[ltp] Hot Sleep

Crispin Cowan linux-thinkpad@linux-thinkpad.org
Sun, 02 May 2004 13:53:57 -0700


In all of my previous laptops (Toshiba Tecra 700, Toshiba Tecra 530, and 
IBM Thinkpad 770Z) suspend to RAM has burned about 1% of battery per 
hour, and the machine was cool to the touch. With my new T40, it sleeps 
rather more hot. Even when it has been suspended for hours, it is hot to 
the touch, and looking at the change in battery levels, it is burning at 
least 10% of battery power per hour while suspended.

Is this a normal new effect of suspend to RAM on the T40? Is the ACPI 
suspend driver somehow failing to power down a hot component?

I'm running SuSE 9.1 (the new one) and using ACPI. I suspend the machine 
with "echo -n "mem" > /sys/power/state" and wake it by pressing the 
power button.

Thanks,
    Crispin

-- 
Crispin Cowan, Ph.D.  http://immunix.com/~crispin/
CTO, Immunix          http://immunix.com