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CDrummond / cantata

Qt5 Graphical MPD Client
GNU General Public License v3.0
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devices -identified but Not Connected #1669

Closed anarchotaoist closed 3 years ago

anarchotaoist commented 3 years ago

Hi Craig

Describe the bug Device category: device registers as present but does not bring up the music library on the phone. There is no connection either by right clicking and sending to device.

To Reproduce Steps to reproduce the behavior: Load Cantata and plug in Android phone or Plug in phone and load Cantata Click on devices Get phone icon and correct identity of phone displayed and message Not Connected

See error Open Cantata in Konsole:

Device 0 (VID=18d1 and PID=4ee2) is a Google Inc Nexus/Pixel (MTP+ADB). error returned by libusb_claim_interface() = -6LIBMTP PANIC: Unable to initialize device

Version Info Operating System: Kubuntu 20.10 KDE Plasma Version: 5.19.5 KDE Frameworks Version: 5.74.0 Qt Version: 5.14.2 Kernel Version: 5.8.0-40-generic OS Type: 64-bit Processors: 8 × Intel® Core™ i7-7820HQ CPU @ 2.90GHz Memory: 31.2 GiB of RAM Graphics Processor: Mesa Intel® HD Graphics 630

Additional context Connection appears to work fine without android-sdk-platform-tools-common installed but uninstalling android-sdk-platform-tools-common breaks MTP connection in Dolphin file manager.

CDrummond commented 3 years ago 
 error returned by libusb_claim_interface() = -6LIBMTP PANIC: Unable to initialize device

Looks like an MTP issue to me. I have not touched Cantata's MTP code in years. If it works without android-sdk-platform-tools-common then perhaps the issue is there? Looks like something has already connected to the device, so Cantata's connection fails.

Must admit MTP is awful, so I'd suggest using other methods.

CDrummond commented 3 years ago

Lots of issues reported about this on libmtp site - e.g. https://sourceforge.net/p/libmtp/bugs/1868/

anarchotaoist commented 3 years ago

ok, thanks.

anarchotaoist commented 3 years ago

Looks like something has already connected to the device

Update FYI

It would seem Dolphin (or Plasma) does not like to share mtp with more than one application. Cantata can use mtp no problem if I close out Dolphin, reboot then open Cantata. If Cantata has mtp control I then need to close Cantata and reboot in order to have connection with Dolphin. Opening Gwenview for photos is affected also. Unlike plugged in usb devices their is no option to unmount mtp in Plasma - well, no GUI way, I have placed a bug report with KDE as this looks to be an issue for Plasma and not Cantata.

Thanks again for looking at the issue Craig! Hopefully KDE sort it out!

vermeeren commented 3 years ago

@anarchotaoist Could you post the link to the issue you have reported?