I assume since you are running an AMD that you are using Voodoo kernel. That stated when running 10.5.6 your kernel is still 9.5.0 not 9.6.0 so use the Voodoo installer to reinstall the System.kext and your problems should be fixed.

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HP Pavilion dv6775us - Intel Core 2 Duo T5450 1.67 GHz | 3GB DDR2 | SATA 250 GB 5400 RPM | NVidia 8400M GS | Realtek ALC268 | Realtek RTL8101 | Broadcom 4311 | HP Remote (Front Row + ControllerMate) | 10.5.7 (Voodoo Kernel 9.5.0)

HP Pavilion a1560n - Intel Pentium D 915 2.8 GHz | 2GB DDR2 | SATA 2300 GB 7200 RPM | Intel GMA 950 (DSDT patched)| Realtek ALC882 | Intel 82562v | 10.5.7 (Voodoo Kernel 9.5.0)