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

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Message-Id: <200802061825.21692.rjw@sisk.pl>
Date:	Wed, 6 Feb 2008 18:25:20 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
Cc:	"Kok, Auke" <auke-jan.h.kok@...el.com>,
	?????? ??????????? <penguinista@...l.net.mk>,
	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

On Wednesday, 6 of February 2008, Pavel Machek wrote:
> On Tue 2008-02-05 16:22:55, Kok, Auke wrote:
> > ?????? ??????????? wrote:
> > >>>>> 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?
> > 
> > did the Kconfig not come with a big fat (EXPERIMENTAL) ?
> 
> (EXPERIMENTAL) is something different from (KNOWN BROKEN).
> 
> If we know about broken setups, we should probably be blacklisting
> them.

Well, the ASPM thing seems to break every single setup I've tested.  So,
perhaps we should whitelist the working ones?

Rafael
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