plustek: Thread: Scrambled image with Plustek 4813P using more than 100 dpi

Hello,

I have problems using a scanner "Plustek OpticPro 4831P". If I use
resolutions above 100 dpi (f.e. 200 dpi) horizontal regions of the image are
scrambled. If I try to scan the maximum possible size (A4, 200 dpi) the scanner
produces an awful noise. With resolutions <= 100 dpi the driver works correctly.

My configuration:
Plustek driver: Version 0.44 - Build 10 (17.10.2002) for SANE 1.0.8 and
higher
SuSE 8.1 with SANE 1.0.8.
HP Laserjet 6L and scanner connected to parallel port.

Yours sincerely

Johannes Hennecke

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Hi,

try and remove the HP Laserjet and also make sure not to load
ppdev module...

Gerhard

On Samstag, 28. Dezember 2002 16:43, ####@####.#### wrote:
> Hello,
>
> I have problems using a scanner "Plustek OpticPro 4831P". If I use
> resolutions above 100 dpi (f.e. 200 dpi) horizontal regions of the image
> are scrambled. If I try to scan the maximum possible size (A4, 200 dpi) the
> scanner produces an awful noise. With resolutions <= 100 dpi the driver
> works correctly.
>
> My configuration:
> Plustek driver: Version 0.44 - Build 10 (17.10.2002) for SANE 1.0.8 and
> higher
> SuSE 8.1 with SANE 1.0.8.
> HP Laserjet 6L and scanner connected to parallel port.
>
> Yours sincerely
>
> Johannes Hennecke

Hello Gerhard,

<< try and remove the HP Laserjet and also make sure not to load
<< ppdev module...

I remove the printer cable (all devices were switched off before) and started 
the computer. The module ppdev was not loaded (see list made with "lsmod" 
below),  but images scanned with higher resolution are still scrambled :(.

Scanning with higher resolution causes much more date to be transferred over 
parallel interface. Maybe the data are transferred too fast, so that the data 
recognition/sending on parallel port does not work correctly and reads/writes 
corrupted data.

Is there a way to modify the plustek driver in that way that the data transfer 
is slowed down?

Best regards

Johannes Hennecke

linux:/home/johannes # lsmod
Module                  Size  Used by    Not tainted
snd-pcm-oss            44928   0  (autoclean)
snd-mixer-oss          12728   1  (autoclean) [snd-pcm-oss]
videodev                5600   0  (autoclean)
usbserial              18492   0  (autoclean) (unused)
parport_pc             25544   1  (autoclean)
lp                      6656   0  (autoclean)
parport                22528   1  (autoclean) [parport_pc lp]
snd-seq-oss            27296   0  (autoclean) (unused)
snd-seq-midi            4480   0  (unused)
snd-seq-midi-event      2920   0  [snd-seq-oss snd-seq-midi]
snd-opl3-synth         10436   0  (unused)
snd-seq-instr           4816   0  [snd-opl3-synth]
ipv6                  138964  -1  (autoclean)
snd-seq-midi-emul       4784   0  [snd-opl3-synth]
snd-seq                37776   2  [snd-seq-oss snd-seq-midi snd-seq-midi-event 
snd-opl3-synth snd-seq-instr snd-seq-midi-emul]
snd-ainstr-fm           1796   0  [snd-opl3-synth]
snd-ad1816a             3024   1
snd-opl3-lib            6532   0  [snd-opl3-synth snd-ad1816a]
snd-hwdep               4576   0  [snd-opl3-lib]
snd-ad1816a-lib        11824   0  [snd-ad1816a]
snd-pcm                63328   0  [snd-pcm-oss snd-ad1816a-lib]
snd-timer              11524   0  [snd-seq snd-opl3-lib snd-ad1816a-lib 
snd-pcm]
snd-mpu401-uart         3296   0  [snd-ad1816a]
snd-rawmidi            13920   0  [snd-seq-midi snd-mpu401-uart]
snd-seq-device          4140   0  [snd-seq-oss snd-seq-midi snd-opl3-synth 
snd-seq snd-opl3-lib snd-rawmidi]
snd                    31300   0  [snd-pcm-oss snd-mixer-oss snd-seq-oss 
snd-seq-midi snd-seq-midi-event snd-opl3-synth snd-seq-instr 
snd-seq-midi-emul snd-seq snd-ad1816a snd-opl3-lib snd-hwdep snd-ad1816a-lib 
snd-pcm snd-timer snd-mpu401-uart snd-rawmidi snd-seq-device]
soundcore               3396   0  [snd]
st                     26924   0  (autoclean) (unused)
sr_mod                 13432   0  (autoclean)
cdrom                  26400   0  (autoclean) [sr_mod]
sg                     27904   0  (autoclean)
joydev                  5600   0  (unused)
evdev                   4352   0  (unused)
input                   3168   0  [joydev evdev]
usb-uhci               21612   0  (unused)
usbcore                56768   1  [usbserial snd usb-uhci]
hisax                 470500   4
isdn                  123584   6  [hisax]
slhc                    5040   1  [isdn]
isa-pnp                29664   0  [snd-ad1816a hisax]
nls_iso8859-15          3324   3  (autoclean)
nls_cp437               4316   3  (autoclean)
vfat                    9620   3  (autoclean)
fat                    30584   0  (autoclean) [vfat]
lvm-mod                62976   0  (autoclean)
ide-scsi                7920   0
reiserfs              179536   1

Hi Johannes,

you might try the switch slowIO...

Gerhard

On Saturday, 11. January 2003 12:29, Johannes Hennecke wrote:
> Hello Gerhard,
>
> << try and remove the HP Laserjet and also make sure not to load
> << ppdev module...
>
> I remove the printer cable (all devices were switched off before) and
> started the computer. The module ppdev was not loaded (see list made with
> "lsmod" below),  but images scanned with higher resolution are still
> scrambled :(.
>
> Scanning with higher resolution causes much more date to be transferred
> over parallel interface. Maybe the data are transferred too fast, so that
> the data recognition/sending on parallel port does not work correctly and
> reads/writes corrupted data.
>
> Is there a way to modify the plustek driver in that way that the data
> transfer is slowed down?
>
> Best regards
>
> Johannes Hennecke
>
> linux:/home/johannes # lsmod
> Module                  Size  Used by    Not tainted
> snd-pcm-oss            44928   0  (autoclean)
> snd-mixer-oss          12728   1  (autoclean) [snd-pcm-oss]
> videodev                5600   0  (autoclean)
> usbserial              18492   0  (autoclean) (unused)
> parport_pc             25544   1  (autoclean)
> lp                      6656   0  (autoclean)
> parport                22528   1  (autoclean) [parport_pc lp]
> snd-seq-oss            27296   0  (autoclean) (unused)
> snd-seq-midi            4480   0  (unused)
> snd-seq-midi-event      2920   0  [snd-seq-oss snd-seq-midi]
> snd-opl3-synth         10436   0  (unused)
> snd-seq-instr           4816   0  [snd-opl3-synth]
> ipv6                  138964  -1  (autoclean)
> snd-seq-midi-emul       4784   0  [snd-opl3-synth]
> snd-seq                37776   2  [snd-seq-oss snd-seq-midi
> snd-seq-midi-event snd-opl3-synth snd-seq-instr snd-seq-midi-emul]
> snd-ainstr-fm           1796   0  [snd-opl3-synth]
> snd-ad1816a             3024   1
> snd-opl3-lib            6532   0  [snd-opl3-synth snd-ad1816a]
> snd-hwdep               4576   0  [snd-opl3-lib]
> snd-ad1816a-lib        11824   0  [snd-ad1816a]
> snd-pcm                63328   0  [snd-pcm-oss snd-ad1816a-lib]
> snd-timer              11524   0  [snd-seq snd-opl3-lib snd-ad1816a-lib
> snd-pcm]
> snd-mpu401-uart         3296   0  [snd-ad1816a]
> snd-rawmidi            13920   0  [snd-seq-midi snd-mpu401-uart]
> snd-seq-device          4140   0  [snd-seq-oss snd-seq-midi snd-opl3-synth
> snd-seq snd-opl3-lib snd-rawmidi]
> snd                    31300   0  [snd-pcm-oss snd-mixer-oss snd-seq-oss
> snd-seq-midi snd-seq-midi-event snd-opl3-synth snd-seq-instr
> snd-seq-midi-emul snd-seq snd-ad1816a snd-opl3-lib snd-hwdep
> snd-ad1816a-lib snd-pcm snd-timer snd-mpu401-uart snd-rawmidi
> snd-seq-device]
> soundcore               3396   0  [snd]
> st                     26924   0  (autoclean) (unused)
> sr_mod                 13432   0  (autoclean)
> cdrom                  26400   0  (autoclean) [sr_mod]
> sg                     27904   0  (autoclean)
> joydev                  5600   0  (unused)
> evdev                   4352   0  (unused)
> input                   3168   0  [joydev evdev]
> usb-uhci               21612   0  (unused)
> usbcore                56768   1  [usbserial snd usb-uhci]
> hisax                 470500   4
> isdn                  123584   6  [hisax]
> slhc                    5040   1  [isdn]
> isa-pnp                29664   0  [snd-ad1816a hisax]
> nls_iso8859-15          3324   3  (autoclean)
> nls_cp437               4316   3  (autoclean)
> vfat                    9620   3  (autoclean)
> fat                    30584   0  (autoclean) [vfat]
> lvm-mod                62976   0  (autoclean)
> ide-scsi                7920   0
> reiserfs              179536   1
>
>
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Hello Gehard,

> you might try the switch slowIO...

slowIO was already switched on (part of modules.conf):
---------------------------------
alias char-major-40	pt_drv
pre-install pt_drv modprobe -k parport
options pt_drv lampoff=180 warmup=15 port=0x378 lOffonEnd=1 mov=0 
slowIO=1forceMode=2
---------------------------------

Best Regards,

Johannes Hennecke