[alsa-devel] Keyboard volume buttons
Hi,
Can anyone tell me how keyboard's volume buttons are converted into real volume change? Will there be an application that monitors the keyboard volume button events and call ALSA API to set the volume?
Thanks Harsha
On Fri, Feb 27, 2009 at 3:20 AM, Harsha, Priya priya.harsha@intel.com wrote:
Hi,
Can anyone tell me how keyboard's volume buttons are converted into real volume change? Will there be an application that monitors the keyboard volume button events and call ALSA API to set the volume?
Thanks Harsha
Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
Yes, X catches keypress and lets the window manager know about it. In case of metacity, which is what GNOME uses, if that key is bound to a volume control action, it calls gnome-volume-control to do the apropriate change. I _believe_ it is so, never checked source code.
Vedran Miletić
At Fri, 27 Feb 2009 08:06:43 +0100, Vedran Miletić wrote:
On Fri, Feb 27, 2009 at 3:20 AM, Harsha, Priya priya.harsha@intel.com wrote:
Hi,
Can anyone tell me how keyboard's volume buttons are converted into real volume change? Will there be an application that monitors the keyboard volume button events and call ALSA API to set the volume?
Thanks Harsha
Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
Yes, X catches keypress and lets the window manager know about it. In case of metacity, which is what GNOME uses, if that key is bound to a volume control action, it calls gnome-volume-control to do the apropriate change. I _believe_ it is so, never checked source code.
For most ACPI-events, yes, it works like that. The window manager is responsible for the volume control.
In some cases, the volume is changed in the driver side. For example, some devices issue an IRQ per volume-control action. Some HD-audio codecs have the volume-knob widget that is required to be handled by the codec driver via unsolicited events.
Also, some (old) thinkpads have their own hardware layer and the h/w volume is handled differently.
Takashi
On Fri, 27.02.09 08:06, Vedran Miletić (rivanvx@gmail.com) wrote:
On Fri, Feb 27, 2009 at 3:20 AM, Harsha, Priya priya.harsha@intel.com wrote:
Hi,
Can anyone tell me how keyboard's volume buttons are converted into real volume change? Will there be an application that monitors the keyboard volume button events and call ALSA API to set the volume?
Thanks Harsha
Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
Yes, X catches keypress and lets the window manager know about it. In case of metacity, which is what GNOME uses, if that key is bound to a volume control action, it calls gnome-volume-control to do the apropriate change. I _believe_ it is so, never checked source code.
It is actually not the window manager.
In GNOME it is a little daemon that runs in the session and is called gnome-settings-daemon. It does a lot of little thinks, one of them handling volume key events and showing a nice OSD for it.
Lennart
Thanks a lot. That helps!
-----Original Message----- From: alsa-devel-bounces@alsa-project.org [mailto:alsa-devel-bounces@alsa-project.org] On Behalf Of Lennart Poettering Sent: Saturday, February 28, 2009 12:30 PM To: alsa-devel@alsa-project.org Subject: Re: [alsa-devel] Keyboard volume buttons
On Fri, 27.02.09 08:06, Vedran Miletić (rivanvx@gmail.com) wrote:
On Fri, Feb 27, 2009 at 3:20 AM, Harsha, Priya priya.harsha@intel.com wrote:
Hi,
Can anyone tell me how keyboard's volume buttons are converted into real volume
change? Will there be an application that monitors the keyboard volume button events and call ALSA API to set the volume?
Thanks Harsha
Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
Yes, X catches keypress and lets the window manager know about it. In case of metacity, which is what GNOME uses, if that key is bound to a volume control action, it calls gnome-volume-control to do the apropriate change. I _believe_ it is so, never checked source code.
It is actually not the window manager.
In GNOME it is a little daemon that runs in the session and is called gnome-settings-daemon. It does a lot of little thinks, one of them handling volume key events and showing a nice OSD for it.
Lennart
-- Lennart Poettering Red Hat, Inc. lennart [at] poettering [dot] net ICQ# 11060553 http://0pointer.net/lennart/ GnuPG 0x1A015CC4 _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
participants (4)
-
Harsha, Priya -
Lennart Poettering -
Takashi Iwai -
Vedran Miletić