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SubjectRe: APM realy sucks on 2.6.x
Pavel Machek wrote:
> Hi!
>>My impression is that APM is slowly degenerating while ACPI is not
>>(yet ?) able to fill the gap. The suspend feature of ACPI is stated to
>>be dangerous and experimental and does not work for me at all.
> That sounds about right.
>>After all this bashing...
>>Is there anyone out there who has the same experiences ?
>>Is there a workaround ?
>>Is it possible to somehow downgrade APM in the 2.6 kernel
>>to the 2.4.x state ?
>>How could one debug this kind of missbehaviour ? Where do
>>I have to look for potential miss configurations of the system ?
>>I'm really willing to help the APM developers to track down this bug
>>but don't have a clue how to debug this kind stuff.
> What APM developers? There are none as far as I know.

Hmmm ... So once again the Tooth Fairy and Santa Claus :-) ?

At least a

grep '<.*@' /usr/src/linux-2.6.6/arch/i386/kernel/apm.c | sed 's/.*<//' | sed 's/>.*//'

gives me:


This is pretty much for no one. And I guess you knew since you're on
the list yourself. But I think you're right when meaning
that there is not much of active maintenance anymore. Which at
least I find a little bit discouraging when looking of the state
of the ACPI support.

> Try removing calls to device_* in apm.c. Better yet become APM
> developer.

It seems like I'm on my way to do so (still reluctantly). As I stated
in my previous mails I'm not born as a hardware/BIOS hacker (more the
application C++/Java stuff) but I'm willing to learn. When I'm
grown up I definitely want to be linux kernel hacker :-) ...

Currently I ripped down the 2.6.6 kernel to almost nothing
and add one module after the other checking for proper
suspend/resume behavior....

The most suspicious candidates on my list are currently the
USB-UHCI driver and the ALSA sound system, which is my #1 candidate
since it has not been an integral part of the 2.4.x (x<=20) kernels.

So if anybody out there could give me guidance on how the apm code
might interact with the ALSA sound system it would be highly



> Pavel
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