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[Launchpad Bug Tracker <209837@xxxxxxxxxxxxxxxxxx>]

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 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!!

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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ACPI fan control problem by ACER
https://bugs.launchpad.net/bugs/209837
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