Mute button

From ThinkWiki
Revision as of 19:23, 11 June 2009 by Newhren (Talk | contribs) (←Created page with 'Starting from Linux version 2.6.23, kernel passes OSI string "<tt>!Linux</tt>" to ACPI (instead of "<tt>Linux</tt>"). There is a number of reasons for that (see details in...')
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Starting from Linux version 2.6.23, kernel passes OSI string "!Linux" to ACPI (instead of "Linux"). There is a number of reasons for that (see details in drivers/acpi/osl.c in the kernel source). But IBM/Lenovo has a consistently good record of supporting Linux, so this trick is not necessary for Thinkpads. Moreover, OSI string "Linux" is needed to make the Mute button work. For Thinkpads R61, T61 and X61, there are already hooks for that in drivers/acpi/blacklist.c. For most other models, you need to pass the string acpi_osi="Linux" to the kernel as a boot parameter.

Needed for models

T400, X200, X301