[sane-devel] I/O Errors with hp 7400c

Simon Matter simon.matter at invoca.ch
Thu Nov 3 05:37:37 UTC 2016

> Hello everybody,
> my HP scanjet 7400c worked nicely over many years with ubuntu.
> Now, for no reason I can see, it starts to throw I/O errors - the same
> on the desktop with ubuntu 16.10 and the laptop 16.04. - I suspect, it
> might be a hardware issue, but would be grateful for experts' hints
> before I trash the device.
> "scanimage -L" takes something like 20sec to provide a result, and
> scanning by "scanimage >test.pwm" takes around a minute to create any
> reaction, usually then it stops. All USB devices will be blocked then,
> I only can reboot the machine.
> On terminal, I can read "scanimage: sane_read: Error during device
> I/O". In these cases, a 0byte file is written. This happens mostly, not
> always, occasionally a successful scan happens.


There are/were some problems with USB3 and sane. Could it be that you're
using the scanner on an USB3 port?


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