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[acpi] Allow time for ACPI power off to take effect

The ACPI power off sequence may not take effect immediately.  Delay
for one second, to eliminate potentially confusing log messages such
as "Could not power off: Error 0x43902001 (http://ipx".

Reported-by: Leonid Vasetsky <leonidv@velostrata.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
tags/v1.20.1
Michael Brown 8 years ago
parent
commit
df85901768
1 changed files with 6 additions and 0 deletions
  1. 6
    0
      src/arch/x86/interface/pcbios/acpipwr.c

+ 6
- 0
src/arch/x86/interface/pcbios/acpipwr.c View File

@@ -23,6 +23,7 @@
23 23
 
24 24
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
25 25
 
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+#include <unistd.h>
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 #include <errno.h>
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 #include <byteswap.h>
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 #include <realmode.h>
@@ -111,6 +112,11 @@ int acpi_poweroff ( void ) {
111 112
 			 ACPI_PM1_CNT_SLP_EN ), pm1b_cnt );
112 113
 	}
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+	/* On some systems, execution will continue briefly.  Delay to
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+	 * avoid potentially confusing log messages.
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+	 */
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+	mdelay ( 1000 );
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+
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 	DBGC ( colour, "ACPI power off failed\n" );
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 	return -EPROTO;
116 122
 }

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