Sound on my HP tx2510us (tx2500) using OpenSuSE 11.1 64 bit linux

you must have
-kernel-source
-gcc
-make
-xmlto (many tutorial forget it, causing error on make step)

you must dowload
-linuxPkgxxx from realtek.com, that is alsa customized by realtek or simply realtek HD driver for linux

you must
1. unzip it
2. cd to where path you unzip it
3. cd alsa-lib
4. ./configure
5. sudo make install
6. cd ..
7. cd alsa-tool
8. ./configure
9. make
10. sudo make install
11. cd ..
12. cd alsa-driver
13. ./configure
14. make
15. sudo make install
16. sudo alsaconf (press Enter whenever you are prompted to choose something :))
17. exit
18. restart (maybe you have heard the sound of KDE end session)
19. pray
20. ... (maybe, you want to run amarok, :))

hope it usefull