[sane-devel] Slow scanner & timeout

[m. allan noah]

2010/4/15 Erik Lotspeich <erik at lotspeich.org>:
> Hi Allan,
>
> Thanks for your response -- directing me to the sane source was a big
> help.  I was worried I'd have to get into the USB driver.
>
> I poked around in the source for a bit and discovered an environment
> variable SANE_HP_RDREDO.  I set this to 200 and that allowed sane to
> wait much longer -- I can get scans now with the XPA.

cool.

> When I used to use scanner with XPA with SCSI, it might take 1 minute
> for the lamp to warm up before the first scan and a much shorter time
> after that.  Now I'm waiting nearly 5 minutes... but that's not a
> problem with sane, I'm sure.  Maybe my 9-year old machine is showing
> signs of age.
>
> OT: When I bought this scanner, I thought that it would be a nice
> mid-range model.  When scanning slides, it's obvious it has a limited
> color/contrast range; I see banding and digital noise as well.  For
> negatives, it's worthless.

It was a nice mid-range scanner, 10 years ago :)

allan

>
> Regards,
>
> Erik
>
> m. allan noah wrote:
>> The HP 6x00 scanjets use ancient usb 1.0 (not even 1.1) IIRC. I had
>> lots of problems with this scanner on USB on every machine I tried.
>> Eventually I gave up and scrapped it. If you want to try and fix it, I
>> would get the source of sane-backends 1.0.20, and see if you can add
>> any calls to sanei_usb_set_timeout to the hp backend.
>>
>> allan
>>
>> On Wed, Apr 14, 2010 at 9:59 AM, Erik Lotspeich <erik at lotspeich.org> wrote:
>>> Hi,
>>>
>>> I have an HP ScanJet 6300c that I've been using successfully with sane
>>> for some time now.
>>>
>>> I have a problem when I use the XPA.  With the XPA, the scanner takes a
>>> LONG time (it waits for the XPA lamp to warm up) to handle scan
>>> requests.  The problem is that sane timeouts with an I/O error before
>>> the scanner is ready.  When the scanner is ready (you can hear it
>>> attempt to start the scan), sane is no longer listening.
>>>
>>> This scanner has both SCSI & USB interfaces.  I've used this scanner
>>> with XPA & sane many years ago with the SCSI interface -- it worked with
>>> SCSI.  I'm using the USB interface now.
>>>
>>> I did some searching on the Internet and I didn't see any definite
>>> answer.  I don't know if this is a sane issue or a USB one.  dmesg and
>>> /var/log/messages yield no error messages or warnings.
>>>
>>> I use OpenSUSE 11.1 with the following packages:
>>>
>>> # rpm -qa |grep sane
>>> sane-frontends-1.0.14-302.35
>>> xsane-0.995-131.35
>>> sane-backends-autoconfig-1.0.19-99.1
>>> sane-backends-1.0.19-99.1
>>>
>>> Any help would be greatly appreciated.
>>>
>>> Regards,
>>>
>>> Erik
>>>
>>> --
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>>>
>>
>>
>>
>



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