svn commit: r247086 - head/sys/x86/isa

[Warner Losh]

On May 19, 2013, at 8:21 PM, Alexey Dokuchaev wrote:

> On Thu, Feb 21, 2013 at 06:49:12AM +0000, Alexey Dokuchaev wrote:
>> On Thu, Feb 21, 2013 at 06:38:24AM +0000, Warner Losh wrote:
>>> New Revision: 247086
>>> URL: http://svnweb.freebsd.org/changeset/base/247086
>>> 
>>> Log:
>>>  Correct comment about use of pmtimer, and the real reason it isn't
>>>  used or desirable for amd64.
>> 
>> Thanks!
>> 
>>> + * pmtimer is used only with the old APM power management, and not with
>>> + * acpi, which is required for amd64, so skip it in that case.
>> 
>> Does it also mean it should be removed from ACPI-driven i386 machines kernel
>> configs?
> 
> Apparently not: I've been running FreeBSD 8.4-PRERELEASE without pmtimer for
> a while, and noticed that my laptop stops keeping time during suspend.  I've
> never noticed that behavior before (presumably, with pmtimer).
> 
> I've found this old thread [1] on -current@ from Jan 2001 where src/UPDATING
> is quoted:
> 
>    The new pmtimer device is necessary for laptops.  Failure to
>    include the device will cause suspended laptops losing time
>    when they resume.
> 
> I will soon rebuild the kernel and put pmtimer back to see it fixes time
> keeping for me.  If it will, apparently it is still useful for i386, and
> not just for APM, but ACPI as well...

It fights ACPI in what it does... It was needed for APM... Let me know how it turns out...

Warner


> ./danfe
> 
> [1] http://www.mail-archive.com/freebsd-current@freebsd.org/msg23642.html