[sane-devel] Canon PIXMA MX890

Gernot Hassenpflug aikishugyo at gmail.com
Wed Oct 3 03:55:42 UTC 2012

On Wed, Oct 3, 2012 at 12:49 PM, Henry Ptasinski <henry at logout.com> wrote:
> On 10/02/2012 09:43 PM, Gernot Hassenpflug wrote:
>> On Wed, Oct 3, 2012 at 12:31 PM, Henry Ptasinski <henry at logout.com> wrote:
>>> On 10/02/2012 10:22 AM, Gernot Hassenpflug wrote:
>>>> On Tue, Oct 2, 2012 at 11:50 PM, Henry Ptasinski <henry at logout.com>
>>>> wrote:
>>>> Could you ensure that the pixma driver backend works properly for all
>>>> resolutions and also ADF, by attaching via USB.
>> Can you set the debug to higher to see what the pixma commands being
>> sent are?
> What level would be appropriate, 21 or something else?

3 should be fine.

>> Obviously the command set is in general correct, else you
>> could not scan at all.
>> Perhaps the scanner needs an exception set for a few more bytes in the
>> command set. But that would only be know if we can get USB sniffs of
>> Windows scans. So defer to later.
>> First, which scans succeed, which fail?
> There didn't seem to be a pattern of dpi and/or mode that failed, but of the
> 6 scans I tried the 1st, 3rd, and 5th failed which seems noteworthy.  I'm
> running the scans from a script with a 10 sec delay between each scan.
> I'll run some more and see if it's consistently every-other-scan that's
> having trouble.

If you scan without a script, can you get all scans to succeed?

1) For the driver, I am primarily interested in knowing if all the
resolutions and modes, work, or whether there is some mode that needs
programming to get the image correct.

2) with debug messages, we can tell if there is a problem with
timeouts, or resets.

3) the network backend part probably requires more work, and further
debug. I'm not familiar with it though.


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