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Re: (In)sane for Brother MFC-J6920DW (on slackware 14.1)

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JohnF <john@please.see.sig.for.email.com> wrote:
> The Natural Philosopher <tnp@invalid.invalid> wrote:
>> On 03/10/14 01:46, JohnF wrote:
>>> Having a bit of trouble correctly configuring scanning for
>>> Brother MFC-J6920DW connected wirelessly to a slackware 14.1 box.
>>> In particular, scanimage segfaults, though scanimage -L detects the
>>> device. I've done everything as correctly as I could figure out from
>>>    http://docs.slackware.com/howtos:hardware:brother_printer_installation
>>> and from the instructions at
>>>    http://support.brother.com/g/b/
>>> which are displayed while downloading the printer/scanner/fax stuff.
>>>    (By the way, those brother.com instructions display while downloading,
>>>     so for anybody who wants them, I cut-and-pasted them all at
>>>       http://www.forkosh.com/mfcinstallnotes.txt
>>>     which are specifically for the MFC-J6920DW, though lots of those
>>>     mfc printers are pretty similar.)
>>> Cups immediately added the printer, and printing works fine.
>>> And the scanner works "locally" when I plug in a (fat95-formatted)
>>> usb stick and walk it over to the pc after scanning images onto it,
>>> so I assume the hardware's okay.
>>>     And the sane stuff looks okay as far as I can tell, e.g.,
>>> brsaneconfig4 ran correctly, /etc/sane.d/dll.conf was correctly modified,
>>> etc. But scanimage segfaults. The scanner actually begins to scan,
>>> just barely, and then scanimage segfaults and the scanner resets itself.
>>> And a file containing 0 bytes is placed in ~/brscan/ .
>>> I messed around, but nothing had any effect on that behavior.
>>> Any suggestions how to proceed? Thanks,
>>>
>> 
>> Mmm. There's a gui scanner that uses very conservative defaults and 
>> tends to work better for me. SimpleScan is it?
>> I've seen stuff segfault on certain scan settings.
> 
> Googling  linux brother "simple-scan"  gets hits suggesting
> users are having similar problems with that package.
> Sane says brother scanners are "unsupported", but the above
> brother.com url lets you download drivers that they say will
> get the sane stuff working. But I'll give that simple-scan
> package a try if I can't get Brother's documented procedures
> working after a little more twiddling. If nothing else,
> maybe simple-scan will fail in some way that better hints
> at what's going wrong. Thanks,

Sorry for following myself up, but wanted to report that:
  o xsane actually "just works",
  o whereas  scanimage > out.pdf  continues to segfault.
Hadn't tried xsane previously, but figured I'd try it now,
before installing simple-scan, since xsane is already installed.

So what kind of resources/whatever could scanimage
be using/accessing/whatever that's causing it to segfault
(presumably because I configured something it needs wrong,
which xsane either doesn't need or can recover from gracefully)?

If you/anybody are familiar with Brother MFC-J6920DW, or similar,
other things that continue to fail, and hopefully provide
additional clues, are...
  o I ran brscan-skey, and set up profiles through the mfc's
    browser interface, but "scan to network" from printer's panel
    just sits there for ~60secs and then reports "Sending error".
    Not very informative.
  o When setting up profiles, printer asks if you want a
    "Test Scan to Network". It also sits there for ~60secs
    and then reports, "Test Error Sending Error, This message
    will appear when you cannot access the destination folder.
    Make sure that. *Directory name is correct. *Directory is write-enabled."
That suggests an obvious error. I chmod'ed all paths/directories to 777,
and ultimately gave the printer a directory name of just  tmp  and
mkdir'ed a ~/tmp under my own ~/home, so there'd be a /tmp and a ~/tmp
regardless of where the printer wanted to look for one. But no luck.
So I'm thinking maybe it needs some kind of backslashed C:\windows\path\
(which is why I just gave it  tmp  with no / or \), or maybe the diagnostic
message is wrong and the printer's not correctly reporting why the
test scan is failing.
-- 
John Forkosh  ( mailto:  j@f.com  where j=john and f=forkosh )

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(In)sane for Brother MFC-J6920DW (on slackware 14.1) JohnF <john@please.see.sig.for.email.com> - 2014-10-03 00:46 +0000
  Re: (In)sane for Brother MFC-J6920DW (on slackware 14.1) Dan Espen <despen@verizon.net> - 2014-10-02 22:17 -0400
  Re: (In)sane for Brother MFC-J6920DW (on slackware 14.1) The Natural Philosopher <tnp@invalid.invalid> - 2014-10-03 11:41 +0100
    Re: (In)sane for Brother MFC-J6920DW (on slackware 14.1) JohnF <john@please.see.sig.for.email.com> - 2014-10-03 11:41 +0000
      Re: (In)sane for Brother MFC-J6920DW (on slackware 14.1) JohnF <john@please.see.sig.for.email.com> - 2014-10-04 06:28 +0000
        Re: (In)sane for Brother MFC-J6920DW (on slackware 14.1) The Natural Philosopher <tnp@invalid.invalid> - 2014-10-04 09:39 +0100
          Re: (In)sane for Brother MFC-J6920DW (on slackware 14.1) JohnF <john@please.see.sig.for.email.com> - 2014-10-04 12:46 +0000
            Re: (In)sane for Brother MFC-J6920DW (on slackware 14.1) Robert Riches <spamtrap42@jacob21819.net> - 2014-10-05 03:08 +0000
              Re: (In)sane for Brother MFC-J6920DW (on slackware 14.1) JohnF <john@please.see.sig.for.email.com> - 2014-10-05 03:36 +0000
                Re: (In)sane for Brother MFC-J6920DW (on slackware 14.1) Robert Riches <spamtrap42@jacob21819.net> - 2014-10-05 03:43 +0000
                Re: (In)sane for Brother MFC-J6920DW (on slackware 14.1) JohnF <john@please.see.sig.for.email.com> - 2014-10-05 08:48 +0000
  Re: (In)sane for Brother MFC-J6920DW (on slackware 14.1) notbob <notbob@nothome.com> - 2014-10-03 16:26 +0000
    Re: (In)sane for Brother MFC-J6920DW (on slackware 14.1) John Forkosh <forkosh@panix.com> - 2014-10-04 04:06 +0000

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