Bug 56851

Summary:	Thinklight procfs not working as expected on Thinkpad x230.
Product:	Drivers	Reporter:	guerremdq (guerremdq)
Component:	Other	Assignee:	drivers_other
Status:	NEW ---
Severity:	normal	CC:	dererk, kevin
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	3.2.0-41	Subsystem:
Regression:	No	Bisected commit-id:

Description guerremdq 2013-04-19 15:13:50 UTC

Thinklight procfs not working as expected on Thinkpad x230.


~ # arch 
i686
~ # uname -r
3.2.0-41-generic-pae
~ # cat /sys/devices/platform/thinkpad_acpi/leds/tpacpi\:\:thinklight/brightness
0
~ # echo 255 > /sys/devices/platform/thinkpad_acpi/leds/tpacpi\:\:thinklight/brightness 
~ # cat /sys/devices/platform/thinkpad_acpi/leds/tpacpi\:\:thinklight/brightness
0

Comment 1 Dererk 2013-06-12 16:51:53 UTC

Update, problem still exists as for 3.10-rc4.

Comment 2 Kevin Locke 2016-01-12 18:46:20 UTC

For reference, this is currently being discussed on the ibm-acpi-devel mailing list.[1]  Unfortunately, it looks like this is not easily fixable on the T430, which calls directly into the SMBIOS.[2]  It's unclear whether that is also the case on the X230.

1.  http://sourceforge.net/p/ibm-acpi/mailman/message/34759769/
2.  http://sourceforge.net/p/ibm-acpi/mailman/message/34760107/