Booting again with noapic and noapictimer flags
give much the same result, except that it doesn't hang and I don't
have to keep hitting keys to make the boot continue.

However, my last post was somewhat wrong.

The fan *is* running, but at a constant low speed.     You can hear it if you
put your ear up to the air vents, and feel a breath of warm air.  This may
be new behavior, but it's far from full speed -- you can hear it rev up in the
first few seconds of the boot process.

Most importantly, it's not being thermostatically controlled.
CPU temperature will get up to 55C, and the fan gets no noisier even when the 
CPU
is quite hot.

There are no files named *thermal* in /proc, except the empty /proc/thermal_zone
directory:
$ cd /proc;
$ find . -name '*thermal*' -print
./acpi/thermal_zone
$

There are some thermal devices in /sys, and I attach the list as
sys_thermal.txt

Also, note that the error in /var/log/syslog is still there:
Sep 11 20:21:40 nglap kernel: [    2.379917] ACPI Exception (thermal-0377): 
AE_OK, No or invalid critical threshold [20080609]


** Attachment added: "sys_thermal.txt"
   http://launchpadlibrarian.net/17543014/sys_thermal.txt

-- 
thermal.ko fails -> no fan on laptop
https://bugs.launchpad.net/bugs/250241
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