On Sat, Jun 12, 2021 at 08:23:48AM -0300, Franz wrote:
> >
> >> take a look to the `qvm-pci` man page, it explains how to detach.
> >>
> >>
> >>
> > Many thanks it worked perfectly
> >
> 
> It worked perfectly for a week or so, then the mouse stopped working.
> Thomas at Vikings, who built the D8 computer with preinstalled coreboot,
> says it should be a Qubes issue.
> 
> How may I tell if it is a Qubes issue or a hardware issue?
> best
> 

You aren't clear on what is happened here, because you haven't provided
sufficient detail..
Do you mean that you allocated a USB controller to a sys-usb, to use
with the mouse. After a week, the mouse stopped working.
When both controllers were attached to a single usb-qube the mouse
worked without interruption.
Is that the position?

Did the other USB qube continue to work?
If you type lsusb in the "mouse"-usb do you see the mouse attached?
If you attach another usb device, does lsusb and dmesg show the device
being attached?
If you attach the mouse to the *other* usb qube, does it appear there?
If you revert to a single usb qube, does the mouse work for more than a
week there?
If you move the mouse to the other controller, does the mouse work for
more than a week?

Let's think about this.
Many Qubes users will be using coreboot.
Many Qubes users will be using more than one usb qube.
Many Qubes users use a usb mouse for more than one week without
incident.
What is different about you? Coreboot, Your hardware.
I am not saying that your hardware is at fault - it's just that the most
likely source is *your configuration and hardware in Qubes*.

Of course, if Vikings can point to other users with your hardware and
coreboot build who use Qubes without a problem, that would help too.

I would prepare another usb mouse, that can work with the other usb
qube. Use your mouse-usb qube until it "breaks". Plug the mouse in to
the other usb qube, and start looking at the "broken" usb qube.
Look in logs, for any events that might be associated with the loss of
mouse. Remove and reinsert the broken mouse to see how it is handled.
Remove and reinsert other usb devices to see how they are handled.
journalctl, dmesg are your friends, as well as basic troubleshooting.
(Another mouse, use the other controller, etc)


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