usb modem dialin 
Wednesday, September 7, 2011, 16:04 - System, Network, Debian/Ubuntu
Posted by Administrator
Server

needed packages: mgetty, pppd

start and stop mgetty on plugin of usbmodem (0572:1329 Conexant Systems (Rockwell), Inc.)

/etc/init/mgetty.conf
# mgetty - dialin daemon

description     "mgetty daemon"

start on tty-device-added KERNEL=ttyACM0
stop on tty-device-removed KERNEL=ttyACM0

respawn
exec /sbin/mgetty -s 115200 -D /dev/ttyACM0

/etc/mgetty/login.config
/AutoPPP/ - a_ppp /usr/sbin/pppd auth +chap -pap name dialinserver remotename dialer debug

I use chap instead of pap because of plain password used by pap.

/etc/ppp/chap-secrets
dialer dialinserver password *

/etc/ppp/options.ttyACM0
10.0.0.1:10.0.0.2


Client

needed packages: pppd

/etc/ppp/peers/dialinserver
noauth
connect "/usr/sbin/chat -v -f /etc/chatscripts/dialinserver"
debug
/dev/ttyS0
115200
defaultroute
noipdefault
name dialer
remotename dialinserver

/etc/chatscripts/dialinserver
ABORT BUSY ABORT 'NO CARRIER' ABORT VOICE ABORT 'NO DIALTONE' ABORT 'NO DIAL TONE'
ABORT 'NO ANSWER' ABORT DELAYED
'' ATZ
OK-AT-OK "ATDTnumber"
CONNECT \d\c

/etc/ppp/chap-secrets
dialer dialinserver password *

Connect with "pon dialinserver" and disconnect with "poff dialinserver"

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fast reboot with kexec 
Friday, March 4, 2011, 15:15 - System, Debian/Ubuntu
Posted by Administrator
sudo apt-get install kexec-tools

change LOAD_KEXEC to true in /etc/default/kexec

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record a video with ffmpeg from a webcam with audio 
Monday, January 31, 2011, 18:49 - System
Posted by Administrator
First activate and rise webcam audio input level with alsamixer.

ffmpeg -f video4linux2 -i /dev/video0 -pix_fmt yuv420p -s vga -r 8 -f alsa -ac 1 -ar 16000 -i hw:1,0 -vcodec mpeg4 -b 400k -acodec libmp3lame -ab 80k video.avi

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key remap on keyboard for console and X 
Thursday, January 13, 2011, 16:45 - System, Debian/Ubuntu
Posted by Administrator
I got a funny viennese dialect keyboard, but after start using it i missed a key '<,>,|' :-(

So i searched for a way to remap 'AltGr + y' to '|', 'AltGr + ,' to '<' and 'AltGr + .' to '>'

Console


evaluate the key to change with

#> sudo showkey -s

press the key

here y is 0x2c = 44
here , is 0x33 = 51
here . is 0x34 = 52

test remap with

echo "altgr keycode 44 = bar" | loadkeys

bar is a symbolic name i found at German-Howto

Finally i extended /etc/rc.local with
LOADKEYS=$(which loadkeys)
if [ -x $LOADKEYS ]; then
  cat << EOT | $LOADKEYS
altgr keycode 44 = bar
altgr keycode 51 = less
altgr keycode 52 = greater
EOT
  unset LOADKEYS
fi

Xorg



evaluate the key to change with

#> xev

press the key

here y is keycode 52
here , is keycode 59
here . is keycode 60

test remap with

xmodmap -e "keycode 52 = y Y y Y bar"

dump keys with

#> xmodmap -pke > ~/.Xmodmap

remove all lines except lines starting with desired keycodes to change.

my ~/.Xmodmap now looks like
keycode  52 = y Y y Y bar U203A guillemotright
keycode  59 = comma semicolon comma semicolon less multiply periodcentered
keycode  60 = period colon period colon greater division U2026


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Audio only capture from a video/audio usb capture stick 
Tuesday, April 27, 2010, 18:46 - System
Posted by Administrator
#> apt-get install xawtv

I assume the usb stick become /dev/video0 and audio became card 1 (card 0 is an onboard audio device)

#> v4lctl -c /dev/video0 setattr input Composite1
#> v4lctl -c /dev/video0 setattr mute off
#> amixer -c 1 sset Line,0 50%,50% unmute cap

test with:

#> arecord -D hw:1,0 -f S16_LE -c2 -r48000 | aplay

To execute this commands automatically on plugin udev could be used:

I have a cheap msi movie vox mini stick using em28xx driver with an option set:

/etc/modprobe.d/local.conf
options em28xx card=38

/etc/udev/rules.d/90-usbvideo.rules:
ACTION=="add", KERNEL=="video*", DRIVERS=="usb", ATTRS{idVendor}=="eb1a", ATTRS{idProduct}=="2861", RUN+="/usr/bin/v4lctl -c /dev/%k setattr input Composite1"                      
ACTION=="add", KERNEL=="video*", DRIVERS=="usb", ATTRS{idVendor}=="eb1a", ATTRS{idProduct}=="2861", RUN+="/usr/bin/v4lctl -c /dev/%k setattr mute off"                              
ACTION=="add", KERNEL=="video*", DRIVERS=="usb", ATTRS{idVendor}=="eb1a", ATTRS{idProduct}=="2861", RUN+="/usr/bin/logger video init %k done"                                       
ACTION=="add", KERNEL=="controlC[0-9]*", DRIVERS=="usb", ATTRS{idVendor}=="eb1a", ATTRS{idProduct}=="2861", RUN+="/usr/bin/amixer -c %n sset Line,0 50%,50% unmute cap"             
ACTION=="add", KERNEL=="controlC[0-9]*", DRIVERS=="usb", ATTRS{idVendor}=="eb1a", TTRS{idProduct}=="2861", RUN+="/usr/bin/logger audio init card %n done"

v4lctl needs some time to finish, to check the settings use:

v4lctl -c /dev/video0 show

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