File transfer by USB; tried pretty much everything and still no joy

hardtimes

n3t_admin Does that even appear

Yes, it all works as intended and even displays the 9a in the file manager. But a click on it sends it off for a minute and then comes back with the "unable to Mount..." error.

hardtimes

n3t_admin What does lsusb say?

Sorry, just got this.

Host works
Bus 001 Device 008: ID 18d1:4ee1 Google Inc. Nexus/Pixel Device (MTP)
Guest does not
Bus 002 Device 002: ID 18d1:4ee1 Google Inc. Nexus/Pixel Device (MTP)
Guest error "Failed to Open Pixel 9a MTP device"

n3t_admin

hardtimes Guest does no

Wait, let me clarify: are you trying to MTP into a guest profile on the Pixel itself? I must have missed that the first time reading. I can't test if that even works properly at all... at least it never worked for me afair.

Someone with current access to GOS should test that out.

hardtimes

n3t_admin are you trying to MTP into a guest profile on the Pixel itself?

Nope. The pixel is regarded as a USB-device and I use "Redirect USB device" to assign it to the Guest. Then, I need to manipulate files on the 9a from the Guest OS file manager. Pretty standard stuff and as mentioned, the 4a and 2 Motorola are fine with it and have been for years.

Whatever it is, it is the 9a firmware. Especially so now that the the Host can connect OK.

Why the Host can now see it is a mystery, but maybe connecting to the win-10 laptop which worked fine and that set or reset something in the 9a and now the 9a is happy with the Host system at least.

The 9a is probably trying to do something at the bare-metal level within the Guest and it ain't there, but it is with the Host.

n3t_admin

hardtimes ahh gotcha. You meant from inside a VM. The main question is: is this really a GrapheneOS issue or rather an Android 16 issue?

I am not sure honestly, since Graphene doesn't really touch the MTP code... just the USB-port controls could be related (but I also fail to see how).

Can't be of much help, sorry :/

maximus87

Just 2 days ago, I was trying to copy some files into my 9 using OpenSuse Tumbleweed, and it kept disconnecting and I thought I was going crazy. I needed multiple tries until it finished copying before the next disconnection happened.

hardtimes

maximus87 kept disconnecting

Welcome to my world. But, my disconnects are instant. Well, about 2-seconds. It boings, flashes and connects then drops it again. Albeit staying visible in the file manager all the while. Or it instantly goes off for about a minute the declares the "can't open..."

hardtimes

n3t_admin is this really a GrapheneOS issue or rather an Android 16 issue?

I have no idea either, but I am skeptical of it being a v16 issue as it connects OK with the Host. It's the same OS on both Guest and Host. The lsusb sees it as a valid USB device in both Guest and Host.

I am reluctant to go back to Stock Android just to see. Still kinda feel it's a 9a GOS thing.

BeepBeep

I've done this in the past, no problems. But recently I tried to connect via USB and couldn't. I figured it was me somehow. Pixel 7 Pro, updated.

hardtimes

BeepBeep figured it was me somehow. Pixel 7 Pro, updated.

{grin} been there too. But at least the Host VM can see the 9a, not prefect, but acceptable -- for now??

BeepBeep

For people running into this problem, here's something to try...

(1) In your Admin profile, under "Developer Options", change the "Default USB configuration" option to "File Transfer". Then, connect your USB cable.

(2) If you are trying to port data to/from a subordinate profile, change to the desired profile, sign in, and then connect USB cable.

(3) In the Settings menu, under "USB Preferences", select "USB Controlled by..." to be "This Device" and then under "Use USB for" select "File Transfer".

Note: If this option is greyed-out, first switch "USB controlled by" to be "Connected device" and then back to "This device". This should hopefully remove the grey-out.

(4) After data transfer, remember to change "Use USB for" back to "No data transfer", and don't forget to revert your "Default USB configuration" in the Developer Options of the Admin profile back to "No data transfer".

Hope this helps someone

jacksonppp

BeepBeep

This was roughly the way i managed to get a usb connection and file transfer (with openmtp) working 3 out of 5 times.
It was still hit or miss to get the connection up and running. Once it was on it worked.

Activation in the Owner (Admin) profile settings seemed important. Then switching back to profile

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