On 2015-11-10 20:26, Tanu Kaskinen wrote:
On Tue, 2015-11-10 at 14:52 +0100, David Henningsson wrote:
On 2015-11-10 14:40, Tanu Kaskinen wrote:
On Thu, 2015-11-05 at 09:04 +0100, David Henningsson wrote:
On 2015-11-04 12:09, Tanu Kaskinen wrote:
On Mon, 2015-11-02 at 09:36 +0100, David Henningsson wrote:
On 2015-11-01 13:41, Tanu Kaskinen wrote:
I'm not sure if we can fix this upstream. To me it would seem logical
for the kernel to promise that "Front" only refers to line out, and if
on some machine it also affects the headphone path, then that should be
considered a kernel bug, and the kernel should rename the element.
David, what do you think?
Well, technically what comes out of a headphone are front left and front
right channels, so to some degree it makes sense that "Front" should be
a part of the headphone path.
Sure, "Front" could be defined to affect both line out and headphone
paths. The problem is that currently it seems to mean "line out only"
on some machines and "line out and headphones" on other machines. If
"Front" is defined to affect both paths, then we need some other name
for controls that only affect the line out path.
I believe the logical name for such a control would be "Line Out Front".
(Which we currently do not support in the line out path, btw, and I
haven't seen it in the wild, either.)
I suppose the kernel is usually able to automute line out when
headphones are plugged in?
Yes.
If so, then why doesn't the kernel expose
the mute control to the userspace?
I'm not sure I understand what "the mute control" refers to, but in this
case the mute control for the front line out jack is called "Front" (or
"Front Playback Switch" being the full name).
I meant the general case, where the kernel knows how to automute line
out. You said that you haven't seen "Line Out Front" anywhere. Why is
that, if the kernel knows how to mute line out?
The kernel is fully aware that the jack is a line out jack (as you can
see on the jack kcontrol). It's just that the algorithm for naming
volume/mute kcontrols is not trivial; on one hand, you want as short
name as possible (max 44 characters, minus ' Playback Switch'), but
still unique and descriptive, taking location, channel map and device
into account. Then add that a volume/mute might control more than one,
but not all, of the outputs...some use cases are not handled optimally.
--
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic
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