linux-kernel - Re: PCIE ASPM support hangs my laptop pretty often

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Date:	Wed, 6 Feb 2008 01:05:44 +0100
From:	Дамјан Георгиевски 
	<penguinista@...l.net.mk>
To:	"Kok, Auke" <auke-jan.h.kok@...el.com>
Cc:	Greg KH <greg@...ah.com>, Arjan van de Ven <arjan@...radead.org>,
	Shaohua Li <shaohua.li@...el.com>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-pci <linux-pci@...ey.karlin.mff.cuni.cz>
Subject: Re: PCIE ASPM support hangs my laptop pretty often

> >>> I've patched my kernel with the PCIe ASPM and after setting
> >>> echo powersave > /sys/module/pcie_aspm/parameters/policy
> >>>
> >>> I started to experience random hangs of my laptop.
> >>> Hardware info:
> >>> Thinkpad x60s 1704-5UG
> >>
> >> the x60's chipset doesn't support ASPM properly afaik... bad idea.
> >
> > Well, the code shouldn't then cause a crash of the machine :)
>
> The user enabled it specifically (where it is disabled by default)
>
> ASPM has been crashing e1000(e), which is why I've recently merged a patch
> to disable L1 ASPM for the onboard 82573 nic on those platforms.
>
> this new infrastructure should work in the default configuration - enabling
> ASPM where this system leaves it disabled is expected to give problems
> unless you know what you are doing.

In my defense, the patch documentation didn't say it doesn't work with my 
hardware, nor that it hangs the chipset :) and the promised 1.3w surelly 
looked nice.

So, are there any benefits of ASPM if I have it in the kernel but it's set to 
default? I got the impression that "default" means not much power savings?


-- 
Damjan Georgievski
Free Software Macedonia
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