Backup to babosa

In the relatively safe environment of my own LAN a nice command to keep some directories in sync with babosa as a backup is:

rsync -av --delete ~/Documents babosa:/home/kompoza/membrillo

Substitute Documents for any folder you want to sync.

This uses the unsafe but fast rsh protocol and I get around 1 MB/s transfer rate.

CXXFLAGS for LinuxSampler

Fooled around a bit with linuxsampler/benchmark and got the following procedure to build an optimized rpm for my machine from LS CVS:

cvs -z3 -d:pserver:anonymous@cvs.linuxsampler.org:/var/cvs/linuxsampler co linuxsampler

or

cvs update -d -P

Then

make -f Makefile.cvs
./configure --prefix=/usr
make dist
cp linuxsampler-0.5.1.8cvs.tar.bz2 ~/rpmbuild/SOURCES/
CXXFLAGS="-O2 -march=pentium-m -ffast-math -mmmx -msse -funroll-loops -fomit-frame-pointer" rpmbuild -ba --clean --target i686 linuxsampler.spec

Problems with C54RU in Windows XP.

Taken from Conceptronic's FAQ about C54RU:

The problem of disconnection due to limited or no connectivity occurs when the unit does not have a correct IP address assigned.

Be sure that the option “Use Windows to manage my wireless network configuration” is disabled.
This can be found in the 'Wireless tab' of the wireless network card properties of the wireless card.

If this box is not disabled, Windows will manage the wireless connection.
You are not able to use the wireless utility of the Conceptronic product.

Additional:
Be sure that the option “Enable IP setting and Proxy setting in profile” in the 'Option tab' of the wireless utility is enabled.
Be sure that there is a working DHCP server or other device is acting as an DCHP server available in your network.

Booting a linux kernel in vesa framebuffer mode

Useful when you want to run graphic apps using FB instead of X (like qemu.)

Add vga=0xnnn to the kernel boot options. The valid modes are listed in linux/Documentation/fb/vesafb.txt.

    | 640x480  800x600  1024x768 1280x1024
----+-------------------------------------
256 |  0x301    0x303    0x305    0x307  
32k |  0x310    0x313    0x316    0x319  
64k |  0x311    0x314    0x317    0x31A  
16M |  0x312    0x315    0x318    0x31B  

Linux filesystem cloning

Using rsync. The resulting filesystem booted but didn't allow logging in, probably some permissions or ownership info got lost in translation:

http://www.seismo.ethz.ch/linux/rsync.html



Using nc and tar, didn't work out too well (it was interrupted by 'unexpected EOF' messages):

http://wiki.clug.org.za/wiki/How_do_I_clone_my_disks_with_Linux%3F




Using dump and ssh. This one does the trick:

http://tldp.org/linuxfocus/English/Archives/lf-2005_03-0370.pdf

Summarizing:

mount /dev/xxx /mnt
cd /mnt
ssh sourcePC 'dump −0 −f − /' | restore −r −f −

jEdit and LC_TYPE

I am using jEdit to edit lilypond files. If I try to enter non-English characters I get strange results unless I start jedit the following way:

LC_CTYPE=en_US.UTF-8 jedit

Brightness support in hardware for mplayer

In my system mplayer uses by default a xv port that doesn't support hw control for things like brightness. As a result, the 3 & 4 keys don't work.

It is resolved by using the option -vo xv:port=89