Dropkickwalker

Maldon, I would just like to say THANK YOU for your help earlier this week. In addition, all those who contributed to this thread. I believe that my Dell Optiplex has full native PM now. I made two changes: 1. changes the CPU from E6550 C2Duo to a Q6600 C2Quad; 2. Updated DSDT to specify 4 CPU's with the P States; LPC is loaded and Kernel.log does NOT report missing C-States! Apart from signifiant (almost double and close to my new MacbookPro i5) GeekBench scores (32bit - I am cheap), sleep is working. However, it is VERY slow to resume. It takes 60-90 seconds for the screen to wake and for the keyboard to become responsive. I guess that I just need to be patient for waking from sleep Thanks again, Rob

Oh Wait. Sorry, i understand now, the suggestion is that some Dell's don't generate c-states. However, I have just managed to update my DSDT with my LPC's Device ID, which I also added to AppleLPC.kext. There is no longer any system log messages complaining about c-states. I therefore think that they have loaded. Some more testing... regards, Rob

thanks Maldon. Please can you explain the comment about CST? SHould I replace _CST with something else? Many thanks Rob

Hi everyone, I am hoping someone can please help. I have a patched DSDT that provides built-in USB/2, nVidia Graphics, SBUS, built-in SATA and the usual DSDT fixes. Only thing left to patch is HDEF and HDMI audio, but I am not too interested in those since I use a natively supported USB audio solution. The system is stable, but I am missing C-States and wake from sleep returns to a black screen and needs rebooting. When rebooted, from a failed wake from sleep, the BIOS changes the Ethernet setting to 'OFF' or "PXE'. is there anyone who can offer some help? Perhaps I need to patch my Ethernet in the DSDT? I just can't find where to do this in the DSDT. Dell Optiplex 755 Desktop BIOS A19(latest). DSDT attached. I have no additional Kexts in /Extra. Thanks in advance! Rob Dropkicks Optiplex 755 dsdt.aml.zip