linux-kernel - Re: Oopses and ACPI problems (Linus 2.6.29-rc4)

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Date:	Tue, 10 Feb 2009 15:15:21 +0000
From:	Darren Salt <linux@...mustbejoking.demon.co.uk>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	Len Brown <lenb@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Corentin Chary <corentincj@...aif.net>
Subject: Re: Oopses and ACPI problems (Linus 2.6.29-rc4)

I demand that Matthew Garrett may or may not have written...

> On Tue, Feb 10, 2009 at 02:12:44PM +0000, Darren Salt wrote:
>> Reverting this fixes the rfkill oops; things work correctly again. I don't
>> know why this appears to be needed, since things work fine without this
>> patch ‒ both Fn-F2 and echoing to /sys/class/rfkill/rfkill0/state ‒ even
>> when I start up with init=/bin/sh and test directly from that shell.

> If this is BIOS version specific I'm going to be upset, but the general
> case behaviour is that rfkill only works on the 901 if you either (a) pass
> force=1 to pciehp (which you shouldn't) or (b) have native support in a
> driver. My /guess/ is that you've got pciehp loaded, and there's some kind
> of awkward race between it and eeepc-laptop.

I have; and yes, pciehp_force=1.

As things stand, this is likely to be a problem for anybody using lenny on
Eee hardware and upgrading (on their own) to 2.6.29, given that that
workaround is present in eeepc-acpi-scripts in lenny.

Anyway, removing that option fixes the problem.

>> [long delay between these two lines]
>>   input: ETPS/2 Elantech Touchpad as /class/input/input5
>>   eeepc: Hotkey init flags 0x41
>> (not seen in .28 or .28.1; not checked later .28.*.)

> BIOS bug. There's an explicit delay in the eee bios for some reason, and 
> I haven't found any straightforward way to avoid it.

BIOS bug or no, the fact remains that this is (AFAICS) a regression.

-- 
| Darren Salt    | linux or ds at              | nr. Ashington, | Toon
| RISC OS, Linux | youmustbejoking,demon,co,uk | Northumberland | Army
| + Use more efficient products. Use less.          BE MORE ENERGY EFFICIENT.

  10 PRINT "I used to do this in Dixons": POKE 23692,255: GO TO 10
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