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Bug#631866: linux-source-2.6.39: no APM support even when compiled in AND booted with apm=on



On Mon, Jun 27, 2011 at 11:21:26PM +0100, Ben Hutchings wrote:
> On Mon, Jun 27, 2011 at 11:28:34PM +0200, Hans Ekbrand wrote:
> > Package: linux-source-2.6.39
> > Version: 2.6.39-2
> > Severity: normal
> > 
> > Summary: I recompiled with make menuconfig, loaded the default
> > config for linux-image-2.6.39-486-2 into menuconfig, disabled ACPI,
> > enabled APM (but not the sub-items of APM in menuconfig). Then
> > booted this image with "apm=on" and now:
> > 
> > # apm -S
> > No APM support in kernel
> 
> So apm lies...
> 
> > selected output from dmesg:
> > 
> > $ dmesg | grep -i apm 
> > [    0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-2.6.39 root=/dev/mapper/amin-root ro apm=on quiet
> > [   12.378224] apm: BIOS not found.
> [...]
> 
> Well, are you sure that this machine does have APM BIOS support?
> Because the kernel cannot use APM that is not there...

Yes I am sure, because apm -S has worked perfectly on this particular
machine with older kernels. Could it be a battery thing? Otherwise I
know APM is supported by that BIOS.

This is an old compaq laptop, "Armada 1540D", so I don't expect the
BIOS to be perfectly compliant with the standards. But it did work
with older official debian kernels, however, this is the first time I
have tried a custom kernel on it.

That I did not enable the sub-itmes of APM in menuconfig, might that
be a problem? They were described as "(NEW)", so I thought that they
cannot be necessary, but later on I saw that they have been "(NEW)"
for the last ten years or so :-)

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