[sane-devel] Slow scanner & timeout
m. allan noah
kitno455 at gmail.com
Thu Apr 15 13:17:08 UTC 2010
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.
> 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 :)
> 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.
>> On Wed, Apr 14, 2010 at 9:59 AM, Erik Lotspeich <erik at lotspeich.org> wrote:
>>> 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
>>> Any help would be greatly appreciated.
>>> sane-devel mailing list: sane-devel at lists.alioth.debian.org
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>>> to sane-devel-request at lists.alioth.debian.org
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