I don't use to write so much, normally i try to solve my own problems with lots of reading and patience
Now i come to you to give something back to the community, i have spent my free time this past week researching and trying to complete this.
I think 99,99% of the job is done for the average users regarding this DSDT patching.
I present you all, interested and not interested too ....
Dell Optiplex 755 DSDT patched.
-DTGP Method (Obviously )
-Native SATA ACHI (the mobo fits ICH9, now spoofed to ICH10)
-ISA/LPC Fixed (not completely but enough)
-CPU P-states Fixed
-CPU C-states ¿¿NOT FIXED??
This all patching provides: Vanilla Speedstep with no additional kexts nor Disablers, Sleep (by front button or via system menu) and Wakeup support (via front button, or mouse click or keyboard keypress), no cmos corruption on reset, Devices recognized in System profiler, fast boot and power off...
This all on vanilla installation, using iBoot legacy, Retail 10.6 OSX install DVD, and Multibeast 3.4 selecting easybeast to make it install and the first start. Also added MacPro3,1 from multibeast.
After that, copy my DSDT patched to /Extra folder and rename to DSDT.aml then use Apple 10.6.7 Combo Update to get to the latest
I have not patched Audio device, use VoodoHDA.kext via multibeast to get sound working, and use Intel82566MM.kext (locate at kexts.com) in S/L/E/IONetworkingfamily/Contents/Plugins to get wired ethernet working if it does not work OOB for you.
I have not tried to patch the onboard intel graphics cause i use another PCIe nvidia card which i activate via EFI string, so no traces in DSDT for it that can disturb other users.
Hmmm, i think i don't forget anything, i hope Optiplex 755 lucky owners can now enjoy even more powerfull his "New MAC" Right now my /Extra/Extensions only have EvOreboot and FakeSMC kexts, and all works like a charm. Edit: Yeah! i forgot something important, this DSDT is for Optiplex 755 with bios flashed at rev A15
Here's link to my mediafire shared folder with the files.
http://www.mediafire.../?7c5y95cw8ucir Oops!! I see i can attach to the post too, so i do too.
There you will find two files, the .DSL that is TextEditable, and the ready-to-use .AML that only needs to be renamed properly and dropped in /Extra folder.
Edit 1: Just added full patch for USB, now OHCI and EHCI both are patched and fully working. In mediafire folder is the new dsdt too. I guess even reading "LPC device not properly initialized c-states manager not enabled" they indeed work, cause sleeps completely instant and wakes up in almost a second. So it seems C6 state is achieved. Remember to set Deep low power on bios.
All comments are welcome, come on! don't be shy Test it and come back to tell your impressions