Dell XPS 12 9250 - power management

[jhax01]

Having a hard time getting power management to work. Pike's script recognizes the CPU and generates the SSDT, but if I use it I get the attached kernel panic. Booting without the SSDT allows the CPU to turbo etc, but at idle it sits at the base frequency of 1Ghz and never drops down to 500Mhz. GPU seems to work just fine tho. Intel Power Gadget shows it cycling from what appears to be a dead stop to 900Mhz.

I'm attaching my Clover folder, ioreg, the SSDT that I tried and a photo of the kernel panic.

One other thing of note is that the TDP for the chip is supposed to be 4.5W (m5-6y54) but it will use upwards of 10W on OSX and never goes above 6W on Win 10.


Terminal output:
Last login: Tue May 3 22:55:30 on ttys000

jlitkos-MBP:~ jlitko$ kextstat|grep -y acpiplat

13 2 0xffffff7f82d11000 0x60000 0x60000 com.apple.driver.AppleACPIPlatform (4.0) A29C7512-D3A8-3AED-9721-3A5FF1A32EB2 <12 11 7 6 5 4 3 1>

jlitkos-MBP:~ jlitko$ kextstat|grep -y appleintelcpu

jlitkos-MBP:~ jlitko$ kextstat|grep -y applelpc

80 0 0xffffff7f8269c000 0x3000 0x3000 com.apple.driver.AppleLPC (3.1) 32BDCF9F-0473-32D4-9DAE-F523EFB2D244 <75 12 5 4 3>

jlitkos-MBP:~ jlitko$ kextstat|grep -y applehda

91 1 0xffffff7f82a0e000 0x1e000 0x1e000 com.apple.driver.AppleHDAController (274.7) CFF7F97F-6E1F-3CF9-A8E3-76125E9CA414 <90 89 82 12 7 6 5 4 3 1>

117 0 0xffffff7f82b7a000 0xb3000 0xb3000 com.apple.driver.AppleHDA (274.7) FE47EADA-C810-3253-BE41-0776D253D256 <116 96 91 90 89 82 12 11 6 5 4 3 1>

jlitkos-MBP:~ jlitko$

 

[RehabMan]

Did you try different SMBIOS?

 

[jhax01]

I'll give that a shot. I just figured that the MacBook9,1 would be the best choice since it has the exact same processor. Don't get me wrong, it runs well as is, and the battery life is acceptable, but I can't get it to wake from sleep and that seems to be a PM issue more than not.