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authorLen Brown <len.brown@intel.com>2009-12-16 00:00:54 -0500
committerLen Brown <len.brown@intel.com>2009-12-16 00:00:54 -0500
commit7458bbd044f0e799ad27c3fc71e1115ac30a9c25 (patch)
tree4c9a320613722421f49b53266abcc64f90471f91 /Documentation
parent1667e399a41be976c9d37bf02aa477979df111d2 (diff)
parent5d2eb14d36723eba0b31ae208bc346835751e944 (diff)
Merge branch 'thinkpad-2.6.33' into release
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/laptops/thinkpad-acpi.txt114
1 files changed, 64 insertions, 50 deletions
diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index aafcaa634191..169091f75e6d 100644
--- a/Documentation/laptops/thinkpad-acpi.txt
+++ b/Documentation/laptops/thinkpad-acpi.txt
@@ -1,7 +1,7 @@
ThinkPad ACPI Extras Driver
- Version 0.23
- April 10th, 2009
+ Version 0.24
+ December 11th, 2009
Borislav Deianov <borislav@users.sf.net>
Henrique de Moraes Holschuh <hmh@hmh.eng.br>
@@ -460,6 +460,8 @@ event code Key Notes
For Lenovo ThinkPads with a new
BIOS, it has to be handled either
by the ACPI OSI, or by userspace.
+ The driver does the right thing,
+ never mess with this.
0x1011 0x10 FN+END Brightness down. See brightness
up for details.
@@ -582,46 +584,15 @@ with hotkey_report_mode.
Brightness hotkey notes:
-These are the current sane choices for brightness key mapping in
-thinkpad-acpi:
+Don't mess with the brightness hotkeys in a Thinkpad. If you want
+notifications for OSD, use the sysfs backlight class event support.
-For IBM and Lenovo models *without* ACPI backlight control (the ones on
-which thinkpad-acpi will autoload its backlight interface by default,
-and on which ACPI video does not export a backlight interface):
-
-1. Don't enable or map the brightness hotkeys in thinkpad-acpi, as
- these older firmware versions unfortunately won't respect the hotkey
- mask for brightness keys anyway, and always reacts to them. This
- usually work fine, unless X.org drivers are doing something to block
- the BIOS. In that case, use (3) below. This is the default mode of
- operation.
-
-2. Enable the hotkeys, but map them to something else that is NOT
- KEY_BRIGHTNESS_UP/DOWN or any other keycode that would cause
- userspace to try to change the backlight level, and use that as an
- on-screen-display hint.
-
-3. IF AND ONLY IF X.org drivers find a way to block the firmware from
- automatically changing the brightness, enable the hotkeys and map
- them to KEY_BRIGHTNESS_UP and KEY_BRIGHTNESS_DOWN, and feed that to
- something that calls xbacklight. thinkpad-acpi will not be able to
- change brightness in that case either, so you should disable its
- backlight interface.
-
-For Lenovo models *with* ACPI backlight control:
-
-1. Load up ACPI video and use that. ACPI video will report ACPI
- events for brightness change keys. Do not mess with thinkpad-acpi
- defaults in this case. thinkpad-acpi should not have anything to do
- with backlight events in a scenario where ACPI video is loaded:
- brightness hotkeys must be disabled, and the backlight interface is
- to be kept disabled as well. This is the default mode of operation.
-
-2. Do *NOT* load up ACPI video, enable the hotkeys in thinkpad-acpi,
- and map them to KEY_BRIGHTNESS_UP and KEY_BRIGHTNESS_DOWN. Process
- these keys on userspace somehow (e.g. by calling xbacklight).
- The driver will do this automatically if it detects that ACPI video
- has been disabled.
+The driver will issue KEY_BRIGHTNESS_UP and KEY_BRIGHTNESS_DOWN events
+automatically for the cases were userspace has to do something to
+implement brightness changes. When you override these events, you will
+either fail to handle properly the ThinkPads that require explicit
+action to change backlight brightness, or the ThinkPads that require
+that no action be taken to work properly.
Bluetooth
@@ -1121,25 +1092,61 @@ WARNING:
its level up and down at every change.
-Volume control -- /proc/acpi/ibm/volume
----------------------------------------
+Volume control
+--------------
+
+procfs: /proc/acpi/ibm/volume
+ALSA: "ThinkPad Console Audio Control", default ID: "ThinkPadEC"
+
+NOTE: by default, the volume control interface operates in read-only
+mode, as it is supposed to be used for on-screen-display purposes.
+The read/write mode can be enabled through the use of the
+"volume_control=1" module parameter.
-This feature allows volume control on ThinkPad models which don't have
-a hardware volume knob. The available commands are:
+NOTE: distros are urged to not enable volume_control by default, this
+should be done by the local admin only. The ThinkPad UI is for the
+console audio control to be done through the volume keys only, and for
+the desktop environment to just provide on-screen-display feedback.
+Software volume control should be done only in the main AC97/HDA
+mixer.
+
+This feature allows volume control on ThinkPad models with a digital
+volume knob (when available, not all models have it), as well as
+mute/unmute control. The available commands are:
echo up >/proc/acpi/ibm/volume
echo down >/proc/acpi/ibm/volume
echo mute >/proc/acpi/ibm/volume
+ echo unmute >/proc/acpi/ibm/volume
echo 'level <level>' >/proc/acpi/ibm/volume
-The <level> number range is 0 to 15 although not all of them may be
+The <level> number range is 0 to 14 although not all of them may be
distinct. The unmute the volume after the mute command, use either the
-up or down command (the level command will not unmute the volume).
+up or down command (the level command will not unmute the volume), or
+the unmute command.
+
The current volume level and mute state is shown in the file.
-The ALSA mixer interface to this feature is still missing, but patches
-to add it exist. That problem should be addressed in the not so
-distant future.
+You can use the volume_capabilities parameter to tell the driver
+whether your thinkpad has volume control or mute-only control:
+volume_capabilities=1 for mixers with mute and volume control,
+volume_capabilities=2 for mixers with only mute control.
+
+If the driver misdetects the capabilities for your ThinkPad model,
+please report this to ibm-acpi-devel@lists.sourceforge.net, so that we
+can update the driver.
+
+There are two strategies for volume control. To select which one
+should be used, use the volume_mode module parameter: volume_mode=1
+selects EC mode, and volume_mode=3 selects EC mode with NVRAM backing
+(so that volume/mute changes are remembered across shutdown/reboot).
+
+The driver will operate in volume_mode=3 by default. If that does not
+work well on your ThinkPad model, please report this to
+ibm-acpi-devel@lists.sourceforge.net.
+
+The driver supports the standard ALSA module parameters. If the ALSA
+mixer is disabled, the driver will disable all volume functionality.
Fan control and monitoring: fan speed, fan enable/disable
@@ -1405,6 +1412,7 @@ to enable more than one output class, just add their values.
0x0008 HKEY event interface, hotkeys
0x0010 Fan control
0x0020 Backlight brightness
+ 0x0040 Audio mixer/volume control
There is also a kernel build option to enable more debugging
information, which may be necessary to debug driver problems.
@@ -1465,3 +1473,9 @@ Sysfs interface changelog:
and it is always able to disable hot keys. Very old
thinkpads are properly supported. hotkey_bios_mask
is deprecated and marked for removal.
+
+0x020600: Marker for backlight change event support.
+
+0x020700: Support for mute-only mixers.
+ Volume control in read-only mode by default.
+ Marker for ALSA mixer support.