ACPI: make blacklist more verbose (5b27b176) · Commits · 戴 / test

IMHO, ACPI disabled due to DMI failure or blacklisted year should be noted, as is done with other ACPI blacklisting. This will help people troubleshoot when ACPI isn't working. Status quo is a mysterious "ACPI Disabled" message without explanation on BIOS that implements ACPI but not DMI. This is actually fairly common on embedded x86 boards. Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Len Brown <len.brown@intel.com>

drivers/acpi/blacklist.c

+8 −2

Original line number	Diff line number	Diff line
		@@ -79,11 +79,17 @@ static int __init blacklist_by_year(void)
		{
		int year = dmi_get_year(DMI_BIOS_DATE);
		/* Doesn't exist? Likely an old system */
		if (year == -1)
		if (year == -1) {
		printk(KERN_ERR PREFIX "no DMI BIOS year, "
		"acpi=force is required to enable ACPI\n" );
		return 1;
		}
		/* 0? Likely a buggy new BIOS */
		if (year == 0)
		if (year == 0) {
		printk(KERN_ERR PREFIX "DMI BIOS year==0, "
		"assuming ACPI-capable machine\n" );
		return 0;
		}
		if (year < CONFIG_ACPI_BLACKLIST_YEAR) {
		printk(KERN_ERR PREFIX "BIOS age (%d) fails cutoff (%d), "
		"acpi=force is required to enable ACPI\n",

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