Mailinglist Archive: opensuse-factory (1570 mails)

["Richard Brown" <rdb@xxxxxxxxx>]

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
-- 
Joerg Mayer                                           
We are stuck with technology when what we really want is just stuff that
works. Some say that should read Microsoft instead of technology.
-- 
To unsubscribe, e-mail: opensuse-factory+unsubscribe@xxxxxxxxxxxx
To contact the owner, e-mail: opensuse-factory+owner@xxxxxxxxxxxx



--
To unsubscribe, e-mail: opensuse-factory+unsubscribe@xxxxxxxxxxxx
To contact the owner, e-mail: opensuse-factory+owner@xxxxxxxxxxxx