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[Danny Edel <728733@xxxxxxxxxxxxxxxxxx>]

Regarding thermald: I have installed it and if I understand the manual
correctly, it can only act with fans that are already registered in
sysfs as cooling devices.

If I go to /sys/class/thermal I have two cooling_devices (the CPU and
the LCD, no fans here). The CPU's cur_state affects throttling, while
the LCD's controls brightness. If I write 90000 (90 °C) to
thermal_zone0's emul_temp, the system becomes really slow (throttling at
work), but the fan does not react (I assume it's controlled purely by
BIOS because of the suspend/wake-up cycle).

So I believe the real issue here is that linux does not see the fan
control and leaves the control to the BIOS (which is fine for me) after
a wakeup, but still it stops the fan while starting the kernel (which
sounds like a bug to me), apparently deactivating BIOS' own fancontrol
routine. (Maybe it accidentally writes to the same register as Acer's
fancontrol application, signaling the BIOS that fancontrol is now
running, but this is pure speculation.)

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https://bugs.launchpad.net/bugs/728733

Title:
  fan only works when my acer 5315 is booted then stops

Status in acpi package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Binary package hint: acpi

  fan only works when my acer 5315 is booted then stops.i have a acer
  aspire 5315 laptop. My fan stopped working after installing ubuntu
  from vista. ive changed it for a new one and still the same problem.
  no dust aswel. please help

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: acpi 1.5-2
  ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
  Uname: Linux 2.6.35-22-generic i686
  Architecture: i386
  Date: Thu Mar  3 22:18:12 2011
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
  ProcEnviron:
   LANG=en_GB.utf8
   SHELL=/bin/bash
  SourcePackage: acpi

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