ACPI.PSD

Advanced Configuration and Power Interface (ACPI) platform specific driver (PSD).

PSD=ACPI.PSD <parameters>

Parameters

(Arca Noae)

/AFS

By default ACPI is started from ACPI.PSD. Use this switch to start ACPI from snooper. Use it if using ACPI snooper. Usually you need this if loading ACPI table via snooper. This switch has no effect if using SMP.

/B:name:number

Bus - make the bus %name% with %bus number% work in APIC mode else it remains in PIC mode. In other words, inform all devices on bus %name%, that they are working in APIC mode. If using ACPI snooper then /B is not needed.

/CPUMASK=n

Specifies which CPUs to use. Bit 0 is CPU 0, bit 1 is CPU 1, etc. A 1 bit specifies to use that CPU. A 0 bit specifies to not use that CPU. CPU 0 must always be used. If bit 0 is not set, it will be forced on. This switch specifies the CPU by number, not CPU ID or APIC ID. This switch is useful for not using malfunctioning CPUs such as the fake CPUs created by hyperthreading. Your best choice is always to disable hyperthreading in the BIOS. If you cannot disable hyperthreading in the BIOS, this switch might help. A possible example for a dual core system with hyperthreading enabled is /CPUMASK=5. This will use CPUs 0 and 2, and not use CPUs 1 and 3. Beware that there is no guaranteed way to determine which CPUs are real and which are fake.

/CST:name

Name of method responsible for _CST method.

Example: /CST:XCST. You can find the method in the subtree of CPU. (It's Cx state). It is needed for APM, idle of CPU.

/EIS

"Enable Intel Slack", AcpiGbl_EnableInterpreterSlack - The Intel interpreter strictly follows the ACPI specification. Setting this switch allows the interpreter to ignore certain errors and/or bad AML constructs. Use it if ACPI log contains errors messages.

/IRQ:x

Experimental switch (specially for Acer Ferrari notebook) Allows replace ACPI IRQ number.

/KDBAllows

The use of the kernel debugger using the normal video and keyboard. This feature is provided as-is and may be useful for developers for debugging a specific problem. You should never run your system for normal use with this switch.

WARNING: There is absolutely NO SUPPORT for the use of this feature. Your use of this feature is completely at your own risk. There is no guarantee that it will work, or that your system will even run when using this switch. There is no support for anything for any reason if you use this switch.

/LS:number

Leave Sleep - after sleep state the computer will be switched to this state (0 - no switch, 5 - turn off)

/MAXCPU=1

Only one CPU is used.

/NOACPI

Prevents the PSD from enabling some ACPI services. This switch is experimental.

/Onumber

Output - The number of COM ports used for debug output (values: 1, 2, address of I/O port) It is suitable for debug version of acpi.psd. Configure receiver: 115200,8,n HW flow control

/PIC, /APIC

Multiprocessor support can run in 2 modes: PIC or APIC. PIC is default, Use /PIC to activate 8259 PIC instead of APIC.

• PIC is good enough
• APIC is better but doesn't work on some computers and requires extra efforts to setup computer.

/SMP

Activate multi-processor support

/NOD

(Enabled by default) Experimental switch to activate internal OEMHLP$ driver disable acpica.add if using this switch. APIC mode may work bad without this switch.

/!NOD

Disable internal OEMHLP$ driver. Don't forget activate acpica.add (read troubleshooting.doc)

/R

Use ACPI Reset instead of kernel's reset. It is useful if running SMP kernel only. Use it if have troubles with system reboot or shutdown.

/FS

"Full Safe" - use this key for Dell notebooks

This switches are useful for APIC mode only:

/CD

"Crazy Device" - use this switch if USB doesn't work

/TMR

Use it if running SMP machine and the motherboard doesn't follow MPS 1.4 standard.

/DV:vector

Dummy Vector - hide the vector. The kernel will not process it. (/DV:0x57 is enabled by default on every PC now)

/Q

Quiet mode. It does not show any message on normal boot.

Note

All digital values are accepted in hex or decimal form:

0x??? (hex)
0??   (octal)
???   (decimal)

Links

• ACPI Wiki page at Arca Noae