efficiency – Macbook Professional 2011 – CPU Thermal Throttling

Macbook Professional (13”, late 2011);
Reminiscence 4GB;
Processor 2,4Ghz Intel;
Graphics Intel HD;
Mac OS Sierra 10.12.6;
Energy adapter unique 60W (bought 2 of them);
Battery new.

This concern has been reported earlier than (Macbook Professional 2011 sluggish) and gave the impression to be solved because the Mac was working superb for 3 days. Earlier than the issue solely occurred when the battery was almost 100% charged with the ability adapter linked.

Here’s what occurs now:

• When the battery is charged greater than ~50% whereas having the ability adapter linked, the mac will get very sluggish. The exercise monitor is displaying kernel CPU utilization of as much as 500%, the system is working at ~93%, person load is regular =/< 8%. All different processes are regular. The exercise monitor will not be displaying any processes with extreme vitality consumption. Reminiscence consumption is regular too. The CPU goes again to regular instantly when on Battery solely, with the Energy Adapter disconnected. Inside minutes after connecting the ability adapter the sport begins yet again.
• No distinction with totally different energy adapters.

I carried out a few totally different checks, all completed with out third occasion {hardware}, nothing linked, even not LAN. Software program which had kernel extensions in Library/LaunchDaemons earlier than, was fully eliminated.

Checking the System load whereas on Battery: pmset -g sysload

• 2025-01-02 15:34:49 -0300
• mixed degree = OK
• person degree = OK
• battery degree = OK
• thermal degree = Nice

Checking once more whereas on Energy Adapter with the CPU throttling: pmset -g sysload

• 2025-01-02 15:36:19 -0300
• mixed degree = Dangerous
• person degree = OK
• battery degree = Nice
• thermal degree = Dangerous

Checking the thermal log whereas on Battery, no issues:
pmset -g thermlog

• Notice: No thermal warning degree has been recorded
• Notice: No efficiency warning degree has been recorded
• 2025-01-02 15:56:26 -0300 CPU Energy notify
• CPU_Scheduler_Limit = 100
• CPU_Available_CPUs = 4
• CPU_Speed_Limit = 100

Checking once more whereas on Energy Adapter with the CPU throttling:
pmset -g thermlog

• Notice: No thermal warning degree has been recorded
• Notice: No efficiency
  warning degree has been recorded
• 2025-01-02 15:58:25 -0300 CPU Energy
  notify
• CPU_Scheduler_Limit = 40
• CPU_Available_CPUs = 4
• CPU_Speed_Limit = 29

After these checks I put in TG Professional. The temperatures are completely regular on a regular basis. The fan velocity is adjusting effectively to CPU hundreds. The fan and outlet are additionally clear. I used to be adjusting the fan velocity to max when the issue occurred, however this made no distinction.

It seems to me that there’s a (false) temperature sign from someplace inflicting the CPU throttling though all of the temperatures recorded in addition to the sensors are regular conform to TG Professional. Additionally it is not potential to sense any extreme warmth when touching the Mac.

The one strategy to get the CPU again to regular is disconnecting the Energy Adapter and the system load drops instantly. Additionally the SMC reset is fixing the issue for the second till the battery is charging once more with the Energy Adapter linked.

One other unusual factor I observed is the System Report displaying a destructive mA studying whereas on battery energy solely.

In Secure Mode the Mac remains to be working superb once more underneath any energy provide situation. Anyhow after shutting down from Secure Mode and rebooting the issue comes again.

From my potential that is both a {hardware} drawback (sensor / connection) or a system administration software program drawback. I would really like to have the ability to decide both one.

Due to this fact a few questions:

1. Why are there no thermal and efficiency warnings recorded
   though the efficiency is down and the thermal degree is unhealthy when
   the issue happens?
2. How can the destructive mA studying of the battery
   being defined?
3. Did anyone expertise this drawback, CPU
   throttling solely whereas battery being absolutely charged and utilizing energy
   adapter?
4. Is there some other Terminal instructions or third occasion apps
   to retrieve extra energy administration and SMC data, particularly on different
   temp sensors?
5. Is it price doing a clear boot stick reinstall of
   Sierra?
6. Every other options to determine the foundation explanation for the
   drawback?

Thanks upfront.