Re: Canoscan Lide 210 Scanner
See the following bug report
https://bugs.launchpad.net/ubuntu/+source/xsane/+bug/1247371
There seems to be a problem with USB 3. I have the same scanner (210) but the error doesn't occur after each scan, it seems to be more irregular, but certain settings (resolution, color depth, ...) can force it. Since you mentioned that it works fine when plugged it in USB 2 I will check which USB port I'm currently using this evening (my desktop has both of them).
Le 30 oct. 2014 à 09:56, Joe <joe@jretrading.com> a écrit :
> On Thu, 30 Oct 2014 09:16:42 +0200
> Johann Spies <johann.spies@gmail.com> wrote:
>
>> This is not Debian specific, but as I experienced it on Debian and
>> initially thought that it might be a Debian problem, it may help some
>> other users.
>>
>> I recently bought the scanner specified in the subject line after
>> reading that the saned team claims it has "complete" support. I
>> first tried it out on my Desktop which has something like 8 usb2
>> ports. I had limited success and was frustrated. Then I took it to
>> work and tested it with my work laptop with 4 usb2 ports and it
>> worked without a problem.
>>
>> At home I tested it on my other Debian laptop which have two
>> usb3-ports and two usb2 ports. On the USB-3 port I experienced the
>> same problems I had on my Desktop. Moving the connection to a
>> usb2-port everything worked as expected.
>>
>> My thought on this is that on the Desktop there was not enough power
>> coming through the usb-port and on the usb3-port there the power was
>> too much.
>
> It is astronomically unlikely that the USB supply voltage would be too
> high, as almost certainly, the same supply is used inside the computer,
> and a 5 Volt rail can't go any higher than 5.25 before other things
> will stop working.
>>
>> This scanner only works with the electricity it gets through the
>> usb-connection.
>>
> Something you could try is a powered USB hub, using a separate 5 Volt
> supply. If the scanner works through the hub on the problem machine(s)
> with external power applied but not without it, it's pretty certain
> that's the answer. Computer USB ports are not all equal in terms of the
> maximum current available, and at the moment, this does look the most
> likely answer. I'm assuming you're using the same USB cable for all the
> tests, at least on USB2, as scanners do shift a fair amount of data and
> all USB cables aren't created equal, either.
>
> I have two devices that came with USB cables with two type-A connectors
> fitted at one end, as the 'guaranteed' minimum of 100mA from one port
> isn't enough for them. But I've still had trouble, so I use them
> through a powered hub every time now.
>
> --
> Joe
>
>
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