (as mine is on /usr/share/solid/actions/solid_mtp.desktop, located thru help of package manager)
The error stopped, but the mtp:/ turned to show me nothing. mtplib commands seem to work, showing me files I know located on the phone, but dolphin shows none of these.

Anyway, seems like a progress. I thought some of you'd wanna know.

Thank you both for trying with systemd and udev.
Do those distributions have an gvfs that is equal to the patched one we got in slackware? since the patches might fix it for udev.
ftp://ftp.osuosl.org/pub/slackware/s...source/l/gvfs/

I have tested -current with up2date gvfs 1.35.4 (wich has those patches applied) and i still don't get my device connected using thunar but it works with kernel 4.9.79+Plasma5. lsusb does recognize the device but it does not appear in thunar.

For me, this problem is not due to gvfs, dolphin does not depend on gvfs, elsewhere uninstall gvfs, has no influence in plasma5 or kde, it's kio-extras, which manages protocol mtp in plasma5, and kio mtp, does not depend on gvfs, i think gvfs is only for gnome and gtk soft.

With current as of march 1 i tried again and now things works better.
Opening the device using "usb icon thing" (i have no idea what it's called in english) i got mtp protocol died in dolphin.
If i try to open the device from within dolphin it seems to work and i can copy some files to my smartphone.
Does it work for you guys as well?

EDIT: i spoke to soon when i tried to use a file on the device with dolphin it didn't work and mtp protocol dies.

This kde bug isn't solved for the moment:

https://bugs.kde.org/show_bug.cgi?id=387454