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&n...
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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