ACPIREG_PM2_CNT
case ACPIREG_PM2_CNT:
acpi_write_pmreg(sc, ACPIREG_PM2_CNT, 0, ACPI_PM2_ARB_DIS);
rega = acpi_read_pmreg(sc, ACPIREG_PM2_CNT, 0);
acpi_write_pmreg(sc, ACPIREG_PM2_CNT, 0, rega);