Messages in this thread | | | Date | Mon, 11 Jun 2007 10:56:52 +0200 | From | Stefan Seyfried <> | Subject | Re: beeping patch for debugging acpi sleep |
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On Sat, Jun 09, 2007 at 03:08:17PM +0200, Pavel Machek wrote:
How about (WARNING! I never have written i386 assembly, my last assembly experience was 20 years ago on Z80, so this is basically just copy'n paste, but i hope you get the idea):
> --- a/arch/i386/kernel/acpi/wakeup.S > +++ b/arch/i386/kernel/acpi/wakeup.S
> @@ -20,6 +35,9 @@ wakeup_code: > wakeup_code_start = . > .code16 > > +# Uncomment this to make your computer start producing ugly noise as soon > +# as BIOS returns to this real-mode entry point.
testl $4, video_flags - wakeup_code jz 1f > + BEEP 1: > movw $0xb800, %ax > movw %ax,%fs > movw $0x0e00 + 'L', %fs:(0x10)
IIUC, then this should make "echo 4 > /proc/sys/kernel/acpi_video_flags" enable the beep at run-time.
Yes, i know, it is not a video flag. And not ACPI. Just add another sysctl if you care. -- Stefan Seyfried QA / R&D Team Mobile Devices | "Any ideas, John?" SUSE LINUX Products GmbH, Nürnberg | "Well, surrounding them's out."
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