[pulseaudio-discuss] [PATCH] fix the assumption that volume is always positive

[Lu Guanqun]

On Thu, May 26, 2011 at 09:21:45PM +0800, Colin Guthrie wrote:
> 'Twas brillig, and Tanu Kaskinen at 26/05/11 13:48 did gyre and gimble:
> > On Thu, 2011-05-26 at 14:08 +0300, Tanu Kaskinen wrote:
> >> On Thu, 2011-05-26 at 09:50 +0100, Colin Guthrie wrote:
> >>> 'Twas brillig, and Lu Guanqun at 26/05/11 09:49 did gyre and gimble:
> >>>> Add a variable to track whether the actual volume is set or not.
> >>>> Suppose this:
> >>>> 	min volume: -126	max volume: 0
> >>>> then when user wants to set some constant volume to -10, it would fail.
> >>>
> >>> Tanu, are you OK with this patch?
> >>
> >> Maybe, maybe not. I posted a question to alsa-devel:
> >> http://mailman.alsa-project.org/pipermail/alsa-devel/2011-May/040213.html
> >>
> >> If negative steps are allowed, I expect there to be more bugs.
> > 
> > I got a confirmation that negative volumes are allowed, so the patch
> > should be fine. Somebody should review the alsa mixer code for other
> > cases of the invalid assumption (I plan to do it in the indefinite
> > future, if nobody else does it).
> 
> OK, sounds good. I will queue it up at my end.

Thanks!

> 
> Judging by Takashi's comments on alsa-devel, in an ideal world the
> driver would be updated too to avoid the use of the negative steps
> (which is "funky" :p), but we still need this fix all the same.

I'll push a patch into the mis-behaved alsa driver to fix the negative
volume.

Thanks Tanu's info as well.

> 
> Thanks for the patch.
> 
> Col
> 
> 
> -- 
> 
> Colin Guthrie
> gmane(at)colin.guthr.ie
> http://colin.guthr.ie/
> 
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-- 
guanqun