Public bug reported:
I have wrestled with this for some time and I think I know WHY this
happens.
1: This happens on ALL Debian based kernel systems, not just Ubuntu
based ones
Symptom: Compaq Armada ( possible HP too ) 1700 series systems overheat
and shut down during installation and operation of
Debian/Kubuntu/Knoppix/etc systems. You get maybe 1-2 hours max before
thermal shutdown.
2: Testing: Repeatable. EVERY Compaq Armada show this behavior ( I have
3 Armada 1750s )
3: I have examined the BIOS and have found that the BIOS has an INTERNAL
bug that INVERTS the signal to the internal fan in the Armada. When the
ACPI/APM tells the fan to turn ON, it actually turns the fan OFF. This
has been verified by toggling the ON and OFF states using internal code.
4: MICROSOFT wrote the internal code for Compaq and KNOWS about this
condition; that is why ALL versions of M$ software ( MS-DOS and Windows
) turns the fan on properly. ( this is being sent from an Armada 1750
using W2000, the fan just turned on and STAYS on the right amount of
time )
5: ACPI/APM in Debian TRIES to reduce the temperature. The fan comes on
MOMENTARILY, then is crowbarred off by the bios. This symptom is
repeatable on all systems under Debian software bases.
I know WHY, but I do HARDWARE, I don't ( can't easily ) do Software. My
background is in Failure Analysis, hence my ability to diagnose
problems.
I can't remember if or when I reported this to Debian, but I did this bit of
research some time ago on my FIRST Armada 1750 when the problem came up in
Debian.
The first Distro to fix this issue will resolve a problem that has vexed laptop
owners for years.
They will own the WORLD of laptops that have this bit of M$ code in their BIOS.
You now know WHY.
P.S. I just tried this with FIVE different Debian based Distros. They
ALL exhibited the same problem.
** Affects: Ubuntu
Importance: Undecided
Status: Unconfirmed
--
ACPI/APM does not control fan properly
https://launchpad.net/bugs/77141
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