On 03/07/2018 10:24 PM, Glen H wrote:
Hi,
I'm using R4 (having never used R3) and trying to get my scanner working but it
stops scanning a page half way through. After debugging with the author of the
scanner software they say the program asks for 128 KBytes of data and the first
256 bytes of this data is dropped (lost).
To fix this I've tried:
1) Turning off USB 3.0 in BIOS (unfortunately this isn't really an option as
all the external ports are disabled). It doesn't revert back to USB 2.0
2) Set the ports to USB 2.0 via setpci:
```
lspci -nn | grep USB | cut -d '[' -f3 | cut -d ']' -f1 | xargs -I@ setpci -H1
-d @ d0.l=0
```
Unfortunately neither of those made a difference. Using the scanner/software
in Windows on a different computer works.
I'm currently running a Qubes backup and then I'll try installing Ubuntu and
see if that works. If so would seem to be related to Qubes.
Does anyone have any ideas? My laptop is a Dell e7440 with the latest BIOS.
Thanks,
Glen
Are you passing the device through to another VM?
The USB pass-through method has given me issues in the past for devices
that use a lot of bandwidth (webcams), though you are saying data is
lost after only a few bytes, I still might be suspect of the USB
passthrough system in qubes...
So if you ARE passing through you might want to try running the scanner
software directly from sys-usb to see if you can eliminate the USB
passthrough as a source of problems.
Ed
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