Mailinglist Archive: opensuse-factory (1570 mails)

[Roger Luedecke <roger.luedecke@xxxxxxxxx>]

On Thursday, November 10, 2011 03:10:08 AM Richard Brown wrote:
> It might help with power consumption, but in my tests with an intel laptop
> showed some very negative side effects with pcie_aspm enabled - devices
> not resuming from suspend, devices no longer working, etc
>
>
> I think the kernel developers have done the 'right thing' from a code and
> stability point of view - I understand from a battery life point of view
> it might not be ideal but guess that is an issue for device makers or bios
> writers or whoever the heck is responsible for sorting out the steaming
> mess that is aspm
>
>
> People have done extensive testing of a number of the power issues that
> arose with kernel 3.0 and later, you can see our bugzilla results at
> https://bugzilla.novell.com/show_bug.cgi?id=717454
>
>
> There you will see that in our tests, pcie_aspm never seemed to make more
> than 0.9W difference in power consumption, and there were much bigger
> impact, such as the i915 graphics and the need for i915_enable_rc6 to be
> set
>
>
> Again, that parameter, despite its huge impact on power consumption would
> cause a number of issues if set by default, so I'm forced to find myself
> agreeing with the decision to have the defaults as they are - but if
> you're aware of the risks then nothing is stopping you trying these
> settings out for yourself.
>
>
> HTH
>
> > > > Joerg Mayer  11/10/11 9:48 AM >>>
>
> On Wed, Nov 09, 2011 at 08:29:27PM -0800, Greg KH wrote:
> > > pcie_aspm=force fixes power regression issue shown here;
http://www.phoronix.com/scan.php?page=article&item=linux_2638_aspm&num=
> > > 1
> >
> > Only works on some machines, not others, be careful, it can lock your
> > machine up hard.
> >
> > Only enable it if you have tested that you really need it.  You have
> > been warned.
>
> That would be many/most Laptop users?
>
> Ciao
>     Joerg
Thats interesting... but it looks like that Bugzilla was never concluded. For 
me running an Atom the power issues are fixed in 3.0+.
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