How to make ACPI work - Revision history

WilliamPoetra: /* Screen blanking (Standby) */

2015-10-28T01:24:19Z

‎Screen blanking (Standby)

2012-12-14T21:52:10Z

‎Machine reboots after shutting down

2012-12-14T21:50:06Z

‎Machine reboots after shutting down

2011-10-20T18:00:44Z

‎Suspend to disk (Hibernate)

2010-06-06T08:36:46Z

‎Backlight problems with post-2.6.26 kernels

2009-08-10T18:20:26Z

2009-05-20T05:49:46Z

ACPI S4 hardware signature mismatch

2008-11-26T06:24:59Z

‎Backlight problems with post-2.6.26 kernels

2008-11-25T02:57:18Z

‎ACPI daemon: Added note concerning acpid's impending obsolescence.

2008-11-25T00:04:26Z

‎Suspend to disk (Hibernate)

← Older revision		Revision as of 01:24, 28 October 2015
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	Note that this may not work in combination with {{cmduser\|echo -n "mem" > /sys/power/state}} because switching to console causes the backlight to come back on before sleeping.		Note that this may not work in combination with {{cmduser\|echo -n "mem" > /sys/power/state}} because switching to console causes the backlight to come back on before sleeping.
		+
		+	See also [[How to reduce power consumption#LCD Backlight/Brightness]]

	==Suspend to RAM (Sleep)==		==Suspend to RAM (Sleep)==

@@ Line 117: / Line 117: @@
   rmmod ehci_hcd
-Needed on {{X220}} and {{X230}}.
+Needed on {{X220}} and {{X230|Reboots after shutting down}}.
 ==ThinkPads on which it is recommended to use ACPI==

← Older revision		Revision as of 21:50, 14 December 2012
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	rmmod ehci_hcd		rmmod ehci_hcd
		+
		+	Needed on {{X220}} and {{X230}}.

	==ThinkPads on which it is recommended to use ACPI==		==ThinkPads on which it is recommended to use ACPI==

← Older revision		Revision as of 18:00, 20 October 2011
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	See the according drivers page for instructions.		See the according drivers page for instructions.
		+
		+	== Troubleshooting ==
		+
		+	=== Machine reboots after shutting down ===
		+
		+	Try removing ehci_hcd before shutting down, eg, add the following line to rc.local.shutdown
		+
		+	rmmod ehci_hcd

	==ThinkPads on which it is recommended to use ACPI==		==ThinkPads on which it is recommended to use ACPI==

@@ Line 55: / Line 55: @@
 According to [[http://www.nabble.com/T61-Brightness-keys-with-2.6.26-not-working-(NVIDIA)-td18577619.html this thread]], users with 2.6.26 kernel and higher may experience problems with ThinkPad backlight contols ('''Fn+Home''', '''Fn+End''' on T61). The symptoms are:
 * backlight brightness controls do not work;
-* Using '''acpi-listen''' (''acpi_listen''?) command, there is no reaction for '''brightness down''' button, but '''brightenss up''' gives:
+* Using '''acpi_listen''' command, there is no reaction for '''brightness down''' button, but '''brightenss up''' gives:
    ibm/hotkey HKEY 00000080 00001010

@@ Line 45: / Line 45: @@
 Many ThinkPads have been hit by a recent (kernel 2.6.16) change to ACPI4Linux that changed the default means of accessing the ACPI Embedded Controller as a way to shake out underlying bugs in the EC access code. If your ThinkPad fails to resume properly (a blinking Sleep light on resume that doesn't go away, or a hang when trying to suspend/standby a second time), adding {{bootparm|ec_intr|0}} to your kernel command line may help.
-===IBM specific ACPI driver===
+===ThinkPad specific ACPI driver===
-====Pre-2.6.22====
+If you are using kernel version 2.6.22 and later, please use the [[thinkpad-acpi]] driver included with the kernel.
 {{HINT|Generally it is a good idea to read the README included with the driver.}}

← Older revision		Revision as of 05:49, 20 May 2009
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	{{NOTE\|Without `CONFIG_VIDEO_OUTPUT_CONTROL` enabled, one will not be able to enable `CONFIG_ACPI_VIDEO` in menuconfig or similar interface as the option will remain hidden}}		{{NOTE\|Without `CONFIG_VIDEO_OUTPUT_CONTROL` enabled, one will not be able to enable `CONFIG_ACPI_VIDEO` in menuconfig or similar interface as the option will remain hidden}}
		+
		+	===ACPI S4 hardware signature mismatch===
		+
		+	Around kernel 2.6.27, a feature was introduced to check the hardware signature on resume from S4 (hibernate). This feature might be broken on some models. Resume will halt and the following error message is shown:
		+	:ACPI: Hardware changed while hibernated, cannot resume!
		+	:Kernel panic - not syncing: ACPI S4 hardware signature mismatch
		+	To fix it, add the following kernel parameter:
		+	:acpi_sleep=s4_nohwsig
		+	This problem appeared here on a T42p, but only if the power is unplugged while hibernated, even if the battery is still plugged. Another sympton is, that resume hangs with a dark screen if the acpi_cpufreq module is loaded, even if the power is not unplugged while hibernated. With the above mentioned kernel parameter, both problems go away.

	===ACPI daemon===		===ACPI daemon===

@@ Line 82: / Line 82: @@
 ===ACPI daemon===
 Also you'll need to install [[acpid]], if it isn't present on your system. [[acpid]] is a daemon that handles the ACPI events generated by the system. Read [[How to configure acpid]].
 ==Screen blanking (Standby)==

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 There are two drivers for this available:
 * [[swsusp]], which is in the kernel and
-* [[Software Suspend 2]] which is more feature rich, but not yet in the kernel, so you have to patch it in yourself.
+* [[TuxOnIce]] which is more feature rich, but not yet in the kernel, so you have to patch it in yourself.
 Both are reported to work fine as long as you use open-source graphic drivers. A comparison of the features can be found on [http://softwaresuspend.berlios.de/features.html this page].