2 additional informations :

1st time I launch simple-scan, it takes forever to appear. cf log
obtained by simplescan -d :


$ simple-scan -d
[+0.00s] DEBUG: simple-scan.vala:582: Starting Simple Scan 3.10.0, PID=11029
[+0.00s] DEBUG: Connecting to session manager
[+0.66s] WARNING: g_object_set_valist: invalid object type 'GtkAdjustment' for 
value type 'GtkWidget'
[+0.69s] DEBUG: ui.vala:1513: Restoring window to 600x400 pixels
[+0.69s] DEBUG: ui.vala:1518: Restoring window to maximized
[+0.77s] DEBUG: autosave-manager.vala:127: Found at least one autosave page, 
taking ownership

[+554.56s] DEBUG: autosave-manager.vala:481: Found a page that needs to be 
recovered
[+554.57s] DEBUG: autosave-manager.vala:497: Restoring a page of size 2549 x 
4500
[+554.84s] DEBUG: autosave-manager.vala:528: Updating autosave to point to our 
new copy of the page
[+572.94s] DEBUG: autosave-manager.vala:481: Found a page that needs to be 
recovered
[+572.94s] DEBUG: autosave-manager.vala:497: Restoring a page of size 2549 x 
4500
[+573.10s] DEBUG: autosave-manager.vala:528: Updating autosave to point to our 
new copy of the page
[+613.75s] DEBUG: autosave-manager.vala:481: Found a page that needs to be 
recovered
[+613.75s] DEBUG: autosave-manager.vala:497: Restoring a page of size 2549 x 
4500
[+613.90s] DEBUG: autosave-manager.vala:528: Updating autosave to point to our 
new copy of the page
[+628.54s] DEBUG: autosave-manager.vala:481: Found a page that needs to be 
recovered
[+628.54s] DEBUG: autosave-manager.vala:497: Restoring a page of size 2549 x 
4500
[+628.69s] DEBUG: autosave-manager.vala:528: Updating autosave to point to our 
new copy of the page
[+639.48s] DEBUG: autosave-manager.vala:481: Found a page that needs to be 
recovered
[+639.48s] DEBUG: autosave-manager.vala:497: Restoring a page of size 2549 x 
4500
[+639.63s] DEBUG: autosave-manager.vala:528: Updating autosave to point to our 
new copy of the page
[+645.31s] DEBUG: autosave-manager.vala:481: Found a page that needs to be 
recovered
[+645.31s] DEBUG: autosave-manager.vala:497: Restoring a page of size 2549 x 
4500
[+645.47s] DEBUG: autosave-manager.vala:528: Updating autosave to point to our 
new copy of the page
[+650.62s] DEBUG: autosave-manager.vala:481: Found a page that needs to be 
recovered
[+650.62s] DEBUG: autosave-manager.vala:497: Restoring a page of size 2549 x 
4500
[+650.77s] DEBUG: autosave-manager.vala:528: Updating autosave to point to our 
new copy of the page
[+662.08s] DEBUG: autosave-manager.vala:481: Found a page that needs to be 
recovered
[+662.08s] DEBUG: autosave-manager.vala:497: Restoring a page of size 2549 x 
4500
[+662.25s] DEBUG: autosave-manager.vala:528: Updating autosave to point to our 
new copy of the page
[+667.88s] DEBUG: autosave-manager.vala:481: Found a page that needs to be 
recovered
[+667.88s] DEBUG: autosave-manager.vala:497: Restoring a page of size 2549 x 
4500
[+668.04s] DEBUG: autosave-manager.vala:528: Updating autosave to point to our 
new copy of the page
[+673.30s] DEBUG: autosave-manager.vala:481: Found a page that needs to be 
recovered
[+673.30s] DEBUG: autosave-manager.vala:497: Restoring a page of size 2549 x 
4500
[+673.45s] DEBUG: autosave-manager.vala:528: Updating autosave to point to our 
new copy of the page
[+678.21s] DEBUG: autosave-manager.vala:481: Found a page that needs to be 
recovered
[+678.21s] DEBUG: autosave-manager.vala:497: Restoring a page of size 2549 x 
4500
[+678.38s] DEBUG: autosave-manager.vala:528: Updating autosave to point to our 
new copy of the page
[+683.62s] DEBUG: autosave-manager.vala:481: Found a page that needs to be 
recovered
[+683.62s] DEBUG: autosave-manager.vala:497: Restoring a page of size 2549 x 
4500
[+683.77s] DEBUG: autosave-manager.vala:528: Updating autosave to point to our 
new copy of the page
[+694.40s] DEBUG: autosave-manager.vala:481: Found a page that needs to be 
recovered
[+694.40s] DEBUG: autosave-manager.vala:497: Restoring a page of size 2549 x 
4500
[+694.55s] DEBUG: autosave-manager.vala:528: Updating autosave to point to our 
new copy of the page
[+700.26s] DEBUG: autosave-manager.vala:481: Found a page that needs to be 
recovered
[+700.26s] DEBUG: autosave-manager.vala:497: Restoring a page of size 2549 x 
4500
[+700.41s] DEBUG: autosave-manager.vala:528: Updating autosave to point to our 
new copy of the page

and still going on until it recovers a previous scan, which I do not
really need ....

But I guess this issue is not impacting. I can launch a second "simple-
scan -d" and kill the first one.

Then I try to scan all pages in feeder, I get the following debugging
log :

simple-scan -d
[+0.00s] DEBUG: simple-scan.vala:582: Starting Simple Scan 3.10.0, PID=11082
[+0.00s] DEBUG: Connecting to session manager
[+0.75s] WARNING: g_object_set_valist: invalid object type 'GtkAdjustment' for 
value type 'GtkWidget'
[+0.76s] DEBUG: ui.vala:1513: Restoring window to 600x400 pixels
[+0.76s] DEBUG: ui.vala:1518: Restoring window to maximized
[+0.79s] WARNING: autosave-manager.vala:162: Error 1 while preparing statement
[+0.79s] DEBUG: autosave-manager.vala:332: Adding an autosave for a new page
[+0.79s] WARNING: autosave-manager.vala:356: Error 5 while executing query
[+0.79s] DEBUG: autosave-manager.vala:332: Adding an autosave for a new page
[+0.79s] WARNING: autosave-manager.vala:356: Error 5 while executing query
[+1.87s] DEBUG: autosave-manager.vala:383: Updating the autosave for a page
[+1.94s] DEBUG: scanner.vala:1431: sane_init () -> SANE_STATUS_GOOD
[+1.94s] DEBUG: scanner.vala:1437: SANE version 1.0.23
[+1.94s] DEBUG: scanner.vala:1498: Requesting redetection of scan devices
[+1.94s] DEBUG: scanner.vala:776: Processing request
[+2.03s] WARNING: 
(/home/bob/bzr/simple-scan/trunk/src/autosave-manager.vala:440):autosave_manager_real_update_page:
 runtime check failed: (_tmp100_ == SQLITE_DONE)
[+10.68s] DEBUG: scanner.vala:338: sane_get_devices () -> SANE_STATUS_GOOD
[+10.68s] DEBUG: scanner.vala:350: Device: 
name="hpaio:/usb/Officejet_6300_series?serial=CN814FB1Y304J5" 
vendor="Hewlett-Packard" model="Officejet_6300_series" type="all-in-one"
[+55.00s] DEBUG: simple-scan.vala:310: Requesting scan at 300 dpi from device 
'hpaio:/usb/Officejet_6300_series?serial=CN814FB1Y304J5'
[+55.00s] DEBUG: scanner.vala:1544: Scanner.scan 
("hpaio:/usb/Officejet_6300_series?serial=CN814FB1Y304J5", dpi=300, 
scan_mode=ScanMode.COLOR, depth=8, type=ScanType.ADF_BOTH, paper_width=0, 
paper_height=0, brightness=0, contrast=0)
[+55.00s] DEBUG: scanner.vala:776: Processing request
[+57.16s] DEBUG: scanner.vala:837: sane_open 
("hpaio:/usb/Officejet_6300_series?serial=CN814FB1Y304J5") -> SANE_STATUS_GOOD
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (0)
[+57.16s] DEBUG: scanner.vala:708: Option 0: title='Number of options' type=int 
size=4 cap=,soft-detect
[+57.16s] DEBUG: scanner.vala:711:   Description: Read-only option that 
specifies how many options a specific devices supports.
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (1)
[+57.16s] DEBUG: scanner.vala:708: Option 1: name='(null)' title='Scan mode' 
type=group size=0
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (2)
[+57.16s] DEBUG: scanner.vala:708: Option 2: name='mode' title='Scan mode' 
type=string size=20 values=["Lineart", "Gray", "Color"] 
cap=,soft-select,soft-detect
[+57.16s] DEBUG: scanner.vala:711:   Description: Selects the scan mode (e.g., 
lineart, monochrome, or color).
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (3)
[+57.16s] DEBUG: scanner.vala:708: Option 3: name='resolution' title='Scan 
resolution' type=int size=4 unit=dpi values=[75, 100, 150, 200, 300, 600] 
cap=,soft-select,soft-detect
[+57.16s] DEBUG: scanner.vala:711:   Description: Sets the resolution of the 
scanned image.
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (4)
[+57.16s] DEBUG: scanner.vala:708: Option 4: name='(null)' title='Advanced' 
type=group size=0 cap=,advanced
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (5)
[+57.16s] DEBUG: scanner.vala:708: Option 5: name='contrast' title='Contrast' 
type=int size=4 min=-127, max=127, quant=0 cap=,soft-select,soft-detect,advanced
[+57.16s] DEBUG: scanner.vala:711:   Description: Controls the contrast of the 
acquired image.
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (6)
[+57.16s] DEBUG: scanner.vala:708: Option 6: name='brightness' 
title='Brightness' type=int size=4 min=-127, max=127, quant=0 
cap=,soft-select,soft-detect,advanced
[+57.16s] DEBUG: scanner.vala:711:   Description: Controls the brightness of 
the acquired image.
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (7)
[+57.16s] DEBUG: scanner.vala:708: Option 7: name='compression' 
title='Compression' type=string size=20 values=["None", "JPEG"] 
cap=,soft-select,soft-detect,advanced
[+57.16s] DEBUG: scanner.vala:711:   Description: Selects the scanner 
compression method for faster scans, possibly at the expense of image quality.
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (8)
[+57.16s] DEBUG: scanner.vala:708: Option 8: name='jpeg-quality' title='JPEG 
compression factor' type=int size=4 min=0, max=100, quant=0 
cap=,soft-select,soft-detect,advanced
[+57.16s] DEBUG: scanner.vala:711:   Description: Sets the scanner JPEG 
compression factor. Larger numbers mean better compression, and smaller numbers 
mean better image quality.
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (9)
[+57.16s] DEBUG: scanner.vala:708: Option 9: name='batch-scan' title='Batch 
scan' type=bool size=4 cap=,soft-select,soft-detect,advanced
[+57.16s] DEBUG: scanner.vala:711:   Description: Enables continuous scanning 
with automatic document feeder (ADF).
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (10)
[+57.16s] DEBUG: scanner.vala:708: Option 10: name='source' title='Scan source' 
type=string size=20 values=["Auto", "Flatbed", "ADF"] 
cap=,soft-select,soft-detect,advanced
[+57.16s] DEBUG: scanner.vala:711:   Description: Selects the scan source (such 
as a document-feeder).
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (11)
[+57.16s] DEBUG: scanner.vala:708: Option 11: name='duplex' title='Duplex' 
type=bool size=4 cap=,soft-select,soft-detect,advanced
[+57.16s] DEBUG: scanner.vala:711:   Description: Enables scanning on both 
sides of the page.
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (12)
[+57.16s] DEBUG: scanner.vala:708: Option 12: name='(null)' title='Geometry' 
type=group size=0 cap=,advanced
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (13)
[+57.16s] DEBUG: scanner.vala:708: Option 13: name='length-measurement' 
title='Length measurement' type=string size=20 values=["Unknown", 
"Approximate", "Padded"] cap=,soft-select,soft-detect,advanced
[+57.16s] DEBUG: scanner.vala:711:   Description: Selects how the scanned image 
length is measured and reported, which is impossible to know in advance for 
scrollfed scans.
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (14)
[+57.16s] DEBUG: scanner.vala:708: Option 14: name='tl-x' title='Top-left x' 
type=fixed size=4 unit=mm min=0.000000, max=215.899994, quant=0 
cap=,soft-select,soft-detect
[+57.16s] DEBUG: scanner.vala:711:   Description: Top-left x position of scan 
area.
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (15)
[+57.16s] DEBUG: scanner.vala:708: Option 15: name='tl-y' title='Top-left y' 
type=fixed size=4 unit=mm min=0.000000, max=381.000000, quant=0 
cap=,soft-select,soft-detect
[+57.16s] DEBUG: scanner.vala:711:   Description: Top-left y position of scan 
area.
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (16)
[+57.16s] DEBUG: scanner.vala:708: Option 16: name='br-x' title='Bottom-right 
x' type=fixed size=4 unit=mm min=0.000000, max=215.899994, quant=0 
cap=,soft-select,soft-detect
[+57.16s] DEBUG: scanner.vala:711:   Description: Bottom-right x position of 
scan area.
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (17)
[+57.16s] DEBUG: scanner.vala:708: Option 17: name='br-y' title='Bottom-right 
y' type=fixed size=4 unit=mm min=0.000000, max=381.000000, quant=0 
cap=,soft-select,soft-detect
[+57.16s] DEBUG: scanner.vala:711:   Description: Bottom-right y position of 
scan area.
[+57.16s] DEBUG: scanner.vala:858: sane_get_option_descriptor (18)
[+57.16s] DEBUG: scanner.vala:520: sane_control_option (10, 
SANE_ACTION_SET_VALUE, "ADF") -> (SANE_STATUS_GOOD, "ADF")
[+57.16s] DEBUG: scanner.vala:520: sane_control_option (2, 
SANE_ACTION_SET_VALUE, "Color") -> (SANE_STATUS_GOOD, "Color")
[+57.16s] DEBUG: scanner.vala:425: sane_control_option (11, 
SANE_ACTION_SET_VALUE, SANE_TRUE) -> (SANE_STATUS_GOOD, SANE_TRUE)
[+57.16s] DEBUG: scanner.vala:425: sane_control_option (9, 
SANE_ACTION_SET_VALUE, SANE_TRUE) -> (SANE_STATUS_GOOD, SANE_TRUE)
[+57.16s] DEBUG: scanner.vala:520: sane_control_option (7, 
SANE_ACTION_SET_VALUE, "None") -> (SANE_STATUS_GOOD, "None")
[+57.16s] DEBUG: scanner.vala:462: sane_control_option (3, 
SANE_ACTION_SET_VALUE, 300) -> (SANE_STATUS_GOOD, 300)
[+57.16s] DEBUG: scanner.vala:502: sane_control_option (16, 
SANE_ACTION_SET_VALUE, 215.899994) -> (SANE_STATUS_GOOD, 215.899994)
[+57.16s] DEBUG: scanner.vala:502: sane_control_option (17, 
SANE_ACTION_SET_VALUE, 381.000000) -> (SANE_STATUS_GOOD, 381.000000)
[+103.29s] DEBUG: scanner.vala:1197: sane_start (page=0, pass=0) -> 
SANE_STATUS_IO_ERROR
[+103.29s] WARNING: scanner.vala:1204: Unable to start device: Error during 
device I/O
[+103.29s] DEBUG: scanner.vala:738: sane_cancel ()
[+106.14s] DEBUG: scanner.vala:741: sane_close ()
[+106.49s] DEBUG: autosave-manager.vala:332: Adding an autosave for a new page
[+107.60s] WARNING: autosave-manager.vala:356: Error 5 while executing query
[+108.02s] WARNING: autosave-manager.vala:278: Error 5 while executing query
[+108.38s] DEBUG: autosave-manager.vala:383: Updating the autosave for a page
[+108.38s] WARNING: 
(/home/bob/bzr/simple-scan/trunk/src/autosave-manager.vala:440):autosave_manager_real_update_page:
 runtime check failed: (_tmp100_ == SQLITE_DONE)

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https://bugs.launchpad.net/bugs/1266310

Title:
  impossible to scan all pages from feeder with HP OfficeJet 6310

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