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-rw-r--r--Documentation/kernel-parameters.txt32
1 files changed, 27 insertions, 5 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 12533a958c51..e3394eb42cb7 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -181,19 +181,41 @@ and is between 256 and 4096 characters. It is defined in the file
181 that require a timer override, but don't have 181 that require a timer override, but don't have
182 HPET 182 HPET
183 183
184 acpi_dbg_layer= [HW,ACPI] 184 acpi.debug_layer= [HW,ACPI]
185 Format: <int> 185 Format: <int>
186 Each bit of the <int> indicates an ACPI debug layer, 186 Each bit of the <int> indicates an ACPI debug layer,
187 1: enable, 0: disable. It is useful for boot time 187 1: enable, 0: disable. It is useful for boot time
188 debugging. After system has booted up, it can be set 188 debugging. After system has booted up, it can be set
189 via /proc/acpi/debug_layer. 189 via /sys/module/acpi/parameters/debug_layer.
190 190 CONFIG_ACPI_DEBUG must be enabled for this to produce any output.
191 acpi_dbg_level= [HW,ACPI] 191 Available bits (add the numbers together) to enable debug output
192 for specific parts of the ACPI subsystem:
193 0x01 utilities 0x02 hardware 0x04 events 0x08 tables
194 0x10 namespace 0x20 parser 0x40 dispatcher
195 0x80 executer 0x100 resources 0x200 acpica debugger
196 0x400 os services 0x800 acpica disassembler.
197 The number can be in decimal or prefixed with 0x in hex.
198 Warning: Many of these options can produce a lot of
199 output and make your system unusable. Be very careful.
200
201 acpi.debug_level= [HW,ACPI]
192 Format: <int> 202 Format: <int>
193 Each bit of the <int> indicates an ACPI debug level, 203 Each bit of the <int> indicates an ACPI debug level,
194 1: enable, 0: disable. It is useful for boot time 204 1: enable, 0: disable. It is useful for boot time
195 debugging. After system has booted up, it can be set 205 debugging. After system has booted up, it can be set
196 via /proc/acpi/debug_level. 206 via /sys/module/acpi/parameters/debug_level.
207 CONFIG_ACPI_DEBUG must be enabled for this to produce any output.
208 Available bits (add the numbers together) to enable different
209 debug output levels of the ACPI subsystem:
210 0x01 error 0x02 warn 0x04 init 0x08 debug object
211 0x10 info 0x20 init names 0x40 parse 0x80 load
212 0x100 dispatch 0x200 execute 0x400 names 0x800 operation region
213 0x1000 bfield 0x2000 tables 0x4000 values 0x8000 objects
214 0x10000 resources 0x20000 user requests 0x40000 package.
215 The number can be in decimal or prefixed with 0x in hex.
216 Warning: Many of these options can produce a lot of
217 output and make your system unusable. Be very careful.
218
197 219
198 acpi_fake_ecdt [HW,ACPI] Workaround failure due to BIOS lacking ECDT 220 acpi_fake_ecdt [HW,ACPI] Workaround failure due to BIOS lacking ECDT
199 221