| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Tue, 30 Nov 2010 21:58:44 -0500 From: Calvin Walton <calvin.walton@...il.com> To: Lukas Hejtmanek <xhejtman@....muni.cz> Cc: linux-kernel@...r.kernel.org Subject: Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does not work On Tue, 2010-11-30 at 19:53 +0100, Lukas Hejtmanek wrote: > Hi, > > in 2.6.26, mute button worked as expected on my ThinkPad T61 - it toggled > mute with mixer applet notification. In 2.6.37-rc1, it only mutes without any > event to any mixer applet. The mute button on this series of Thinkpads is a little weird (I have an R61i, which is the same iirc) - the behaviour of the button depends on the ACPI firmware. With no operating system running, it behaves as a persistent hardware mute. Windows apparently uses a proprietary driver to control the volume - part of this functionality has been added to the Linux thinkpad_acpi driver, but it's not fully enabled yet. By default on this series of laptops, Linux runs with the ACPI _OSI(Linux) exported - when the bios of this laptop model sees that it's running on Linux, it disables the hardware mute functionality and the mute button acts as a standard keyboard key. Search your dmesg for lines containing '_OSI(Linux)' - it should say that a BIOS query was honoured. Make sure you do not have 'acpi_osi="! Linux"' on your kernel command line. -- Calvin Walton <calvin.walton@...il.com> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists