A few days ago I started experiencing a weird issue - one core was stuck at 100% doing some kernel stuff. This problem is NOT OS specific: it occurs in Windows 7 (including Safe Mode), Ubuntu 12.04 installed on the hard drive and Ubuntu 12.04 on live USB.
What I've tried so far:
- Different OSes
- Disabling hyperthreading (with hyperthreading enabled, only one thread gets locked, not the whole core)
- Resetting BIOS
- Updated BIOS from P03ABJ to P05ABJ
- Re-installed Windows 7
- Samsung Series 7 Chronos (NP700Z5C-S02UB)
- Core i7-3635QM CPU
- Windows 7 Professional SP1 or Ubuntu 12.04
EDIT: So this is a bit bizarre. I "reset" the laptop and re-installed Win7. After a short while the problem disappeared both in Windows AND Linux. Now, after installing Intel chipset drivers the problem is back again.
I'm at a loss as to what could be causing this. Any ideas?