Re: Release a USB device?

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On Mon, 2019-12-02 at 20:11 +0800, Ed Greshko wrote:
> On 2019-12-01 22:03, Patrick O'Callaghan wrote:
> > On Sun, 2019-12-01 at 20:09 +0800, Ed Greshko wrote:
> > > On 2019-12-01 19:14, Patrick O'Callaghan wrote:
> > > > On Sun, 2019-12-01 at 14:04 +0800, Ed Greshko wrote:
> > > > > My system is a fully updated F31 running the KDE desktop.  It is the host, and I've got a qemu guest running
> > > > > F31 and the Xfce desktop.
> > > > > 
> > > > > I would like to test access to a Samsung phone on the guest connected via USB.
> > > > > 
> > > > > However, the host system grabs it and I can't seem to find a way to release it so the guest can access.
> > > > > There is no "eject" function in the "Device Notifier".  Nor is does there seem to be a way to tell
> > > > > KDE not to grab the device.
> > > > > 
> > > > > How to achieve the goal?
> > > > I use virt-manager. In the Preferences menu the options for New VM
> > > > include "Add Spice USB redirection - Yes", and my USB devices appear
> > > > automatically in the guest. Presumably that can be changed for existing
> > > > VMs as well.
> > > > 
> > > Sure, that is what I have.  But the VM can't obtain the Samsung phone because it is "in use" by the
> > > host.  Even if I check the box, I get an error.  The phone shows up in the Device Notifier of the host
> > > and I need it to be released and not show there.  I have no problem with flash drives and usb WiFi dongles.
> > Does it matter what mode the phone is in? As I'm sure you know, phones
> > can appear as either PTP (MTP) or storage devices, and behaviour may be
> > different in each case. Also, whether or not you have gvfs-mtp
> > installed (or configured) might make a difference one way or the other.
> > 
> > 
> FWIW, I think I have to copy /usr/lib/udev/rules.d/69-libmtp.rules to /etc/udev/rules.d/ and manipulate
> it in fashion such that the host doesn't grab it.  At least as a workaround for not having a way to release it.

Hmm. I haven't tried connecting a phone so presumably the existence of
that rules file mean they are treated specially.

poc
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