Reinstall the ATI Driver in Ubuntu

1. Remove old fglrx drivers
1. sudo apt-get remove xorg-driver-fglrx fglrx-kernel-source fglrx
2. sudo /usr/share/ati/amd-uninstall.sh
2. Restart your computer, so that these old drivers are not in use. 
3. Download the correct ATI driver from amd.com. 
4. Install the downloaded driver, e..g, sudu sh amd-driver-installer-12-4-x86.x86_64.run
5. Modify the screen resolution in /etc/X11/xorg.conf if necessary: 

Section "Screen"

Identifier "aticonfig-Screen[0]-0"

Device "aticonfig-Device[0]-0"

Monitor "aticonfig-Monitor[0]-0"

DefaultDepth 24

SubSection "Display"

Modes "1280x1024" "1024x768" "800x600"

Viewport 0 0

Depth 24

EndSubSection

EndSection

Fix the Garbled Chinese Characters in Amarok

find . -iname '*.mp3' -execdir mid3iconv -e GBK {} \;

Merge Multiple PDFs

1. install pdftk: sudo apt-get install pdftk
2. pdftk <a.pdf> <b.pdf> <c.pdf> cat output <all.pdf>