aboutsummaryrefslogtreecommitdiffstats
path: root/Documentation/kernel-parameters.txt
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt45
1 files changed, 26 insertions, 19 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 136f02842de..f3a89fac220 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -150,16 +150,20 @@ and is between 256 and 4096 characters. It is defined in the file
150 default: 0 150 default: 0
151 151
152 acpi_sleep= [HW,ACPI] Sleep options 152 acpi_sleep= [HW,ACPI] Sleep options
153 Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig, old_ordering } 153 Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig,
154 See Documentation/power/video.txt for s3_bios and s3_mode. 154 old_ordering, s4_nonvs }
155 See Documentation/power/video.txt for information on
156 s3_bios and s3_mode.
155 s3_beep is for debugging; it makes the PC's speaker beep 157 s3_beep is for debugging; it makes the PC's speaker beep
156 as soon as the kernel's real-mode entry point is called. 158 as soon as the kernel's real-mode entry point is called.
157 s4_nohwsig prevents ACPI hardware signature from being 159 s4_nohwsig prevents ACPI hardware signature from being
158 used during resume from hibernation. 160 used during resume from hibernation.
159 old_ordering causes the ACPI 1.0 ordering of the _PTS 161 old_ordering causes the ACPI 1.0 ordering of the _PTS
160 control method, wrt putting devices into low power 162 control method, with respect to putting devices into
161 states, to be enforced (the ACPI 2.0 ordering of _PTS is 163 low power states, to be enforced (the ACPI 2.0 ordering
162 used by default). 164 of _PTS is used by default).
165 s4_nonvs prevents the kernel from saving/restoring the
166 ACPI NVS memory during hibernation.
163 167
164 acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode 168 acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode
165 Format: { level | edge | high | low } 169 Format: { level | edge | high | low }
@@ -194,7 +198,7 @@ and is between 256 and 4096 characters. It is defined in the file
194 acpi_skip_timer_override [HW,ACPI] 198 acpi_skip_timer_override [HW,ACPI]
195 Recognize and ignore IRQ0/pin2 Interrupt Override. 199 Recognize and ignore IRQ0/pin2 Interrupt Override.
196 For broken nForce2 BIOS resulting in XT-PIC timer. 200 For broken nForce2 BIOS resulting in XT-PIC timer.
197 acpi_use_timer_override [HW,ACPI} 201 acpi_use_timer_override [HW,ACPI]
198 Use timer override. For some broken Nvidia NF5 boards 202 Use timer override. For some broken Nvidia NF5 boards
199 that require a timer override, but don't have 203 that require a timer override, but don't have
200 HPET 204 HPET
@@ -861,17 +865,19 @@ and is between 256 and 4096 characters. It is defined in the file
861 See Documentation/ide/ide.txt. 865 See Documentation/ide/ide.txt.
862 866
863 idle= [X86] 867 idle= [X86]
864 Format: idle=poll or idle=mwait, idle=halt, idle=nomwait 868 Format: idle=poll, idle=mwait, idle=halt, idle=nomwait
865 Poll forces a polling idle loop that can slightly improves the performance 869 Poll forces a polling idle loop that can slightly
866 of waking up a idle CPU, but will use a lot of power and make the system 870 improve the performance of waking up a idle CPU, but
867 run hot. Not recommended. 871 will use a lot of power and make the system run hot.
868 idle=mwait. On systems which support MONITOR/MWAIT but the kernel chose 872 Not recommended.
869 to not use it because it doesn't save as much power as a normal idle 873 idle=mwait: On systems which support MONITOR/MWAIT but
870 loop use the MONITOR/MWAIT idle loop anyways. Performance should be the same 874 the kernel chose to not use it because it doesn't save
871 as idle=poll. 875 as much power as a normal idle loop, use the
872 idle=halt. Halt is forced to be used for CPU idle. 876 MONITOR/MWAIT idle loop anyways. Performance should be
877 the same as idle=poll.
878 idle=halt: Halt is forced to be used for CPU idle.
873 In such case C2/C3 won't be used again. 879 In such case C2/C3 won't be used again.
874 idle=nomwait. Disable mwait for CPU C-states 880 idle=nomwait: Disable mwait for CPU C-states
875 881
876 ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem 882 ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem
877 Claim all unknown PCI IDE storage controllers. 883 Claim all unknown PCI IDE storage controllers.
@@ -1053,8 +1059,8 @@ and is between 256 and 4096 characters. It is defined in the file
1053 lapic [X86-32,APIC] Enable the local APIC even if BIOS 1059 lapic [X86-32,APIC] Enable the local APIC even if BIOS
1054 disabled it. 1060 disabled it.
1055 1061
1056 lapic_timer_c2_ok [X86-32,x86-64,APIC] trust the local apic timer in 1062 lapic_timer_c2_ok [X86-32,x86-64,APIC] trust the local apic timer
1057 C2 power state. 1063 in C2 power state.
1058 1064
1059 libata.dma= [LIBATA] DMA control 1065 libata.dma= [LIBATA] DMA control
1060 libata.dma=0 Disable all PATA and SATA DMA 1066 libata.dma=0 Disable all PATA and SATA DMA
@@ -2242,7 +2248,8 @@ and is between 256 and 4096 characters. It is defined in the file
2242 2248
2243 thermal.psv= [HW,ACPI] 2249 thermal.psv= [HW,ACPI]
2244 -1: disable all passive trip points 2250 -1: disable all passive trip points
2245 <degrees C>: override all passive trip points to this value 2251 <degrees C>: override all passive trip points to this
2252 value
2246 2253
2247 thermal.tzp= [HW,ACPI] 2254 thermal.tzp= [HW,ACPI]
2248 Specify global default ACPI thermal zone polling rate 2255 Specify global default ACPI thermal zone polling rate