Linux 系統(tǒng)關(guān)機(jī)后電源無法關(guān)閉的解決辦法

2020-06-21 13:20:00

字體：大中小

供稿：網(wǎng)友

如果一些主板在關(guān)機(jī)之后電源不是自動關(guān)閉，需要手動關(guān)閉電源，請在grub里加上：

引用:

#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,7)/boot/grub/splash.xpm.gz
hiddenmenu
title Fedora (2.6.23.1-42.fc8)
root (hd0,7)
kernel /boot/vmlinuz-2.6.23.1-42.fc8 ro root=LABEL=/1234 rhgb quiet acpi=force
initrd /boot/initrd-2.6.23.1-42.fc8.img

只要加上紅色的那句話就可以正常關(guān)機(jī)。具體原因分析如下：

Kernel 起來以后會執(zhí)行 arch/i386/kernel/setup.c

引用:

void __init setup_arch(char **cmdline_p)
{
unsigned long max_low_pfn;
paravirt_post_allocator_init();
dmi_scan_machine();
}

Dmi_scan_machine() 會從BIOS 里面獲取DMI 支持的信息。ACPI driver 會通過

引用:

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) {
      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) {
      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",
            year, CONFIG_ACPI_BLACKLIST_YEAR);
      return 1;
}
return 0;
}