Recently I have installed NetBSD on Compal laptop, and it has overheat twice.
It seems to turn off fans. envstat is hanging and power button doesn't do
anything.

Dmesg from that lap:
http://morr.pl/netbsd/hoth.dmesg
Dump of acpidump:
http://morr.pl/netbsd/hoth.acpidump
And dsdt, if it's needed:
http://morr.pl/netbsd/hoth.dsdt

morr

-- 
Daniel Horecki
http://morr.pl