Re: PCIE ASPM support hangs my laptop pretty often

Pavel Machek
2008-02-06T14:11:08Z

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.

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