I've got my Gateway p-7805u running on 10.5.6.
I have video and audio support.
I got network suport by buying an airport extreme card off of ebay. I am dual booting to 64-bit vista, and it recognized the card. I get N out of OSX and Vista.
Here are the exact steps I followed....
Bought a retail copy of OSX (not used for install, but I try to be an honest hacker...)
Bought aiprort extreme card off of ebay.
Bough a 320GB WD Black Scorpion drive
Added a WD Black Scorpion disk HD to second drive bay.
Disabled legacy USB in BIOS.
Left the wireless switch to ON.
Used the xxx 10.5.6 final v.2 installer
Selected no options (no -v or -x) when booting from the cd
Used Disk Utility in installed to format second drive as GUID Journaled (NOT case-sensitive)
Checked the following items to "customize" install:
Under Optional System kexts:
HardcodedSMBIOS / AppleSMBIOS DDR2 1333
Under Graphics Drivers
Contextant HDA (did not work, had to change audio later)
SKGE_02d (did not detect onboard lan later)
1st battery manager option (there are 2)
Came up 1920x1200 but not quartz enabled
installed os86tools and enabled quartz
rebooted - hurray, full opengl acceleration!
installed camtwist (see this thread) - hurray, webcam works!
rebooted - no audioinstalled AzaliaAudio.pkg (by double clicking)
installed AppleAzaliaAudio.kext (using os86x tools)
(see this thread for both)
rebooted - still no audio
installed drivers from Conextant_Cx20561.zip (on this thread) using Kext Helper b7
rebooted - Hurray! Audio!
installed airport extreme
rebooted in Vista 64-bit, had N network
rebooted in OSX, had N network!
Note: I kept extraneous/non-working kext installs in this list in order to EXACTLY reproduce what I did that resulted in a working OSX install.
Now I will try to tackle the media readers...no idea if they work at this point...and maybe try a live update to 10.5.7...once I time machine this working install...