path: root/Documentation/laptops
diff options
authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2009-12-15 21:51:11 -0200
committerLen Brown <len.brown@intel.com>2009-12-15 23:57:44 -0500
commit0d204c34e85d1d63e5fdd3e3192747daf0ee7ec1 (patch)
treecdf93247a1e8cb673f0a3fcae5c193e1d55d3fc3 /Documentation/laptops
parentc7ac6291ea7ebc568a1fce16fed87d102898f264 (diff)
thinkpad-acpi: basic ALSA mixer support (v2)
Add the basic ALSA mixer functionality. The mixer is event-driven, and will work fine on IBM ThinkPads. I expect Lenovo ThinkPads will cause some trouble with the event interface. Heavily based on work by Lorne Applebaum <lorne.applebaum@gmail.com> and ideas from Matthew Garrett <mjg@redhat.com>. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Cc: Lorne Applebaum <lorne.applebaum@gmail.com> Cc: Matthew Garrett <mjg@redhat.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'Documentation/laptops')
1 files changed, 4 insertions, 3 deletions
diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index 6a5814330e51..b4ed30cb1375 100644
--- a/Documentation/laptops/thinkpad-acpi.txt
+++ b/Documentation/laptops/thinkpad-acpi.txt
@@ -1096,6 +1096,7 @@ 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.
@@ -1144,9 +1145,8 @@ The driver will operate in volume_mode=3 by default. If that does not
work well on your ThinkPad model, please report this to
-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.
+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
@@ -1478,3 +1478,4 @@ Sysfs interface changelog:
0x020700: Support for mute-only mixers.
Volume control in read-only mode by default.
+ Marker for ALSA mixer support.

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