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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:

<snip>
Ulrich.Windl@rz.uni-regensburg.de
jtoth@princeton.edu
gaudet@arctic.org
cananian@alumni.princeton.edu
echter@informatik.uni-rostock.de
rankinc@bellsouth.net
cmiller@surfsouth.com
rgooch@atnf.csiro.au
rgooch@atnf.csiro.au
laslo@wodip.opole.pl
ross@soi.city.ac.uk
borislav@lix.polytechnique.fr
sitta@al.unipmn.it
teras@writeme.com
Walter.Hofmann@physik.stud.uni-erlangen.de
skawina@geocities.com
rusty@rustcorp.com.au
gis88564@cis.nctu.edu.tw
jima@hal.com
alan@lxorguk.ukuu.org.uk
jima@hal.com
andy_henroid@yahoo.com
pavel@suse.cz
andy_henroid@yahoo.com
zlatko@iskon.hr
crutcher+kernel@datastacks.com
arjanv@redhat.com
marc@mbsi.ca
alan@redhat.com
alan@redhat.com
jdthood@mail.com
chief@bandits.org
ast@domdv.de
rmk@arm.linux.org.uk
jdthood@mail.com
reese@isn.net
neale@lowendale.com.au
cmiller@surfsouth.com
chen@ctpa04.mit.edu
</snip>

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
appreciated....
Thanks

Sebastian



> Pavel
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