linux-kernel - Re: Power regression found on 3.6-rc1+

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Date:	Mon, 29 Oct 2012 08:49:38 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Micael <kam1kaz3@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Linux PM list <linux-pm@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Zheng Yan <zheng.z.yan@...el.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Huang Ying <ying.huang@...el.com>
Subject: Re: Power regression found on 3.6-rc1+

On Friday, October 26, 2012 12:37:36 AM Micael wrote:
> I have a laptop running Arch Linux and found that upgrading from 3.5.6
> to 3.6.2 had a huge impact on my battery life. Power consumption went
> from ~10W to ~20W.
> I initially thought it was a i915 driver problem since the CPU temps
> went up and so I opened this bug:
> https://bugzilla.kernel.org/show_bug.cgi?id=49031
> 
> However, as you can see if you read the bug's comments, after
> bisecting this I found the culprit to be commit
> 71a83bd727cc31c5fe960c3758cb396267ff710e:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=71a83bd727cc31c5fe960c3758cb396267ff710e

I wonder what the problem may be here.

It looks like the polling change in pci_pme_list_scan() is causing problems
to happen.

Thanks,
Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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