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Device not found

Subscribe to Device not found 14 posts, 7 voices

 
Jan 9, 2018 8:45pm
Avatar Rick Murray (539) 7571 posts

I sporadically see this when rebooting my machine. It’s quite likely something of mine, however the problem is that “Device not found” is not terribly descriptive. It’s there a way to report “Device <blah> not found” or somesuch?

 
Jan 9, 2018 9:02pm
Avatar John Williams (567) 635 posts

De vice is in das workshop?

 
Jan 9, 2018 10:44pm
Avatar Chris Johnson (125) 594 posts

I get it almost every time I shut down, on both the ARMX6 and the IGEPv5. The only time I might not get it is if I have used booted one machine and not accessed the NAS. It would appear to be related to usb devices, although that could include networking as well of course.

I just ignore it.

 
Jan 10, 2018 10:17am
Avatar Colin (478) 1915 posts

Rick

Is that at shutdown or startup?

I get it occasionally at shut down on my ARMX6 – usually after testing usb stuff. For what it is worth it’s ErrorBlock_DeviceFS_DeviceNotKnown and occurs if a device is deregistered with DeviceFS more than once or the swi DeviceFS_CallDevice is used after a device has been deregistered with DeviceFS.

I can’t see that the network on an ARMX6 is involved as it doesn’t use DeviceFS. The IGEPv5 does use EtherUSB.

The problem has to be either a usb based module or a serial based module.

 
Jan 10, 2018 10:29am
Avatar Grahame Parish (436) 139 posts

I’ve seen the message on shutdown, and I think it may be related to using a USB KVM. If you switch to and from the RISC OS machine during a session I don’t think it reuses the same handle when the keyboard/mouse are disconnected/reconnected via the KVM. Now I mostly only use the KVM for the monitor in RISC OS, but continue to use it fully with other computers and I no longer see the message

 
Jan 10, 2018 10:47am
Avatar Chris Johnson (125) 594 posts

I think it may be related to using a USB KVM.

That is certainly possible. I use an old Belkin KVM to switch only a wireless mouse/keyboard between ARMX6 and IGEPv5. When I only boot the ARMX6, then the KVM is never switched. I do not see the message at closedown if I only fireup the ARMX6.

 
Jan 10, 2018 10:50am
Avatar Rick Murray (539) 7571 posts

Pi1 and now Pi2, at shutdown.
Don’t have a KVM.

 
Jan 10, 2018 10:53am
Avatar Rick Murray (539) 7571 posts

And since there’s no reporting, no address, no backtrace, and no UI… It’s kind of hard to work out what’s causing this…

 
Jan 10, 2018 12:15pm
Avatar John Rickman (71) 163 posts
think it may be related to using a USB KVM.

No KVM but get "Device not found” when I have been using USB devices.

 
Jan 13, 2018 4:23pm
Avatar Chris Johnson (125) 594 posts

When I power up and use only the ARMX6, I do not get the ‘Device not found error’ when closing down. If I power up only the ARMX6, use the KVM to switch the mouse/keyboard away from the ARMX6 (the other machine connected to the KVM is unpowered), wait a few seconds and switch back again, then doing a closedown results in the error message being shown. Thus it looks as if one reason for getting the message is use of a usb KVM.

 
Jan 14, 2018 1:02pm
Avatar Evan Clark (3437) 1 post

I’ve been seeing this since installing HID on an Iyonix over ten years ago, and also now on an ARMX6. It seems that if a USB device is unplugged then plugged in again, HID opens a new device handle but doesn’t close the old one. Try using CloseFile or similar to see the effect. It seems quite benign, so I’ve never reported it.

 
Jan 14, 2018 3:02pm
Avatar Chris Johnson (125) 594 posts

HID opens a new device handle but doesn’t close the old one

Now that could be it. I use HID. I now see that switching keyboard/mouse away and back again opens three new endpoints, and does it every time.

 
Jan 14, 2018 10:23pm
Avatar Grahame Parish (436) 139 posts

I also use HID, so that may well be the problem I’m seeing too.

 
Jan 14, 2018 11:03pm
Avatar Rick Murray (539) 7571 posts

I don’t use HID. Found it too crashy. So…

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  • Rick Murray (539)
  • John Williams (567)
  • Chris Johnson (125)
  • Colin (478)
  • Grahame Parish (436)
  • John Rickman (71)
  • Evan Clark (3437)

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