Bug 53021

Summary:	unrecognized tv tuner card causes distorted sound
Product:	PulseAudio	Reporter:	alex <devkral>
Component:	core	Assignee:	pulseaudio-bugs
Status:	RESOLVED MOVED	QA Contact:	pulseaudio-bugs
Severity:	normal
Priority:	medium	CC:	lennart
Version:	unspecified
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description alex 2012-07-31 21:36:28 UTC

the sound is distorted after I installed an old tv tuner card (sadly I don't the model). It is from an acer apire e380.
I get an error message when I boot:
Unknown header type 7f. Ignore device
You don't have noise until you play a sound.
My theory is that if device information and block devices in /dev are inconsistent the bug appears

Comment 1 alex 2012-10-08 09:04:03 UTC

ok, I found the model, and I "fixed" the problem by including the driver.
Philips Semiconductors SAA7133/SAA7135 Video Broadcast Decoder (rev d1)

But somehow the bug still apears sometimes. And sometimes remains over reboots. And sometimes just disappear.

Also I found out why the sound is distorted:
left and right channel were mixed to a mono channel (frontleft-testsound was hearable on the right side and the way around). It seems as if a memory corruption takes place.
Related bugs are:
https://bugs.freedesktop.org/show_bug.cgi?id=48306

https://bugs.freedesktop.org/show_bug.cgi?id=55438 (sorry for posting a second bug related to this problem)

Comment 2 alex 2012-10-08 09:19:09 UTC

It seems as if shm makes some problems.After using the command the sound gets normal (tests needed to be sure; it could be a coincindence):
pulseaudio --cleanup-shm

Comment 3 alex 2012-10-09 12:26:14 UTC

test failed. Again there is the problem with the channel map and using the command didn't help.

Additional information: What I used: pulseaudio git commit f0432ce6aedca5956f6086824120bb03559e6534 on archlinux

Ah another strange thing:
the normal speakers work flawless, just the headphones have this problem.
Also the jack detection doesn't work anymore

Comment 4 GitLab Migration User 2018-07-30 10:35:10 UTC

-- GitLab Migration Automatic Message --

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