linux-kernel - Re: [BUG] 2.6.23-rc1 broke APM

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Message-ID: <46A4CE51.2060509@zytor.com>
Date:	Mon, 23 Jul 2007 08:50:41 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mikael Pettersson <mikpe@...uu.se>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] 2.6.23-rc1 broke APM

Mikael Pettersson wrote:
> On this machine (Gigabyte mobo with i815EP chipset and a PIII),
> APM worked fine up to 2.6.22. With 2.6.23-rc1 however the APM
> driver fails to locate the APM bios:
> 
> --- dmesg-2.6.22	2007-07-23 14:07:46.000000000 +0200
> +++ dmesg-2.6.23-rc1	2007-07-23 14:48:24.000000000 +0200
> @@ -102,7 +105,7 @@
>  Unpacking initramfs... done
>  Freeing initrd memory: 976k freed
>  Machine check exception polling timer started.
> -apm: BIOS version 1.2 Flags 0x07 (Driver version 1.16ac)
> +apm: BIOS not found.
>  io scheduler noop registered
>  io scheduler anticipatory registered (default)
>  io scheduler deadline registered
> 
> The only change in 2.6.23-rc1 to arch/i386/kernel/apm.c is a
> trivial nofreeze flag removal, so I suspect the boot code changes,
> perhaps the new arch/i386/boot/apm.c:query_apm_bios().
> 

Seems like a reasonable suspicion.

Could you try the attached patch and:

a) see if it helps the situation, and
b) tell me what it prints?

	-hpa


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