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

From: Darren Salt <linux@youmustbejoking.demon.co.uk>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
	"Rafael J. Wysocki" <rjw@sisk.pl>, Len Brown <lenb@kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Jesse Barnes <jbarnes@virtuousgeek.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Matthew Garrett <mjg@redhat.com>,
	Corentin Chary <corentincj@iksaif.net>
Subject: Re: Oopses and ACPI problems (Linus 2.6.29-rc4)
Date: Tue, 10 Feb 2009 14:12:44 +0000	[thread overview]
Message-ID: <5030E21460%linux@youmustbejoking.demon.co.uk> (raw)
In-Reply-To: <20090209234911.GB862@elte.hu>

[Adding Matthew Garrett & Corentin Chary to Cc]

I demand that Ingo Molnar may or may not have written...

> * Darren Salt <linux@youmustbejoking.demon.co.uk> wrote:
>> I'm seeing various oopses with -rc4, where -rc3 is fine; config, dmesg
>> (captured via netconsole) and decoded oops data attached ¹. The last few
>> oopses were followed by a scrambled display and a hard lockup.

>> All oopses follow an otherwise successful suspend-to-RAM.

> Various folks Cc:-ed. There's been a late, rather large ACPI merge, so
> one post-rc3 suspect would be one of these commits:

[snip]
> 7695fb0: eeepc-laptop: fix oops when changing backlight brightness during
eeepc-laptop init

No, that one's harmless :-)

[snip]
> 2b25c9f: eeepc-laptop: use netlink interface

That one makes acpid (apparently) useless. The rest of the commit description
is:
    To be prepared for /proc/acpi/event removal we export events
    also through generic netlink interface.

Note that "also". The actual effect of the patch is "instead".

Adding the two removed lines (but removing the post-increment of the event
count) fixes this.

> 5740294: eeepc-laptop: Implement rfkill hotplugging in eeepc-laptop

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.

(901; BIOS rev. 1808.)

[snip]
> 2a7dc0d: asus-laptop: use generic netlink interface

That one also says "also" where it should say "instead" (not that it affects
me).

... oh yes, there's a long delay between output of these two lines during
boot:
  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.*.)

Anyway, a patch for the ACPI reporting problems will follow this message.

[snip]
-- 
| Darren Salt    | linux or ds at              | nr. Ashington, | Toon
| RISC OS, Linux | youmustbejoking,demon,co,uk | Northumberland | Army
| + Output less CO2 => avoid massive flooding.    TIME IS RUNNING OUT *FAST*.

Life is that brief interlude between nothingness and eternity.
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