Issues with KDE live cd booting

[Andreyshel]

Hello.
At first technical characteristics of my computer:
Model HP 635(LH405EA).
Processor AMD Athlon II P360, 2300 MHz
Videocard 1 AMD M880G with ATI Mobility Radeon HD 4250
Videocard 2 AMD Radeon HD 6370M
Monitor resolution 1766x768
Wireless Adapter Atheros AR9285

Sabayon shows a clean console after starting. I didn't found something special in verbose mode messages. I have tried to start it in VESA mode and with parameter legacy also.
Thanks for your help.
Andrey.
P.S English is not my native language. I posted this message in English for practice. If you have problems with reading this message, tell me and I will revert to a Russian localized section.

[Fitzcarraldo]

Not sure, but it could be that your two AMD GPUs are confusing the loader.

Other things to try at boot of the LiveDVD (press F5 and append each of the following in turn):

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xdriver=ati

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xdriver=radeon

[Andreyshel]

Other things to try at boot of the LiveDVD (press F5 and append each of the following in turn):

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xdriver=ati

I appended that and started xserver and kde session manually(Because it does not start automatically). But, system works really slow. I tried to start installer,but it froze.

[Fitzcarraldo]

Are there any error messages in /var/log/Xorg.0.log or /var/log/kdm.log files?

Also, make sure the OpenGL libraries set correctly:

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# eselect opengl set ati

Another thing you could do is to check to what the mesa libraries are set, and switch them to 'classic' if necessary:

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# eselect mesa list

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# eselect mesa set 64bit r600 classic
# eselect mesa set 64bit r300 classic
# eselect mesa set 64bit sw classic
# eselect mesa set 32bit r600 classic
# eselect mesa set 32bit r300 classic
# eselect mesa set 32bit sw classic

or whatever it is that is returned by the list command.