Linux - Httqm's Docs

I have an HP Deskjet F2480 "all-in-one" printer/scanner. I know it works on GNU/Linux because I already printed with it with Ubuntu (can't remember which release, though, 't was the 12.xx or 13.xx maybe). The scanner worked fine too.

Now I've switched to Debian (Jessie in the initial version of this article, Stretch for the current edit), I can't remember what I did to make it work (if anything special).

So here are notes for my future self to make things easier (you're welcome, bro' )

In search of solutions, I've tried many different things which finally worked. But I can't tell whether just the final action was the solution, or a combination of actions. So here's everything I did.

Jump to the solution.

sane-find-scanner

on Jessie :

# sane-find-scanner will now attempt to detect your scanner. If the
# result is different from what you expected, first make sure your
# scanner is powered up and properly connected to your computer.

# No SCSI scanners found. If you expected something different, make sure that
# you have loaded a kernel SCSI driver for your SCSI adapter.

found USB scanner (vendor=0x03f0 [HP], product=0x7611 [Deskjet F2400 series]) at libusb:001:044
# Your USB scanner was (probably) detected. It may or may not be supported by
# SANE. Try scanimage -L and read the backend's manpage.

# Not checking for parallel port scanners.

# Most Scanners connected to the parallel port or other proprietary ports
# can't be detected by this program.

on Stretch :


found USB scanner (vendor=0x03f0 [HP], product=0x7611 [Deskjet F2400 series]) at libusb:001:007

scanimage -L

on Jessie :

No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).

on Stretch :

device `hpaio:/usb/Deskjet_F2400_series?serial=CN9AT172RV05BS' is a Hewlett-Packard Deskjet_F2400_series all-in-one

apt install libsane-extras
vim /etc/sane.d/dll.conf (source)
```
(nothing found matching my scanner )
```
lsusb
```
Bus 001 Device 044: ID 03f0:7611 Hewlett-Packard DeskJet F2492 All-in-One
```
ls -al /dev/bus/usb/001/044
```
crw-rw-r-- 1 root lp 189, 43 Jan 11 20:21 /dev/bus/usb/001/044
```
The device ID (here 044) is incremented each time a device is detected (unplug + replug or off + on counts as "new device detected")
sudo adduser saned lp
apt install --no-install-recommends hplip
Do one of these :
- reboot the computer (tested : it works )
- turn off and on again the printer/scanner
- unplug + replug the printer/scanner USB cord
It should work now

Final note : Xsane now detects my scanner but looks WAY too complex for my VERY basics needs. Simple-scan is just fine.

To do so, my 1^st idea was to try using the ATI Catalyst Control Center (running /usr/bin/amdcccle as root), but this didn't work
After some research, the solution is xrandr.

List the detected monitors :

xrandr -q may output something like (this is actually what is output AFTER configuration) :

Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 8192 x 8192
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 337mm x 270mm
	1280x1024	75.02	60.02*
	1024x768	75.08	70.07	60.00
	800x600		75.00	60.32
	640x480		75.00	60.00	59.93
	720x400		70.08	70.08
DVI-1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 338mm x 270mm
	1280x1024	60.02*+	75.02
	1152x864	75.00
	1024x768	75.08	70.07	60.00
	832x624		74.55
	800x600		72.19	75.00	60.32	56.25
	640x480		75.00	72.81	66.67	60.00	59.94
	720x400		70.08

Screen names are listed UPPERCASE, then their settings (details).

Configure both monitors :

xrandr --auto --output DVI-0 --mode 1280x1024
xrandr --auto --output DVI-1 --mode 1024x768 --pos 1280x300

--pos declares the offset of the lower-left corner of DVI-1 relatively to the lower-left corner of DVI-0.
Don't spend too much time trying to align windows on screens of different sizes/resolutions : pixels may not be the same height on both screens
The device that is declared 1^st becomes the primary screen. By default, Gnome displays the panel on this screen only (source).

Even simpler method :

xrandr --output DVI-1 --left-of DVI-0

More in the xrandr man page and on Wikipedia.

If xrandr complains xrandr: screen cannot be larger than widthxheight (source) :

Open /etc/X11/xorg.conf (this was created with aticonfig --initial when installing ATI non-free driver)

In the Screen | Display subsection, declare the size on the Virtual Display : Virtual 2304 1068

Section "Screen"
	Identifier		"aticonfig-Screen[0]-0"
	Device			"aticonfig-Device[0]-0"
	Monitor			"aticonfig-Monitor[0]-0"
	DefaultDepth		24
	SubSection		"Display"
		Viewport	0 0
		Depth		24
		Virtual		2304 1068
	EndSubSection
EndSection

Save settings (source) :

Simply write the command line above into ~/.xprofile.

(Re-)Apply settings after opening a graphical session :

Manually : source ~/.xprofile
Automatically : how to launch a program upon session opening

New Logos :

Logo	USB version	Bandwidth
	USB 2.0 (high speed version, with red stripe)	480 Mbits/s (theoretical) 60-80 Mbits/s (practical)
	USB 1.1	12 Mbits/s (theoretical) 2 Mbits/s (practical)

Details

USB devices use different kinds of controller interface:
- the open host controller interface (OHCI)
- the universal host controller interface (UHCI)
- the enhanced host controller interface (EHCI) which supports USB 2.0
The 1^st kernel version that support USB 2.0 is 2.5, however some 2.4.x kernels have been added the EHCI support.
This is true with the kernel 2.4.19 from the Mandrake 9.0 distribution.
To know which USB version is currently supported by the hardware, just list the currently connected USB devices (even if no external device is present, the root hubs are there ;-) and sort the output on the line containing the version number :
grep '^D' /proc/bus/usb/devices

IEEE 1394 is the "real" name of that technology, also known as FireWire and iLink (Sony).
Actually, the connection method is quite similar to connecting a USB digital camera. Here is the procedure I use :

To connect the HDD :

physically connect the HDD
modprobe ohci1394
modprobe sbp2
mount /dev/sdxx mountPoint

To disconnect this HDD :

Unloading ohci1394 from the 2.4.10-12a kernel results in a DEADLOCK condition that requires a reboot. So never unload ohci1394 and don't use /etc/modules.conf to associate sbp2 with ohci1394 because if you do, then unloading sbp2 will cause ohci1394 to unload
simply unload the sbp2 module :
modprobe -r sbp2
physically disconnect the HDD

To reconnect the HDD :

physically connect the HDD
To gain access to the drive, both ohci1394 and sbp2 must be loaded:
- ohci1394 is still loaded since we can't unload it without messing things up.
- sbp2 must be loaded / unloaded each time the drive is attached / removed. It is currently unloaded, so load it :
  modprobe sbp2

Linux - Peripheral hardware

How to detect and use my HP Deskjet printer / scanner on Debian ?

Situation

Details

Solution

How to setup dual-screen display ?

List the detected monitors :

Configure both monitors :

Even simpler method :

If xrandr complains xrandr: screen cannot be larger than widthxheight (source) :

Save settings (source) :

(Re-)Apply settings after opening a graphical session :

Linux and USB 2.0

New Logos :

Details

How to connect a FireWire (IEEE1394) hard drive?

To connect the HDD :

To disconnect this HDD :

To reconnect the HDD :