1.\" 2.\" Copyright (c) 2001 Michael Smith 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $FreeBSD: src/share/man/man4/acpi.4,v 1.61.8.1 2009/04/15 03:14:26 kensmith Exp $ 27.\" 28.Dd July 25, 2024 29.Dt ACPI 4 30.Os 31.Sh NAME 32.Nm acpi 33.Nd Advanced Configuration and Power Management support 34.Sh SYNOPSIS 35.Cd "device acpi" 36.Pp 37.Cd "options ACPI_DEBUG" 38.Cd "options DDB" 39.Sh DESCRIPTION 40The 41.Nm 42driver provides support for the Intel/Microsoft/Compaq/Toshiba ACPI 43standard. 44This support includes platform hardware discovery (superseding the 45PnP and PCI BIOS), as well as power management (superseding APM) and 46other features. 47ACPI core support is provided by the ACPICA reference implementation 48from Intel. 49.Pp 50The 51.Nm 52driver is usually compiled into the kernel, and it is automatically loaded 53by the 54.Xr loader 8 55if it is not in the kernel configuration file. 56The loader menu provides a menu item to boot without ACPI. 57See also 58.Sx DISABLING ACPI 59below. 60.Sh SYSCTL VARIABLES 61The 62.Nm 63driver is intended to provide power management without user intervention. 64If the default settings are not optimal, the following sysctls can be 65used to modify or monitor 66.Nm 67behavior. 68.Bl -tag -width indent 69.It Va debug.acpi.enable_debug_objects 70Enable dumping Debug objects without 71.Cd "options ACPI_DEBUG" . 72Default is 0, ignore Debug objects. 73.It Va hw.acpi.acline 74AC line state (1 means online, 0 means on battery power). 75.It Va hw.acpi.cpu.cx_usage 76Debugging information listing the percent of total usage for each sleep state. 77The values are reset when 78.Va hw.acpi.cpu.cx_lowest 79is modified. 80.It Va hw.acpi.cpu.cx_lowest 81Lowest Cx state to use for idling the CPU. 82A scheduling algorithm will select states between 83.Li C1 84and this setting 85as system load dictates. 86To enable ACPI CPU idling control, 87.Va machdep.cpu_idle_hlt 88must be set to 2 (the default value). 89.It Va hw.acpi.cpu.cx_supported 90List of supported CPU idle states and their transition latency 91in microseconds. 92Each state has a type (e.g., 93.Li C2 ) . 94.Li C1 95is equivalent to the ia32 96.Li HLT 97instruction, 98.Li C2 99provides a deeper 100sleep with the same semantics, and 101.Li C3 102provides the deepest sleep 103but additionally requires bus mastering to be disabled. 104States greater than 105.Li C3 106provide even more power savings with the same 107semantics as the 108.Li C3 109state. 110Deeper sleeps provide more power savings but increased transition 111latency when an interrupt occurs. 112.It Va hw.acpi.disable_on_reboot 113Disable ACPI during the reboot process. 114Most systems reboot fine with ACPI still enabled, but some require 115exiting to legacy mode first. 116Default is 0, leave ACPI enabled. 117.It Va hw.acpi.handle_reboot 118Use the ACPI Reset Register capability to reboot the system. 119Default is 0, use legacy reboot support. 120Some newer systems require use of this register, while some only work 121with legacy rebooting support. 122.It Va hw.acpi.lid_switch_state 123Suspend state 124.Pq Li S1 Ns \[en] Ns Li S5 125to enter when the lid switch (i.e., a notebook screen) is closed. 126Default is 127.Dq Li NONE 128(do nothing). 129.It Va hw.acpi.power_button_state 130Suspend state 131.Pq Li S1 Ns \[en] Ns Li S5 132to enter when the power button is pressed. 133Default is 134.Li S5 135(power-off nicely). 136.It Va hw.acpi.reset_video 137Reset the video adapter from real mode during the resume path. 138Some systems need this help, others have display problems if it is enabled. 139Default is 0 (disabled). 140.It Va hw.acpi.s4bios 141Indicate whether the system supports 142.Li S4BIOS . 143This means that the BIOS can handle all the functions of suspending the 144system to disk. 145Otherwise, the OS is responsible for suspending to disk 146.Pq Li S4OS . 147Most current systems do not support 148.Li S4BIOS . 149.It Va hw.acpi.sleep_button_state 150Suspend state 151.Pq Li S1 Ns \[en] Ns Li S5 152to enter when the sleep button is pressed. 153This is usually a special function button on the keyboard. 154Default is 155.Li S3 156(suspend-to-RAM). 157.It Va hw.acpi.sleep_delay 158Wait this number of seconds between preparing the system to suspend and 159actually entering the suspend state. 160Default is 1 second. 161.It Va hw.acpi.supported_sleep_state 162Suspend states 163.Pq Li S1 Ns \[en] Ns Li S5 164supported by the BIOS. 165.Bl -tag -width indent 166.It Li S1 167Quick suspend to RAM. 168The CPU enters a lower power state, but most peripherals are left running. 169.It Li S2 170Lower power state than 171.Li S1 , 172but with the same basic characteristics. 173Not supported by many systems. 174.It Li S3 175Suspend to RAM. 176Most devices are powered off, and the system stops running except for 177memory refresh. 178.It Li S4 179Suspend to disk. 180All devices are powered off, and the system stops running. 181When resuming, the system starts as if from a cold power on. 182Not yet supported by 183.Fx 184unless 185.Li S4BIOS 186is available. 187.It Li S5 188System shuts down cleanly and powers off. 189.El 190.It Va hw.acpi.verbose 191Enable verbose printing from the various ACPI subsystems. 192.El 193.Sh LOADER TUNABLES 194Tunables can be set at the 195.Xr loader 8 196prompt before booting the kernel or stored in 197.Pa /boot/loader.conf . 198Many of these tunables also have a matching 199.Xr sysctl 8 200entry for access after boot. 201.Bl -tag -width indent 202.It Va acpi_dsdt_load 203Enables loading of a custom ACPI DSDT. 204.It Va acpi_dsdt_name 205Name of the DSDT table to load, if loading is enabled. 206It is relative to 207.Pa /boot/kernel . 208.It Va debug.acpi.allow_method_calls 209If set, the 210.Xr acpicall 8 211utility can be used to directly call ACPI methods for debugging and 212tweaking purposes. 213.It Va debug.acpi.disabled 214Selectively disables portions of ACPI that are enabled by default, for 215debugging purposes. 216.It Va debug.acpi.enabled 217Selectively enables portions of ACPI that are disabled by default, for 218debugging purposes. 219.It Va debug.acpi.facs_addr32 220Favor 32-bit FACS table addresses over the 64-bit addresses. 221.It Va debug.acpi.fadt_addr32 222Favor 32-bit FADT register addresses over the 64-bit addresses. 223.It Va debug.acpi.ignore_xsdt 224Ignore the XSDT, forcing the use of the RSDT. 225.It Va debug.acpi.interpreter_slack 226Enable less strict ACPI implementations. 227Default is 1, ignore common BIOS mistakes. 228.It Va debug.acpi.max_threads 229Specify the number of task threads that are started on boot. 230Limiting this to 1 may help work around various BIOSes that cannot 231handle parallel requests. 232The default value is 3. 233.It Va debug.acpi.quirks 234Override any automatic quirks completely. 235.It Va debug.acpi.resume_beep 236Beep the PC speaker on resume. 237This can help diagnose suspend/resume problems. 238Default is 0 (disabled). 239.It Va hint.acpi.0.disabled 240Set this to 1 to disable all of ACPI. 241If ACPI has been disabled on your system due to a blacklist entry for your 242BIOS, you can set this to 0 to re-enable ACPI for testing. 243.It Va hw.acpi.ec.poll_timeout 244Delay in milliseconds to wait for the EC to respond. 245Try increasing this number if you get the error 246.Qq Li AE_NO_HARDWARE_RESPONSE . 247.It Va hw.acpi.host_mem_start 248Override the assumed memory starting address for PCI host bridges. 249.It Va hw.acpi.install_interface , hw.acpi.remove_interface 250Install or remove OS interface(s) to control the return value of the 251.Ql _OSI 252query method. 253When an OS interface is specified in 254.Va hw.acpi.install_interface , 255the 256.Li _OSI 257query for the interface returns it is 258.Em supported . 259Conversely, when an OS interface is specified in 260.Va hw.acpi.remove_interface , 261the 262.Li _OSI 263query returns it is 264.Em not supported . 265Multiple interfaces can be specified in a comma-separated list and 266any leading white spaces will be ignored. 267For example, 268.Qq Li FreeBSD, Linux 269is a valid list of two interfaces 270.Qq Li FreeBSD 271and 272.Qq Li Linux . 273.It Va hw.acpi.override_isa_irq_polarity (x86) 274Forces active-lo polarity for edge-triggered ISA interrupts. 275Some older systems incorrectly specify active-lo polarity for ISA 276interrupts and this override fixes those systems. 277This override is enabled by default on systems with Intel CPUs, 278but can be enabled or disabled by setting the tunable explicitly. 279.It Va hw.acpi.reset_video 280Enables calling the VESA reset BIOS vector on the resume path. 281This can fix some graphics cards that have problems such as LCD white-out 282after resume. 283Default is 0 (disabled). 284.It Va hw.acpi.auto_serialize_methods 285Auto-serialization of control methods to proactively prevent problems with 286ill-behaved reentrant control methods that create named ACPI objects. 287Default is 1 (enabled). 288.It Va hw.acpi.verbose 289Turn on verbose debugging information about what ACPI is doing. 290.It Va hw.pci.link.%s.%d.irq 291Override the interrupt to use for this link and index. 292This capability should be used carefully, and only if a device is not 293working with 294.Nm 295enabled. 296.Qq %s 297is the name of the link (e.g., LNKA). 298.Qq %d 299is the resource index when the link supports multiple IRQs. 300Most PCI links only have one IRQ resource, so the below form should be used. 301.It Va hw.pci.link.%s.irq 302Override the interrupt to use. 303This capability should be used carefully, and only if a device is not 304working with 305.Nm 306enabled. 307.Qq %s 308is the name of the link (e.g., LNKA). 309.El 310.Sh DISABLING ACPI 311Since ACPI support on different platforms varies greatly, there are many 312debugging and tuning options available. 313.Pp 314For machines known not to work with 315.Nm 316enabled, there is a BIOS blacklist. 317Currently, the blacklist only controls whether 318.Nm 319should be disabled or not. 320In the future, it will have more granularity to control features (the 321infrastructure for that is already there). 322.Pp 323To enable 324.Nm 325(for debugging purposes, etc.) on machines that are on the blacklist, set the 326kernel environment variable 327.Va hint.acpi.0.disabled 328to 0. 329Before trying this, consider updating your BIOS to a more recent version that 330may be compatible with ACPI. 331.Pp 332To disable the 333.Nm 334driver completely, set the kernel environment variable 335.Va hint.acpi.0.disabled 336to 1. 337.Pp 338Disabling all or part of ACPI may result in a non-functional system. 339.Pp 340The 341.Nm 342driver comprises a set of drivers, which may be selectively disabled 343in case of problems. 344To disable a sub-driver, list it in the kernel 345environment variable 346.Va debug.acpi.disabled . 347Multiple entries can be listed, separated by a space. 348.Pp 349ACPI sub-devices and features that can be disabled: 350.Bl -tag -width ".Li sysresource" 351.It Li all 352Disable all ACPI features and devices. 353.It Li acad 354.Pq Vt device 355Supports AC adapter. 356.It Li bus 357.Pq Vt feature 358Probes and attaches subdevices. 359Disabling will avoid scanning the ACPI namespace entirely. 360.It Li children 361.Pq Vt feature 362Attaches standard ACPI sub-drivers and devices enumerated in the 363ACPI namespace. 364Disabling this has a similar effect to disabling 365.Dq Li bus , 366except that the 367ACPI namespace will still be scanned. 368.It Li button 369.Pq Vt device 370Supports ACPI button devices (typically power and sleep buttons). 371.It Li cmbat 372.Pq Vt device 373Control-method batteries device. 374.It Li cpu 375.Pq Vt device 376Supports CPU power-saving and speed-setting functions. 377.It Li cpu_cst 378.Pq Vt device 379Supports CPU power-saving. 380Disabling 381.Dq Li cpu 382will also disable this device. 383.It Li cpu_pst 384.Pq Vt device 385Supports CPU speed-setting. 386Disabling 387.Dq Li cpu 388will also disable this device. 389.It Li dock 390.Pq Vt device 391Docking station device. 392.It Li ec 393.Pq Vt device 394Supports the ACPI Embedded Controller interface, used to communicate 395with embedded platform controllers. 396.It Li hpet 397.Pq Vt feature 398Supports the High Precision Event Timer. 399.It Li isa 400.Pq Vt device 401Supports an ISA bus bridge defined in the ACPI namespace, 402typically as a child of a PCI bus. 403.It Li lid 404.Pq Vt device 405Supports an ACPI laptop lid switch, which typically puts a 406system to sleep. 407.It Li quirks 408.Pq Vt feature 409Do not honor quirks. 410Quirks automatically disable ACPI functionality based on the XSDT table's 411OEM vendor name and revision date. 412.It Li pci 413.Pq Vt device 414Supports Host to PCI bridges. 415.It Li pci_link 416.Pq Vt feature 417Performs PCI interrupt routing. 418.It Li sysresource 419.Pq Vt device 420Pseudo-devices containing resources which ACPI claims. 421.It Li thermal 422.Pq Vt device 423Supports system cooling and heat management. 424.It Li timer 425.Pq Vt device 426Implements a timecounter using the ACPI fixed-frequency timer. 427.It Li video 428.Pq Vt device 429Supports 430.Xr acpi_video 4 431which may conflict with 432.Xr agp 4 433device. 434.El 435.Pp 436.\"The 437.\".Nm 438.\"driver comprises a set of drivers, 439.\"which may be selectively enabled in case of testing. 440.\"To enable a sub-driver, 441.\"list it in the kernel environment variable 442.\".Va debug.acpi.enabled . 443.\"Multiple entries can be listed, 444.\"separated by a space. 445.\".Pp 446.\"ACPI sub-devices and features that can be enabled: 447.\".Bl -tag -width ".Li sysresource" 448.\"[...] 449.\".El 450.\".Pp 451It is also possible to avoid portions of the ACPI namespace which 452may be causing problems, by listing the full path of the root of 453the region to be avoided in the kernel environment variable 454.Va debug.acpi.avoid . 455The object and all of its children will be ignored during the 456bus/children scan of the namespace. 457The ACPICA code will still know about the avoided region. 458.Sh DEBUGGING OUTPUT 459To enable debugging output, 460.Nm 461must be compiled with 462.Cd "options ACPI_DEBUG" . 463Debugging output is separated between layers and levels, where a layer is 464a component of the ACPI subsystem, and a level is a particular kind 465of debugging output. 466.Pp 467Both layers and levels are specified as a whitespace-separated list of 468tokens, with layers listed in 469.Va debug.acpi.layer 470and levels in 471.Va debug.acpi.level . 472.Pp 473The first set of layers is for ACPICA components, and the second is for 474.Dx 475drivers. 476The ACPICA layer descriptions include the prefix for the files they 477refer to. 478The supported layers are: 479.Pp 480.Bl -tag -compact -width ".Li ACPI_CA_DISASSEMBLER" 481.It Li ACPI_UTILITIES 482Utility ("ut") functions 483.It Li ACPI_HARDWARE 484Hardware access ("hw") 485.It Li ACPI_EVENTS 486Event and GPE ("ev") 487.It Li ACPI_TABLES 488Table access ("tb") 489.It Li ACPI_NAMESPACE 490Namespace evaluation ("ns") 491.It Li ACPI_PARSER 492AML parser ("ps") 493.It Li ACPI_DISPATCHER 494Internal representation of interpreter state ("ds") 495.It Li ACPI_EXECUTER 496Execute AML methods ("ex") 497.It Li ACPI_RESOURCES 498Resource parsing ("rs") 499.It Li ACPI_CA_DEBUGGER 500Debugger implementation ("db", "dm") 501.It Li ACPI_OS_SERVICES 502Usermode support routines ("os") 503.It Li ACPI_CA_DISASSEMBLER 504Disassembler implementation (unused) 505.It Li ACPI_ALL_COMPONENTS 506All the above ACPICA components 507.It Li ACPI_AC_ADAPTER 508AC adapter driver 509.It Li ACPI_BATTERY 510Control-method battery driver 511.It Li ACPI_BUS 512ACPI, ISA, and PCI bus drivers 513.It Li ACPI_BUTTON 514Power and sleep button driver 515.It Li ACPI_EC 516Embedded controller driver 517.It Li ACPI_FAN 518Fan driver 519.It Li ACPI_OEM 520Platform-specific driver for hotkeys, LED, etc. 521.It Li ACPI_POWERRES 522Power resource driver 523.It Li ACPI_PROCESSOR 524CPU driver 525.It Li ACPI_THERMAL 526Thermal zone driver 527.It Li ACPI_TIMER 528Timer driver 529.It Li ACPI_ALL_DRIVERS 530All the above 531.Dx 532ACPI drivers 533.El 534.Pp 535The supported levels are: 536.Pp 537.Bl -tag -compact -width ".Li ACPI_LV_AML_DISASSEMBLE" 538.It Li ACPI_LV_INIT 539Initialization progress 540.It Li ACPI_LV_DEBUG_OBJECT 541Stores to objects 542.It Li ACPI_LV_INFO 543General information and progress 544.It Li ACPI_LV_REPAIR 545Repair a common problem with predefined methods 546.It Li ACPI_LV_ALL_EXCEPTIONS 547All the previous levels 548.It Li ACPI_LV_PARSE 549.It Li ACPI_LV_DISPATCH 550.It Li ACPI_LV_EXEC 551.It Li ACPI_LV_NAMES 552.It Li ACPI_LV_OPREGION 553.It Li ACPI_LV_BFIELD 554.It Li ACPI_LV_TABLES 555.It Li ACPI_LV_VALUES 556.It Li ACPI_LV_OBJECTS 557.It Li ACPI_LV_RESOURCES 558.It Li ACPI_LV_USER_REQUESTS 559.It Li ACPI_LV_PACKAGE 560.It Li ACPI_LV_EVALUATION 561.It Li ACPI_LV_VERBOSITY1 562All the previous levels 563.It Li ACPI_LV_ALLOCATIONS 564.It Li ACPI_LV_FUNCTIONS 565.It Li ACPI_LV_OPTIMIZATIONS 566.It Li ACPI_LV_VERBOSITY2 567All the previous levels 568.It Li ACPI_LV_ALL 569Alias for 570.Qq Li ACPI_LV_VERBOSITY2 571.It Li ACPI_LV_MUTEX 572.It Li ACPI_LV_THREADS 573.It Li ACPI_LV_IO 574.It Li ACPI_LV_INTERRUPTS 575.It Li ACPI_LV_VERBOSITY3 576All the previous levels 577.It Li ACPI_LV_AML_DISASSEMBLE 578.It Li ACPI_LV_VERBOSE_INFO 579.It Li ACPI_LV_FULL_TABLES 580.It Li ACPI_LV_EVENTS 581.It Li ACPI_LV_VERBOSE 582All levels after 583.Qq Li ACPI_LV_VERBOSITY3 584.It Li ACPI_LV_INIT_NAMES 585Needs to be specified separately 586.It Li ACPI_LV_LOAD 587Needs to be specified separately 588.El 589.Pp 590Selection of the appropriate layer and level values is important 591to avoid massive amounts of debugging output. 592For example, the following configuration is a good way to gather initial 593information. 594It enables debug output for both ACPICA and the 595.Nm 596driver, printing basic information about errors, warnings, and progress. 597.Bd -literal -offset indent 598debug.acpi.layer="ACPI_ALL_COMPONENTS ACPI_ALL_DRIVERS" 599debug.acpi.level="ACPI_LV_ALL_EXCEPTIONS" 600.Ed 601.Pp 602Debugging output by the ACPICA subsystem is prefixed with the 603module name in lowercase, followed by a source line number. 604Output from the 605.Dx Ns -local 606code follows the same format, but 607the module name is uppercased. 608.Sh OVERRIDING YOUR BIOS BYTECODE 609ACPI interprets bytecode named AML 610(ACPI Machine Language) 611provided by the BIOS vendor as a memory image at boot time. 612Sometimes, the AML code contains a bug that does not appear when parsed 613by the Microsoft implementation. 614.Dx 615provides a way to override it with your own AML code to work around 616or debug such problems. 617Note that all AML in your DSDT and any SSDT tables is overridden. 618.Pp 619In order to load your AML code, copy it to 620.Pa /boot/kernel/acpi_dsdt.aml 621and add the following line to 622.Pa /boot/loader.conf . 623.Bd -literal -offset indent 624acpi_dsdt_load="YES" 625.Ed 626.Pp 627In order to prepare your AML code, you will need the 628.Xr acpidump 8 629and 630.Xr iasl 8 631utilities and some ACPI knowledge. 632.Sh SEE ALSO 633.Xr kenv 1 , 634.Xr acpi_asus 4 , 635.Xr acpi_dock 4 , 636.Xr acpi_fujitsu 4 , 637.Xr acpi_hp 4 , 638.Xr acpi_panasonic 4 , 639.Xr acpi_sony 4 , 640.Xr acpi_thermal 4 , 641.Xr acpi_thinkpad 4 , 642.Xr acpi_toshiba 4 , 643.Xr acpi_video 4 , 644.Xr aibs 4 , 645.Xr loader.conf 5 , 646.Xr acpibin 8 , 647.Xr acpicall 8 , 648.Xr acpiconf 8 , 649.Xr acpidump 8 , 650.Xr acpiexec 8 , 651.Xr acpixtract 8 , 652.Xr iasl 8 653.Rs 654.%A "Hewlett-Packard Corporation" 655.%A "Intel Corporation" 656.%A "Microsoft Corporation" 657.%A "Phoenix Technologies Ltd." 658.%A "Toshiba Corporation" 659.%D November 13, 2013 660.%T "Advanced Configuration and Power Interface Specification" 661.%U http://acpi.info/spec.htm 662.Re 663.Sh AUTHORS 664.An -nosplit 665The ACPICA subsystem is developed and maintained by 666Intel Architecture Labs. 667.Pp 668The following people made notable contributions to the ACPI subsystem 669in 670.Dx : 671.An Michael Smith , 672.An Takanori Watanabe Aq Mt takawata@jp.FreeBSD.org , 673.An Mitsuru IWASAKI Aq Mt iwasaki@jp.FreeBSD.org , 674.An Munehiro Matsuda , 675.An Nate Lawson , 676the ACPI-jp mailing list at 677.Aq Mt acpi-jp@jp.FreeBSD.org , 678and many other contributors. 679.Pp 680This manual page was written by 681.An Michael Smith Aq Mt msmith@FreeBSD.org . 682.Sh BUGS 683Many BIOS versions have serious bugs that may cause system instability, 684break suspend/resume, or prevent devices from operating properly due to 685IRQ routing problems. 686Upgrade your BIOS to the latest version available from the vendor before 687deciding it is a problem with 688.Nm . 689.\".Pp 690.\"The 691.\".Nm 692.\"CPU idle power management drive conflicts with the local APIC (LAPIC) 693.\"timer. 694.\"Disable APIC mode with 695.\".Va hint.apic.0.disabled 696.\"or do not use the 697.\".Li C2 698.\"and 699.\".Li C3 700.\"states if APIC mode is enabled. 701