1 files changed, 15 insertions, 60 deletions

diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index fc15538d8b46..1565eefd6fd5 100644
--- a/Documentation/laptops/thinkpad-acpi.txt
+++ b/Documentation/laptops/thinkpad-acpi.txt
@@ -960,70 +960,21 @@ Sysfs notes:
         subsystem, and follow all of the hwmon guidelines at
         Documentation/hwmon.
 
+EXPERIMENTAL: Embedded controller register dump
+-----------------------------------------------
 
-EXPERIMENTAL: Embedded controller register dump -- /proc/acpi/ibm/ecdump
-------------------------------------------------------------------------
-
-This feature is marked EXPERIMENTAL because the implementation
-directly accesses hardware registers and may not work as expected. USE
-WITH CAUTION! To use this feature, you need to supply the
-experimental=1 parameter when loading the module.
-
-This feature dumps the values of 256 embedded controller
-registers. Values which have changed since the last time the registers
-were dumped are marked with a star:
-
-[root@x40 ibm-acpi]# cat /proc/acpi/ibm/ecdump
-EC       +00 +01 +02 +03 +04 +05 +06 +07 +08 +09 +0a +0b +0c +0d +0e +0f
-EC 0x00:  a7  47  87  01  fe  96  00  08  01  00  cb  00  00  00  40  00
-EC 0x10:  00  00  ff  ff  f4  3c  87  09  01  ff  42  01  ff  ff  0d  00
-EC 0x20:  00  00  00  00  00  00  00  00  00  00  00  03  43  00  00  80
-EC 0x30:  01  07  1a  00  30  04  00  00 *85  00  00  10  00  50  00  00
-EC 0x40:  00  00  00  00  00  00  14  01  00  04  00  00  00  00  00  00
-EC 0x50:  00  c0  02  0d  00  01  01  02  02  03  03  03  03 *bc *02 *bc
-EC 0x60: *02 *bc *02  00  00  00  00  00  00  00  00  00  00  00  00  00
-EC 0x70:  00  00  00  00  00  12  30  40 *24 *26 *2c *27 *20  80 *1f  80
-EC 0x80:  00  00  00  06 *37 *0e  03  00  00  00  0e  07  00  00  00  00
-EC 0x90:  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00
-EC 0xa0: *ff  09  ff  09  ff  ff *64  00 *00 *00 *a2  41 *ff *ff *e0  00
-EC 0xb0:  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00
-EC 0xc0:  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00
-EC 0xd0:  03  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00
-EC 0xe0:  00  00  00  00  00  00  00  00  11  20  49  04  24  06  55  03
-EC 0xf0:  31  55  48  54  35  38  57  57  08  2f  45  73  07  65  6c  1a
-
-This feature can be used to determine the register holding the fan
-speed on some models. To do that, do the following:
+This feature is not included in the thinkpad driver anymore.
+Instead the EC can be accessed through /sys/kernel/debug/ec with
+a userspace tool which can be found here:
+ftp://ftp.suse.com/pub/people/trenn/sources/ec
 
+Use it to determine the register holding the fan
+speed on some models. To do that, do the following:
         - make sure the battery is fully charged
         - make sure the fan is running
-        - run 'cat /proc/acpi/ibm/ecdump' several times, once per second or so
-
-The first step makes sure various charging-related values don't
-vary. The second ensures that the fan-related values do vary, since
-the fan speed fluctuates a bit. The third will (hopefully) mark the
-fan register with a star:
-
-[root@x40 ibm-acpi]# cat /proc/acpi/ibm/ecdump
-EC       +00 +01 +02 +03 +04 +05 +06 +07 +08 +09 +0a +0b +0c +0d +0e +0f
-EC 0x00:  a7  47  87  01  fe  96  00  08  01  00  cb  00  00  00  40  00
-EC 0x10:  00  00  ff  ff  f4  3c  87  09  01  ff  42  01  ff  ff  0d  00
-EC 0x20:  00  00  00  00  00  00  00  00  00  00  00  03  43  00  00  80
-EC 0x30:  01  07  1a  00  30  04  00  00  85  00  00  10  00  50  00  00
-EC 0x40:  00  00  00  00  00  00  14  01  00  04  00  00  00  00  00  00
-EC 0x50:  00  c0  02  0d  00  01  01  02  02  03  03  03  03  bc  02  bc
-EC 0x60:  02  bc  02  00  00  00  00  00  00  00  00  00  00  00  00  00
-EC 0x70:  00  00  00  00  00  12  30  40  24  27  2c  27  21  80  1f  80
-EC 0x80:  00  00  00  06 *be  0d  03  00  00  00  0e  07  00  00  00  00
-EC 0x90:  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00
-EC 0xa0:  ff  09  ff  09  ff  ff  64  00  00  00  a2  41  ff  ff  e0  00
-EC 0xb0:  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00
-EC 0xc0:  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00
-EC 0xd0:  03  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00
-EC 0xe0:  00  00  00  00  00  00  00  00  11  20  49  04  24  06  55  03
-EC 0xf0:  31  55  48  54  35  38  57  57  08  2f  45  73  07  65  6c  1a
-
-Another set of values that varies often is the temperature
+        - use above mentioned tool to read out the EC
+
+Often fan and temperature values vary between
 readings. Since temperatures don't change vary fast, you can take
 several quick dumps to eliminate them.
 
@@ -1073,6 +1024,10 @@ ThinkPad-specific interface.  The driver will disable its native
 backlight brightness control interface if it detects that the standard
 ACPI interface is available in the ThinkPad.
 
+If you want to use the thinkpad-acpi backlight brightness control
+instead of the generic ACPI video backlight brightness control for some
+reason, you should use the acpi_backlight=vendor kernel parameter.
+
 The brightness_enable module parameter can be used to control whether
 the LCD brightness control feature will be enabled when available.
 brightness_enable=0 forces it to be disabled.  brightness_enable=1