Re: CPU overheat with 2.2

[Mikael Pettersson]

Simon Richter writes:
 > I just switched my brother's computer to a 2.2 kernel, and now the CPU
 > overheats under Linux after about half an hour (reproducible). It works
 > fine under Windows 95b and worked under Linux 2.0.38.
 > 
 > CPU is a Pentium 166 MMX on an Asus TX97 mainboard, ISA cards are a 3c509
 > and a Soundblaster.
 > ...
 > CONFIG_APM=y
 > CONFIG_APM_DO_ENABLE=y
 > CONFIG_APM_CPU_IDLE=y
 > CONFIG_APM_DISPLAY_BLANK=y

Try leaving CONFIG_APM_CPU_IDLE unset. I've learned the hard way that this
option doesn't do any good on many boards, and actually can _increase_ the
CPU temperature by preventing Linux' ordinary "hlt when idle" from triggering.
My ASUS P3B-F + PIII dropped 10+ degrees C when I unset CONFIG_APM_CPU_IDLE.
YMMW, of course.

/Mikael