Comment 71 for bug 1314556

I also get this message all the time with my Nexus 5. Typically, I get the "Unable to mount Android MTP device" error message popping up on my screen when I plug in my phone, but *not* always. Since I plug/unplug my phone very often, I typically get 4-5 of these messages hidden behind windows that I have to clear throughout the day. I haven't been able to isolate the cause, but for example right at this moment, I am unable to reproduce it, even though I just had to clear away a stale error message.

I should also add that it works perfectly with ADB, which is what I normally use to transfer files, but I can also turn on MTP. Whenever the phone is plugged-in, it defaults to charging-only mode. I still do get an icon for it, but clicking on it just shows an empty mtp:// folder. I'm able to "mount"/unmount this device, but the folder stays empty—not sure that anything is really happening. If I turn on "Use USB for File transfers" on my device, then the "Internal Storage" icon appears inside the mtp:// folder and I can browse files normally.

I just want to isolate / eliminate all the useless error messages. Not sure if this should be split out into a separate bug, since a lot of people seem to be complaining about lack of MTP functionality entirely.