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Hi, all Here I just want to load my SSDT to implement the CPU speedstep. If I use the SSDT shared by some guys, it can work well. But now I just want to try my SSDT by doing follows: Use the AIDA64 tool to extract SSDT file (6 files in total) Load the six SSDT files by using DSDT editor and fix the compilation error Put those stuff into /Extra folder Starting the OS by using chamleon At last, it give the error as below: panic(CPU 3 caller 0xffffff7f819d1545): P-State Stepper Error 18 at step 35 in context... My CPU is Intel Sandy Bridge [email protected] HZ. Original SSDT: SSDT_original.zip Updated SSDT: SSDT.zip (In fact, I only found SSDT-3.aml and SSDT-5.aml have compilation error. And SSDT-3.aml is about the video card) Can someone help this? Many thanks! Solved: Many thanks to EMlyDinEsH's help. After applied to the artifacts (DSDT & SSDT patch) provided by EMlyDinEsH, my CPU speedstep now work well. The following actions also can work well: 1. shutdown & sleep & wake (not testing deep sleep) 2. brightness adjust 3. battery information with the orginal AppleACPIPlatform (depend on AppleACPIBatteryManager) Great work. Once i need to change some non 8-bit register variables to 8-bit for using AppleACPIBatteryManager. But now EMlyDinEsH seems didn't do such repetitive work, the battery info have been showed up in the menu bar on my lion 10.8.4. 4. wifi 5. disable GT540 (here, EMlyDinEsh may miss something. I have updated this.) Thanks EMlyDinEsh again. You are my hero.