Losing scanner after idle time..

[Anakunda]

Greetings,

I have a trouble with my scanner connected via USB2. When attached to USB port, it is detected fine and works and everything is fine. But after longer period of being not used, the scanner looks as not connected at all (full computer restart doesnot fix this) - not responsible to pressing buttons on the scanner, not responsible to scanning request. Only what makes it reactivate is physical unplugging/replugging the USB cord. Firstly I thought that it relates tom some USB power saving feature but finally I don't think so, beside it other devices plugged to the same hub don't fall into this deep sleep, ie. they are ready even after longer time being idle (printer for exaple).
Just for the record in Power management advanced settings optional suspension of USB devices is Enabled but I don't think this does matter (I don't want to disable it anyway).
I find this considerably uncomfortable, any sign of this issue can get resolved?

 

[Dave Atkin]

Idle Time

How long untill the scanner goes idle?

Disable Power management advanced settings optional suspension of USB devices as a test.. You can always re-activate it.

It does sound like this is the problem though. Disabling the USB's power management will probably fix the problem.

See:
Managing Devices


Dave

 

[Anakunda]

Ok, I try it but as I wrote I wouldnot like to disable USB power management (laptop computer)

How long untill the scanner goes idle?Dave

Approx after 1-2 days of not being used.

 

[Dave Atkin]

Thats normal .

I did read that you didnt want to disable it but without doing so I dont think there will be a way around the problem.


Dave

 

[Anakunda]

Then I think that USB power saving mode is malfunction as it only should standby connected devices, not fully turn them off.

 

[Anakunda]

Disable Power management advanced settings optional suspension of USB devices as a test.. You can always re-activate it.Dave

I have tested with disabled PM in longer period and must confirm the scanner losing even with disabled USB standby..

The scanner lost again after about 3 days of not being used.
If that does matter the scanner is powered from USB (no own power supply). It might to stop responding once the USB port stops delivering voltage (it is connected to active external hub with independent power input so it should be supplied current continuously)

 

[Dave Atkin]

Hello,

Can you plug it into your PC directly to test the USB hub? It could be that the hub is faulty.



Dave