Has anyone ever made scanning work?

[Robert]

Mikkel L. Ellertson wrote:
> Robert wrote:
>> I got to this party late but thought it might be worthwhile to mention
>> this.
>> I put a Canoscan LIDE 35 that has been collecting dust on an old P3
>> machine and it "just worked".  I moved it in to this machine, where I
>> really wanted it, and it "JUST BECAME VERY INTERMITTENT". No external
>> hub, no root hub port seemed to make any difference -- until I bought an
>> externally-powered hub to drive the scanner.  Shazam! It hasn't missed a
>> beat since.
>> Obviously, the bus-supplied power from this m/b,p/s combination was
>> marginal.
>> The m/b that worked 100% - ASUS P3V4X Rev 1.xx
>> Intermittent m/b - ASUS A7N8X Deluxe Ver 2
>> Both with commodity p/s mfg by Obscurename, Ltd.
>>
> Just a stray thought - check the A7N8X to see if there are jumpers
> to select where the USB ports get their power. There may be a choice
> between +5 and +5VSB - if jumpered for +5VSB there may not be enough
> power for the everything connected to the USB bus. (There may be
> more then one jumper, for different USB connectors.) Just be aware
> that changing the jumper to +5 will disable the ability of USB
> devices plugged into that port from waking the system from suspend.
> 
> Mikkel
> 
Good catch; thanks!  Yes, the option is available and there are multiple 
jumpers, as you suggested. I haven't looked at the jumpers yet but based 
on this excerpt from the manual, indicating that the default is +5V, I 
doubt that it/they has/have been changed because I had zero USB devices 
when I bought this m/b.   Manual sez:

3) USB Device Wake-up (2x3 pin USBPWR12, 34, 56)
Set these jumpers to +5V to allow wake up from the S1 sleep state (CPU 
stopped; RAM refreshed; system running in low power mode) using the 
connected USB devices. Set to +5VSB to allow wake up from S3 sleep state 
(no power to CPU; RAM in slow refresh; power supply in reduced power 
mode). The default setting for the three jumpers is 1-2 to select +5V 
(because not all computers have the appropriate power supply).