[sane-devel] Error: Canon Pixma MG7550 hangs

[Martin]

Am Samstag, 3. Januar 2015, 11.16:10 schrieb Louis Lagendijk:
> On Fri, 2015-01-02 at 22:59 +0100, Martin wrote:
> > Hi Troels
> > 
> > > *Is it USB3 (on the computer)?
> > 
> > no, it is USB2
> > 
> > > *Do you have access to another computer, where you can try it - Does it
> > > work excactly the same strange way ... ?
> > 
> > No,I don't have access to another computer. But I have also Windows 7
> > installed. With Windows 7 and the Canon-software it works OK.
> > 
> > > *Does unit have ethernet connection / can you try that way?
> > 
> > Yes. With the ethernet connection the printer works. Thus the IP-address
> > below is correct.
> > But I cannot access the scanner.
> > 
> > 	xsane pixma:MG7500_192.168.0.3
> > 
> > results in the error message "illegal argument". Same thing with
> > 
> > 	scanimage --help -d bnjp://192.168.0.3:8612
> 
> Hi Martin
> If the scanner does not work on a USB port it is quite unlikely to work
> over the network: the bjnp network code just carries the USB exchange
> over IP.
> Anyhow, you can find the name with scanimage -L (but make sure that port
> 8612 is not blocked by a firewall (see the man-page for sane-pixma in
> the latest sources from GIT. you need to enable port 8612 for both
> incoming and outgoing traffic.
> 
> Louis

Hi Louis

The necessary ports on the firewall are open, yet scanimage -L does not find 
the scanner.

But this lead to another discovery:
I enabled LAN on the MG7550. And although the unit is connected via USB 2 
xsane sometimes works?! But with LAN disabled xsane never works without prior 
scanimage -T. And once xsane or scanimage -T failed all succeeding calls fail 
until the scanner is switched off and on again.

Log of xsane working:
[sanei_debug] Setting debug level of pixma to 21.
[pixma] pixma is compiled with pthread support.
[pixma] pixma version 0.17.13
[pixma] pixma_collect_devices() found Canon PIXMA MG7500 Series at 
libusb:001:007
[pixma] pixma_find_scanners() found 1 devices
[pixma] pixma_collect_devices() found Canon PIXMA MG7500 Series at 
libusb:001:007
[pixma] pixma_open(): Canon PIXMA MG7500 Series
[pixma] *mp150_open***** This is a generation 4 scanner.  *****
[pixma] [pixma] Reader task id=139772037314304 (threaded)
Reader task started
[pixma] 
[pixma] pixma_scan(): start
[pixma]   line_size=4605 image_size=4895115 channels=3 depth=8
[pixma]   dpi=300x300 offset=(0,0) dimension=1535x1063
[pixma]   gamma_table=0x1f201e0 source=0
[pixma]   threshold=127 threshold_curve=0
[pixma]   ADF page count: 0
[pixma] OUT  T=58.770 len=288
[pixma]  00000000:3c 3f 78 6d 6c 20 76 65  72 73 69 6f 6e 3d 22 31 
[pixma]  00000010:2e 30 22 20 65 6e 63 6f  64 69 6e 67 3d 22 75 74 
...
Log of xsane not working:
pixma] pixma_collect_devices() found Canon PIXMA MG7500 Series at 
libusb:001:008
[pixma] pixma_find_scanners() found 1 devices
[pixma] pixma_collect_devices() found Canon PIXMA MG7500 Series at 
libusb:001:008
[pixma] pixma_open(): Canon PIXMA MG7500 Series
[pixma] *mp150_open***** This is a generation 4 scanner.  *****
[pixma] INTR T=1.249 len=32
[pixma]  00000000:00 00 00 01 00 00 00 00  00 00 00 00 00 00 00 00 
[pixma]  00000010:00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 
[pixma] 
[pixma] Sending time: '15/01/03 15:32'
[pixma] OUT  T=1.250 len=36
[pixma]  00000000:eb 80 00 00 00 00 00 00  00 00 00 00 00 00 00 14 
[pixma]  00000010:31 35 2f 30 31 2f 30 33  20 31 35 3a 33 32 00 00 
[pixma]  00000020:00 00 00 53 
[pixma] 
[pixma] IN   T=21.251 len=-9
[pixma]   ERROR: ETIMEDOUT
[pixma] 
...

Martin