kernel-parameters.txt (d67297ad343ec02a88f947b45526c92d2870aed3) kernel-parameters.txt (99c8b231ae6c6ca4ca2fd1c0b3701071f589661f)
1 acpi= [HW,ACPI,X86,ARM64]
2 Advanced Configuration and Power Interface
3 Format: { force | on | off | strict | noirq | rsdt |
4 copy_dsdt }
5 force -- enable ACPI if default was off
6 on -- enable ACPI but allow fallback to DT [arm64]
7 off -- disable ACPI if default was on
8 noirq -- do not use ACPI for IRQ routing

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48 CONFIG_ACPI_DEBUG must be enabled to produce any ACPI
49 debug output. Bits in debug_layer correspond to a
50 _COMPONENT in an ACPI source file, e.g.,
51 #define _COMPONENT ACPI_PCI_COMPONENT
52 Bits in debug_level correspond to a level in
53 ACPI_DEBUG_PRINT statements, e.g.,
54 ACPI_DEBUG_PRINT((ACPI_DB_INFO, ...
55 The debug_level mask defaults to "info". See
1 acpi= [HW,ACPI,X86,ARM64]
2 Advanced Configuration and Power Interface
3 Format: { force | on | off | strict | noirq | rsdt |
4 copy_dsdt }
5 force -- enable ACPI if default was off
6 on -- enable ACPI but allow fallback to DT [arm64]
7 off -- disable ACPI if default was on
8 noirq -- do not use ACPI for IRQ routing

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48 CONFIG_ACPI_DEBUG must be enabled to produce any ACPI
49 debug output. Bits in debug_layer correspond to a
50 _COMPONENT in an ACPI source file, e.g.,
51 #define _COMPONENT ACPI_PCI_COMPONENT
52 Bits in debug_level correspond to a level in
53 ACPI_DEBUG_PRINT statements, e.g.,
54 ACPI_DEBUG_PRINT((ACPI_DB_INFO, ...
55 The debug_level mask defaults to "info". See
56 Documentation/firmware-guide/acpi/debug.rst for more information about
56 Documentation/acpi/debug.txt for more information about
57 debug layers and levels.
58
59 Enable processor driver info messages:
60 acpi.debug_layer=0x20000000
61 Enable PCI/PCI interrupt routing info messages:
62 acpi.debug_layer=0x400000
63 Enable AML "Debug" output, i.e., stores to the Debug
64 object while interpreting AML:

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703 [KNL] Using kexec, Linux can switch to a 'crash kernel'
704 upon panic. This parameter reserves the physical
705 memory region [offset, offset + size] for that kernel
706 image. If '@offset' is omitted, then a suitable offset
707 is selected automatically.
708 [KNL, x86_64] select a region under 4G first, and
709 fall back to reserve region above 4G when '@offset'
710 hasn't been specified.
57 debug layers and levels.
58
59 Enable processor driver info messages:
60 acpi.debug_layer=0x20000000
61 Enable PCI/PCI interrupt routing info messages:
62 acpi.debug_layer=0x400000
63 Enable AML "Debug" output, i.e., stores to the Debug
64 object while interpreting AML:

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703 [KNL] Using kexec, Linux can switch to a 'crash kernel'
704 upon panic. This parameter reserves the physical
705 memory region [offset, offset + size] for that kernel
706 image. If '@offset' is omitted, then a suitable offset
707 is selected automatically.
708 [KNL, x86_64] select a region under 4G first, and
709 fall back to reserve region above 4G when '@offset'
710 hasn't been specified.
711 See Documentation/kdump/kdump.rst for further details.
711 See Documentation/kdump/kdump.txt for further details.
712
713 crashkernel=range1:size1[,range2:size2,...][@offset]
714 [KNL] Same as above, but depends on the memory
715 in the running system. The syntax of range is
716 start-[end] where start and end are both
717 a memory unit (amount[KMG]). See also
712
713 crashkernel=range1:size1[,range2:size2,...][@offset]
714 [KNL] Same as above, but depends on the memory
715 in the running system. The syntax of range is
716 start-[end] where start and end are both
717 a memory unit (amount[KMG]). See also
718 Documentation/kdump/kdump.rst for an example.
718 Documentation/kdump/kdump.txt for an example.
719
720 crashkernel=size[KMG],high
721 [KNL, x86_64] range could be above 4G. Allow kernel
722 to allocate physical memory region from top, so could
723 be above 4G if system have more than 4G ram installed.
724 Otherwise memory region will be allocated below 4G, if
725 available.
726 It will be ignored if crashkernel=X is specified.

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958
959 dyndbg[="val"] [KNL,DYNAMIC_DEBUG]
960 module.dyndbg[="val"]
961 Enable debug messages at boot time. See
962 Documentation/admin-guide/dynamic-debug-howto.rst
963 for details.
964
965 nompx [X86] Disables Intel Memory Protection Extensions.
719
720 crashkernel=size[KMG],high
721 [KNL, x86_64] range could be above 4G. Allow kernel
722 to allocate physical memory region from top, so could
723 be above 4G if system have more than 4G ram installed.
724 Otherwise memory region will be allocated below 4G, if
725 available.
726 It will be ignored if crashkernel=X is specified.

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958
959 dyndbg[="val"] [KNL,DYNAMIC_DEBUG]
960 module.dyndbg[="val"]
961 Enable debug messages at boot time. See
962 Documentation/admin-guide/dynamic-debug-howto.rst
963 for details.
964
965 nompx [X86] Disables Intel Memory Protection Extensions.
966 See Documentation/x86/intel_mpx.rst for more
966 See Documentation/x86/intel_mpx.txt for more
967 information about the feature.
968
969 nopku [X86] Disable Memory Protection Keys CPU feature found
970 in some Intel CPUs.
971
972 module.async_probe [KNL]
973 Enable asynchronous probe on this module.
974

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1184 related feature. For example, you can do debugging of
1185 Address Range Mirroring feature even if your box
1186 doesn't support it.
1187
1188 efivar_ssdt= [EFI; X86] Name of an EFI variable that contains an SSDT
1189 that is to be dynamically loaded by Linux. If there are
1190 multiple variables with the same name but with different
1191 vendor GUIDs, all of them will be loaded. See
967 information about the feature.
968
969 nopku [X86] Disable Memory Protection Keys CPU feature found
970 in some Intel CPUs.
971
972 module.async_probe [KNL]
973 Enable asynchronous probe on this module.
974

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1184 related feature. For example, you can do debugging of
1185 Address Range Mirroring feature even if your box
1186 doesn't support it.
1187
1188 efivar_ssdt= [EFI; X86] Name of an EFI variable that contains an SSDT
1189 that is to be dynamically loaded by Linux. If there are
1190 multiple variables with the same name but with different
1191 vendor GUIDs, all of them will be loaded. See
1192 Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1192 Documentation/acpi/ssdt-overlays.txt for details.
1193
1194
1195 eisa_irq_edge= [PARISC,HW]
1196 See header of drivers/parisc/eisa.c.
1197
1198 elanfreq= [X86-32]
1199 See comment before function elanfreq_setup() in
1200 arch/x86/kernel/cpu/cpufreq/elanfreq.c.
1201
1202 elevator= [IOSCHED]
1203 Format: { "mq-deadline" | "kyber" | "bfq" }
1204 See Documentation/block/deadline-iosched.txt,
1205 Documentation/block/kyber-iosched.txt and
1206 Documentation/block/bfq-iosched.txt for details.
1207
1208 elfcorehdr=[size[KMG]@]offset[KMG] [IA64,PPC,SH,X86,S390]
1209 Specifies physical address of start of kernel core
1210 image elf header and optionally the size. Generally
1211 kexec loader will pass this option to capture kernel.
1193
1194
1195 eisa_irq_edge= [PARISC,HW]
1196 See header of drivers/parisc/eisa.c.
1197
1198 elanfreq= [X86-32]
1199 See comment before function elanfreq_setup() in
1200 arch/x86/kernel/cpu/cpufreq/elanfreq.c.
1201
1202 elevator= [IOSCHED]
1203 Format: { "mq-deadline" | "kyber" | "bfq" }
1204 See Documentation/block/deadline-iosched.txt,
1205 Documentation/block/kyber-iosched.txt and
1206 Documentation/block/bfq-iosched.txt for details.
1207
1208 elfcorehdr=[size[KMG]@]offset[KMG] [IA64,PPC,SH,X86,S390]
1209 Specifies physical address of start of kernel core
1210 image elf header and optionally the size. Generally
1211 kexec loader will pass this option to capture kernel.
1212 See Documentation/kdump/kdump.rst for details.
1212 See Documentation/kdump/kdump.txt for details.
1213
1214 enable_mtrr_cleanup [X86]
1215 The kernel tries to adjust MTRR layout from continuous
1216 to discrete, to make X server driver able to add WB
1217 entry later. This parameter enables that.
1218
1219 enable_timer_pin_1 [X86]
1220 Enable PIN 1 of APIC timer

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1383 size of <nn>. This works even on boxes that have no
1384 highmem otherwise. This also works to reduce highmem
1385 size on bigger boxes.
1386
1387 highres= [KNL] Enable/disable high resolution timer mode.
1388 Valid parameters: "on", "off"
1389 Default: "on"
1390
1213
1214 enable_mtrr_cleanup [X86]
1215 The kernel tries to adjust MTRR layout from continuous
1216 to discrete, to make X server driver able to add WB
1217 entry later. This parameter enables that.
1218
1219 enable_timer_pin_1 [X86]
1220 Enable PIN 1 of APIC timer

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1383 size of <nn>. This works even on boxes that have no
1384 highmem otherwise. This also works to reduce highmem
1385 size on bigger boxes.
1386
1387 highres= [KNL] Enable/disable high resolution timer mode.
1388 Valid parameters: "on", "off"
1389 Default: "on"
1390
1391 hisax= [HW,ISDN]
1392 See Documentation/isdn/README.HiSax.
1393
1391 hlt [BUGS=ARM,SH]
1392
1393 hpet= [X86-32,HPET] option to control HPET usage
1394 Format: { enable (default) | disable | force |
1395 verbose }
1396 disable: disable HPET and use PIT instead
1397 force: allow force enabled of undocumented chips (ICH4,
1398 VIA, nVidia)

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1499
1500 icn= [HW,ISDN]
1501 Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]]
1502
1503 ide-core.nodma= [HW] (E)IDE subsystem
1504 Format: =0.0 to prevent dma on hda, =0.1 hdb =1.0 hdc
1505 .vlb_clock .pci_clock .noflush .nohpa .noprobe .nowerr
1506 .cdrom .chs .ignore_cable are additional options
1394 hlt [BUGS=ARM,SH]
1395
1396 hpet= [X86-32,HPET] option to control HPET usage
1397 Format: { enable (default) | disable | force |
1398 verbose }
1399 disable: disable HPET and use PIT instead
1400 force: allow force enabled of undocumented chips (ICH4,
1401 VIA, nVidia)

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1502
1503 icn= [HW,ISDN]
1504 Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]]
1505
1506 ide-core.nodma= [HW] (E)IDE subsystem
1507 Format: =0.0 to prevent dma on hda, =0.1 hdb =1.0 hdc
1508 .vlb_clock .pci_clock .noflush .nohpa .noprobe .nowerr
1509 .cdrom .chs .ignore_cable are additional options
1507 See Documentation/ide/ide.rst.
1510 See Documentation/ide/ide.txt.
1508
1509 ide-generic.probe-mask= [HW] (E)IDE subsystem
1510 Format: <int>
1511 Probe mask for legacy ISA IDE ports. Depending on
1512 platform up to 6 ports are supported, enabled by
1513 setting corresponding bits in the mask to 1. The
1514 default value is 0x0, which has a special meaning.
1515 On systems that have PCI, it triggers scanning the

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2375 (loop.max_loop) unconditionally pre-created at init time. The default
2376 number is configured by BLK_DEV_LOOP_MIN_COUNT. Instead
2377 of statically allocating a predefined number, loop
2378 devices can be requested on-demand with the
2379 /dev/loop-control interface.
2380
2381 mce [X86-32] Machine Check Exception
2382
1511
1512 ide-generic.probe-mask= [HW] (E)IDE subsystem
1513 Format: <int>
1514 Probe mask for legacy ISA IDE ports. Depending on
1515 platform up to 6 ports are supported, enabled by
1516 setting corresponding bits in the mask to 1. The
1517 default value is 0x0, which has a special meaning.
1518 On systems that have PCI, it triggers scanning the

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2378 (loop.max_loop) unconditionally pre-created at init time. The default
2379 number is configured by BLK_DEV_LOOP_MIN_COUNT. Instead
2380 of statically allocating a predefined number, loop
2381 devices can be requested on-demand with the
2382 /dev/loop-control interface.
2383
2384 mce [X86-32] Machine Check Exception
2385
2383 mce=option [X86-64] See Documentation/x86/x86_64/boot-options.rst
2386 mce=option [X86-64] See Documentation/x86/x86_64/boot-options.txt
2384
2385 md= [HW] RAID subsystems devices and level
2386 See Documentation/admin-guide/md.rst.
2387
2388 mdacon= [MDA]
2389 Format: <first>,<last>
2390 Specifies range of consoles to be captured by the MDA.
2391

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2431 per-device physically contiguous DMA buffers.
2432
2433 memhp_default_state=online/offline
2434 [KNL] Set the initial state for the memory hotplug
2435 onlining policy. If not specified, the default value is
2436 set according to the
2437 CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE kernel config
2438 option.
2387
2388 md= [HW] RAID subsystems devices and level
2389 See Documentation/admin-guide/md.rst.
2390
2391 mdacon= [MDA]
2392 Format: <first>,<last>
2393 Specifies range of consoles to be captured by the MDA.
2394

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2434 per-device physically contiguous DMA buffers.
2435
2436 memhp_default_state=online/offline
2437 [KNL] Set the initial state for the memory hotplug
2438 onlining policy. If not specified, the default value is
2439 set according to the
2440 CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE kernel config
2441 option.
2439 See Documentation/admin-guide/mm/memory-hotplug.rst.
2442 See Documentation/memory-hotplug.txt.
2440
2441 memmap=exactmap [KNL,X86] Enable setting of an exact
2442 E820 memory map, as specified by the user.
2443 Such memmap=exactmap lines can be constructed based on
2444 BIOS output or other requirements. See the memmap=nn@ss
2445 option description.
2446
2447 memmap=nn[KMG]@ss[KMG]

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2520 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
2521 Valid arguments: on, off
2522 Default (depends on kernel configuration option):
2523 on (CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=y)
2524 off (CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=n)
2525 mem_encrypt=on: Activate SME
2526 mem_encrypt=off: Do not activate SME
2527
2443
2444 memmap=exactmap [KNL,X86] Enable setting of an exact
2445 E820 memory map, as specified by the user.
2446 Such memmap=exactmap lines can be constructed based on
2447 BIOS output or other requirements. See the memmap=nn@ss
2448 option description.
2449
2450 memmap=nn[KMG]@ss[KMG]

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2523 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
2524 Valid arguments: on, off
2525 Default (depends on kernel configuration option):
2526 on (CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=y)
2527 off (CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=n)
2528 mem_encrypt=on: Activate SME
2529 mem_encrypt=off: Do not activate SME
2530
2528 Refer to Documentation/virtual/kvm/amd-memory-encryption.rst
2531 Refer to Documentation/x86/amd-memory-encryption.txt
2529 for details on when memory encryption can be activated.
2530
2531 mem_sleep_default= [SUSPEND] Default system suspend mode:
2532 s2idle - Suspend-To-Idle
2533 shallow - Power-On Suspend or equivalent (if supported)
2534 deep - Suspend-To-RAM or equivalent (if supported)
2535 See Documentation/admin-guide/pm/sleep-states.rst.
2536

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2828 Format: [state][,regs][,debounce][,die]
2829
2830 nmi_watchdog= [KNL,BUGS=X86] Debugging features for SMP kernels
2831 Format: [panic,][nopanic,][num]
2832 Valid num: 0 or 1
2833 0 - turn hardlockup detector in nmi_watchdog off
2834 1 - turn hardlockup detector in nmi_watchdog on
2835 When panic is specified, panic when an NMI watchdog
2532 for details on when memory encryption can be activated.
2533
2534 mem_sleep_default= [SUSPEND] Default system suspend mode:
2535 s2idle - Suspend-To-Idle
2536 shallow - Power-On Suspend or equivalent (if supported)
2537 deep - Suspend-To-RAM or equivalent (if supported)
2538 See Documentation/admin-guide/pm/sleep-states.rst.
2539

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2831 Format: [state][,regs][,debounce][,die]
2832
2833 nmi_watchdog= [KNL,BUGS=X86] Debugging features for SMP kernels
2834 Format: [panic,][nopanic,][num]
2835 Valid num: 0 or 1
2836 0 - turn hardlockup detector in nmi_watchdog off
2837 1 - turn hardlockup detector in nmi_watchdog on
2838 When panic is specified, panic when an NMI watchdog
2836 timeout occurs (or 'nopanic' to not panic on an NMI
2837 watchdog, if CONFIG_BOOTPARAM_HARDLOCKUP_PANIC is set)
2838 To disable both hard and soft lockup detectors,
2839 timeout occurs (or 'nopanic' to override the opposite
2840 default). To disable both hard and soft lockup detectors,
2839 please see 'nowatchdog'.
2840 This is useful when you use a panic=... timeout and
2841 need the box quickly up again.
2842
2843 These settings can be accessed at runtime via
2844 the nmi_watchdog and hardlockup_panic sysctls.
2845
2846 netpoll.carrier_timeout=

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3521
3522 pf. [PARIDE]
3523 See Documentation/blockdev/paride.txt.
3524
3525 pg. [PARIDE]
3526 See Documentation/blockdev/paride.txt.
3527
3528 pirq= [SMP,APIC] Manual mp-table setup
2841 please see 'nowatchdog'.
2842 This is useful when you use a panic=... timeout and
2843 need the box quickly up again.
2844
2845 These settings can be accessed at runtime via
2846 the nmi_watchdog and hardlockup_panic sysctls.
2847
2848 netpoll.carrier_timeout=

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3523
3524 pf. [PARIDE]
3525 See Documentation/blockdev/paride.txt.
3526
3527 pg. [PARIDE]
3528 See Documentation/blockdev/paride.txt.
3529
3530 pirq= [SMP,APIC] Manual mp-table setup
3529 See Documentation/x86/i386/IO-APIC.rst.
3531 See Documentation/x86/i386/IO-APIC.txt.
3530
3531 plip= [PPT,NET] Parallel port network link
3532 Format: { parport<nr> | timid | 0 }
3533 See also Documentation/admin-guide/parport.rst.
3534
3535 pmtmr= [X86] Manual setup of pmtmr I/O Port.
3536 Override pmtimer IOPort with a hex value.
3537 e.g. pmtmr=0x508

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4071 reboot only),
4072 reboot_type is one of bios, acpi, kbd, triple, efi, or pci,
4073 reboot_force is either force or not specified,
4074 reboot_cpu is s[mp]#### with #### being the processor
4075 to be used for rebooting.
4076
4077 relax_domain_level=
4078 [KNL, SMP] Set scheduler's default relax_domain_level.
3532
3533 plip= [PPT,NET] Parallel port network link
3534 Format: { parport<nr> | timid | 0 }
3535 See also Documentation/admin-guide/parport.rst.
3536
3537 pmtmr= [X86] Manual setup of pmtmr I/O Port.
3538 Override pmtimer IOPort with a hex value.
3539 e.g. pmtmr=0x508

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4073 reboot only),
4074 reboot_type is one of bios, acpi, kbd, triple, efi, or pci,
4075 reboot_force is either force or not specified,
4076 reboot_cpu is s[mp]#### with #### being the processor
4077 to be used for rebooting.
4078
4079 relax_domain_level=
4080 [KNL, SMP] Set scheduler's default relax_domain_level.
4079 See Documentation/cgroup-v1/cpusets.txt.
4081 See Documentation/cgroup-v1/cpusets.rst.
4080
4081 reserve= [KNL,BUGS] Force kernel to ignore I/O ports or memory
4082 Format: <base1>,<size1>[,<base2>,<size2>,...]
4083 Reserve I/O ports or memory so the kernel won't use
4084 them. If <base> is less than 0x10000, the region
4085 is assumed to be I/O ports; otherwise it is memory.
4086
4087 reservetop= [X86-32]

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4581 Sets the number of seconds to remain in a suspend test
4582 mode before resuming the system (see
4583 /sys/power/pm_test). Only available when CONFIG_PM_DEBUG
4584 is set. Default value is 5.
4585
4586 swapaccount=[0|1]
4587 [KNL] Enable accounting of swap in memory resource
4588 controller if no parameter or 1 is given or disable
4082
4083 reserve= [KNL,BUGS] Force kernel to ignore I/O ports or memory
4084 Format: <base1>,<size1>[,<base2>,<size2>,...]
4085 Reserve I/O ports or memory so the kernel won't use
4086 them. If <base> is less than 0x10000, the region
4087 is assumed to be I/O ports; otherwise it is memory.
4088
4089 reservetop= [X86-32]

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4583 Sets the number of seconds to remain in a suspend test
4584 mode before resuming the system (see
4585 /sys/power/pm_test). Only available when CONFIG_PM_DEBUG
4586 is set. Default value is 5.
4587
4588 swapaccount=[0|1]
4589 [KNL] Enable accounting of swap in memory resource
4590 controller if no parameter or 1 is given or disable
4589 it if 0 is given (See Documentation/cgroup-v1/memory.txt)
4591 it if 0 is given (See Documentation/cgroup-v1/memory.rst)
4590
4591 swiotlb= [ARM,IA-64,PPC,MIPS,X86]
4592 Format: { <int> | force | noforce }
4593 <int> -- Number of I/O TLB slabs
4594 force -- force using of bounce buffers even if they
4595 wouldn't be automatically used by the kernel
4596 noforce -- Never use bounce buffers (for debugging)
4597

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5019
5020 Try vdso32=0 if you encounter an error that says:
5021 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
5022
5023 vector= [IA-64,SMP]
5024 vector=percpu: enable percpu vector domain
5025
5026 video= [FB] Frame buffer configuration
4592
4593 swiotlb= [ARM,IA-64,PPC,MIPS,X86]
4594 Format: { <int> | force | noforce }
4595 <int> -- Number of I/O TLB slabs
4596 force -- force using of bounce buffers even if they
4597 wouldn't be automatically used by the kernel
4598 noforce -- Never use bounce buffers (for debugging)
4599

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5021
5022 Try vdso32=0 if you encounter an error that says:
5023 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
5024
5025 vector= [IA-64,SMP]
5026 vector=percpu: enable percpu vector domain
5027
5028 video= [FB] Frame buffer configuration
5027 See Documentation/fb/modedb.rst.
5029 See Documentation/fb/modedb.txt.
5028
5029 video.brightness_switch_enabled= [0,1]
5030 If set to 1, on receiving an ACPI notify event
5031 generated by hotkey, video driver will adjust brightness
5032 level and then send out the event to user space through
5033 the allocated input device; If set to 0, video driver
5034 will only send out the event without touching backlight
5035 brightness level.

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5047 request_irq())
5048 <id> := (optional) platform device id
5049 example:
5050 virtio_mmio.device=1K@0x100b0000:48:7
5051
5052 Can be used multiple times for multiple devices.
5053
5054 vga= [BOOT,X86-32] Select a particular video mode
5030
5031 video.brightness_switch_enabled= [0,1]
5032 If set to 1, on receiving an ACPI notify event
5033 generated by hotkey, video driver will adjust brightness
5034 level and then send out the event to user space through
5035 the allocated input device; If set to 0, video driver
5036 will only send out the event without touching backlight
5037 brightness level.

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5049 request_irq())
5050 <id> := (optional) platform device id
5051 example:
5052 virtio_mmio.device=1K@0x100b0000:48:7
5053
5054 Can be used multiple times for multiple devices.
5055
5056 vga= [BOOT,X86-32] Select a particular video mode
5055 See Documentation/x86/boot.rst and
5057 See Documentation/x86/boot.txt and
5056 Documentation/svga.txt.
5057 Use vga=ask for menu.
5058 This is actually a boot loader parameter; the value is
5059 passed to the kernel using a special protocol.
5060
5061 vm_debug[=options] [KNL] Available with CONFIG_DEBUG_VM=y.
5062 May slow down system boot speed, especially when
5063 enabled on systems with a large amount of memory.

--- 213 unchanged lines hidden --- 		5058 Documentation/svga.txt.
5059 Use vga=ask for menu.
5060 This is actually a boot loader parameter; the value is
5061 passed to the kernel using a special protocol.
5062
5063 vm_debug[=options] [KNL] Available with CONFIG_DEBUG_VM=y.
5064 May slow down system boot speed, especially when
5065 enabled on systems with a large amount of memory.

--- 213 unchanged lines hidden ---