Hello! I bought an Acer Aspire 5720z laptop a half year ago. First I had 7.10, since february Hardy beta. Unfortunately I have the same ACPI problem with both versions: When I turn on the computer, the fan goes with full speed. After Ubuntu starts to boot, the fan stops suddenly. Usually the cpu overheats after about 30min and the bios turns the pc off. After turning it immediately on, and booting ubuntu, The fan speed goes up to max, but stays on the maximum forever.
I changed my bios, but the it haven't solve this problem. Then I started to analyze acpi and found an interesting thing: Acpi gets only statically cpu-temp message by the booting. When I start the pc it shows usually 40 C, but if I see the 'sensors' application, I can see that the real temperature goes upper and upper 50-60-70-80.... C and then the turning off by bios. ACPI shows always 40, so as it seems to be low, it won't ever start the fan. After the immediate restarting ACPI shows 70 C and it runs the cpufan on fullspeed. when I look at the sensors data, I can see, that the real cputemp comes down to 25-35C. I can also see cpu speed-step working well, only this fan is the problem for me. I would be very happy if anyone knew the answer for this problem, and naturally I can help you with more infos, if you need. Thanx!!
I have an Acer Aspire 5715z (T2330 processor, BIOS v1.34) running Hardy Heron that never stops its fan.
The fan starts spinning when temp. exceeds 45C, and it gradually decreases, however acpi -t reading does not go lower than 35C. sensors (from lm_sensors) readings go as low as 5C per core! and the fan is still spinning.
Please advise of some solution, otherwise this fan won't last long.
(and I don't know about the implications of running CPU at 5C!)