* opengl 'leaking' sound to input.
@ 2014-10-30 9:50 dE
2014-10-30 10:30 ` Clemens Ladisch
0 siblings, 1 reply; 3+ messages in thread
From: dE @ 2014-10-30 9:50 UTC (permalink / raw)
To: Alsa-devel
I'm trying to record audio from the analog input device of my card, but
whenever there seems to be some graphics intensive activity like
glxgears, OpenGL assisted window manager, audacity graphs etc... a noise
appears in the recording which sounds like some kind of sparking
disturbance.
I've recorded audio many times on this box before, but this started to
happen suddenly (maybe after an ugprade, but old live CDs with
proprietary nvidia drivers installed or newer nouveau drivers seem to
have the same issue).
Just to confirm, is this a hardware issue?
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: opengl 'leaking' sound to input.
2014-10-30 9:50 opengl 'leaking' sound to input dE
@ 2014-10-30 10:30 ` Clemens Ladisch
2014-10-30 15:46 ` dE
0 siblings, 1 reply; 3+ messages in thread
From: Clemens Ladisch @ 2014-10-30 10:30 UTC (permalink / raw)
To: dE, Alsa-devel
dE wrote:
> I'm trying to record audio from the analog input device of my card,
> but whenever there seems to be some graphics intensive activity like
> glxgears, OpenGL assisted window manager, audacity graphs etc...
> a noise appears in the recording which sounds like some kind of
> sparking disturbance.
Sudden changes in power consumption will affect the voltage on the
power lines. (If the GPU is powered only from the mainboard, there is
not much your PSU could do against this.) Your card (whatever it is)
apparently is not properly isolated against such fluctuations.
Regards,
Clemens
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: opengl 'leaking' sound to input.
2014-10-30 10:30 ` Clemens Ladisch
@ 2014-10-30 15:46 ` dE
0 siblings, 0 replies; 3+ messages in thread
From: dE @ 2014-10-30 15:46 UTC (permalink / raw)
To: Alsa-devel
On 10/30/14 16:00, Clemens Ladisch wrote:
> dE wrote:
>> I'm trying to record audio from the analog input device of my card,
>> but whenever there seems to be some graphics intensive activity like
>> glxgears, OpenGL assisted window manager, audacity graphs etc...
>> a noise appears in the recording which sounds like some kind of
>> sparking disturbance.
> Sudden changes in power consumption will affect the voltage on the
> power lines. (If the GPU is powered only from the mainboard, there is
> not much your PSU could do against this.) Your card (whatever it is)
> apparently is not properly isolated against such fluctuations.
>
>
> Regards,
> Clemens
The GPU takes very less power (motherboard embedded), in contrast the
CPU takes 80W and usually it'll take at least 15W (CPU scaling).
But with the CPU fluctuations, there's no nose. It has to do only with
OpenGL. If I try VESAfb with software OpenGL, there's no noise.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2014-10-30 9:50 opengl 'leaking' sound to input dE
2014-10-30 10:30 ` Clemens Ladisch
2014-10-30 15:46 ` dE
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