When using the liteon DVD and you want to change the read speed you can use the following link :
Here it is possible to download a firmware, that can be modified,
you then need OmniPatcher, can be downloaded at the same homepage
With omnipatcher you create a new firmware for the dvd drive, where it is possible change drivespeed, readspeed.
After this you write firmware to DVD drive.
Now just install drive in player, you now have a lownoise dvd player from kiss
Hope you get it to work !!!, I DID .-)