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And I traced_off with acpidebug kext when I were trying to fix this problem last time (about 50 days ago). And it is confirmed that _off code was fully excuted.

I didn't find _ps3 in ssdt-8 and dsdt-9(which are the two SSDTs related to discrete graphics ). And could you tell me if I find _ps3 in dsdt, how could I apply it? BTW, I don't think it's about my patched dsdt and SSDTs because I get the same auto shutdown when I boot into Ubuntu 16.04 install...

And the problem is,I think something is wrong with temperature sensor or cpu power management but I cannot find the exact reason.

If I remove _off then the auto shutdown stops.However the AMD discrete graphics cannot be disabled without _off.And I don't think _ps3 is available.

And according to the BIOS record the system get auto shut because the CPU has reached hot "T" but I used Intel Power Gadget to observe the power consumption and temperature and I found that when the auto shutdown happened the power consumption and temperature are normal. I think that's quite...

And since the system will auto shutdown within short time it's hard to run ioreg and terminal when the AMD discrete graphics is disabled. So I run the ioreg and terminal with the AMD discrete graphics enabled instead. ast login: Sat Sep 17 21:22:24 on console Latitud450deMBP:~ Admin$...

This is the clover folder when auto shutdown happens.

Hi,RehabMan I reported that once I disable my AMD8790M graphics the OS X will auto shutdown within 2 minutes after boot. However we didn't find the solution last time. And now I think I've found the reason of the auto shutdown. I think something is wrong with the CPU power management or...

I've tried these days and I assume that since the fan speed will get high before auto shutdown the reason could be related to power management or CPU. So I checked the console and found that these codes would show up before auto shutdown. Process launched [1] disabling system-wide I/O...

Yes, latest A16 version.

I know this laptop (E6540) have 2 versions. The early version used LVDS screens.However the haswell don't support LVDS so Dell used a eDP to LVDS chip to transfer the eDP signal to LVDS. And the late version used eDP screens. So they don't need the transfer chip anymore. The screen just get...

External monitor used HD4600. And I remember that when I disabled AMD 9790M in OS X, then connect HDMI TV to the laptop,I can get video output at the TV. Since the 8790M was disabled, there's no doubt that HD4600 did the output.

How to check the AMD 8790M is dedicated? I know it has a memory of 2GB GDDR5. And there's no option in BIOS to disable the discrete graphics. Also, I've updated my signature.

How to check the AMD 8790M is dedicated? I know it has a memory of 2GB GDDR5. And there's no option in BIOS to disable the discrete graphics. Also, I've updated my signature.

Then how to debug from now on? And is it possible that the resolution of the screen caused the problem?

Is it possible that the resolution of the screen caused the problem? This laptop should have a 15.6 inch 1920x1080 screen.But now I have not bought the right screen for it so I used a 14.0 inch 1366x768 screen temporarily.

I've done some new tests. test1: Call to SGOF in SSDT-8 _INI and that will cause a very quick auto shutdown. test2: Combine the contents of SSDT-8 into DSDT, call to SGOF in Method (_INI) and Method (_WAK) in DSDT and that will cause fast fan speed and auto shut down,too. The previous test I've...

And what might be the reason of the problem? What should I test next?

It seems that they did excute from beginning to end. Jul 26 08:55:21 MacBook-Pro com.apple.kextcache[489]: kext-dev-mode allowing invalid signature -67062 0xFFFFFFFFFFFEFA0A for kext ACPIDebug.kext Jul 26 09:09:09 localhost kernel[0]: ACPIDebug: Version 0.1.4 starting on OS X Darwin 15.5. Jul...

Method (_INI, 0, NotSerialized) // _INI: Initialize { Store (Zero, \_SB.PCI0.PEG0.PEGP._ADR) _OFF () } Method (SGOF, 0, Serialized) { If (LEqual (CCHK (Zero), Zero)) { Return (Zero) }...