So after a minor encounter with some coffee my Thinkpad X1 Carbon is permanently throtteling the processor to 0.4Ghz (minimum speed) and i am absolutely stumped as to why at this point.
- I spilled some coffee over the keyboard (still works) and in the side of the machine.
- Most of the inside of the laptop remained clean but some liquid sept under the protective plastic on the pcb.
- After cleaning everything i noticed the laptop still works fine but the processor is permanently stuck at its minimum core speed.
- Intel XTU and ThrottleStop report the processor as both thermal and power limited.
- The Battery does not charge
- Using ThrottleStop to remove "BD Procrot" (thermal throtteling) works for the thermal limit, but since the processor is power limiting too it still runs slow.
- All Lenovo Diagnostics/Tests run with no errors (except the Battery charge test)
- Reset the Laptop by holding the power button ~30secs with no AC attached (dosnt work)
- Reset the Laptop by pressing the reset button on the bottom (didnt work)
- Reset the BIOS (didnt work)
- Reinstalled chipset and intel framework drivers (didnt work)
- Started Ubuntu 20.04 from usb stick (didnt work the laptop throttles the exact same way in Linux)
- Checked settings in XTU (didnt work, everything is at stock speeds/settings)
- Checked windows settings like power plan etc, everything is set to maximum performance
- Tried to disable SpeedStep in BIOS and manually set processor clock. (didnt work, processor ignores setting and still runs slow)
- Tried anoter AC adapter (didnt work)
- Replaced the Battery (didnt work, exact same symptoms)
- Cheked windows system logs. Windows reports the processor beeing limited at system level, nothing else.
- Checked if the AC Adapter is powerful enough to support the tdp of the laptop (65W > 25W max TDP on the package)