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For broken nForce2 BIOS resulting in XT-PIC timer.
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acpi_sleep= [HW,ACPI] Sleep options
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Format: { s3_bios, s3_mode, s3_beep, s3_leds, s4_nohwsig,
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Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig,
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old_ordering, nonvs, sci_force_enable }
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See Documentation/power/video.txt for information on
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s3_beep is for debugging; it makes the PC's speaker beep
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as soon as the kernel's real-mode entry point is called.
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s4_nohwsig prevents ACPI hardware signature from being
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used during resume from hibernation.
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old_ordering causes the ACPI 1.0 ordering of the _PTS