HDMI sound output is high pitched

[Aloster]

I'm running Fedora 20 Gnome on a Lenovo e540 laptop and I'm experiencing some audio issues when using my tv over hdmi. The sound is high pitched on all sources I've tried, youtube, vlc etc. IIt was not like this from the beginning, I was watching a movie using vlc and the computer went into sleep mode and when I resumed the video, the sound had become distorted. I tried restarting but nothing helped.

The computer orginally came bundled with Windows 8 and the audio issue happened occasionally on that OS as well, though I wasn't able to pinpoint the circumstances. It seemed to be very random, for example, I was about to watch a movie and the sound was distorted and I started googling, 10 minutes later I tried again and it worked, whitout having changed anything. Here on fedora it is from all sources though and seemingly all the time.

I found this bug https://bugs.freedesktop.org/show_bug.cgi?id=75537#c12, and what the poster "tmacalp" is describing is very similar to my problem. Should I post comments to that bug report as well? If so, do I just create an account and make a comment?

I've been able to play videos without problems with my friends MacBook so the tv set shouldn't be an issue. Since it's present across both Fedora and Windows, could it be an hardware fault? Since it worked most of the time on windows and before the "sleep event" on fedora I'm thinking it's a driver issue? I tried installing kmod nvidia proprieteray drivers to remedy but I messed up so I reverted to nouveau. This was after the issue started so this shouldn't really influence anything. I've got an Intel integrated GPU and a discrete nvidia one, but I don't know whether that would influence.

I don't have much experience troubleshooting Linux/Fedora. What system info should I provide?

I'm grateful for any help.

[dobbi]

Don't really know.

But you could read the NVidia HDMI article.
http://http.download.nvidia.com/XFre...dmi-audio.html

Explains a lot how it works.


https://superuser.com/questions/7209...ched-over-hdmi

People found some solutions here.
https://bugs.launchpad.net/ubuntu/+s...r/+bug/1288004

Patch submited for i915 Intel
https://bugzilla.kernel.org/show_bug.cgi?id=74861

[Aloster]

Everything seems to be working, thank you for your help! I just added the line

i915.disable_power_well=0

as a boot parameter in grub, as described in https://bugzilla.kernel.org/show_bug.cgi?id=74861. I will add it to the config files later but it should have the same effect.

Regarding the i915 patch, how is it merged into the kernel code? Is it already that, through that patch only? If not, can I track it to see when it's incorporated into the kernel? Is this what's usually referred to as "upstream merge" (the merging into the kernel)?

[dobbi]

Regarding the i915 patch, how is it merged into the kernel code? Is it already that, through that patch only? If not, can I track it to see when it's incorporated into the kernel? Is this what's usually referred to as "upstream merge" (the merging into the kernel)?

From what I understand, one guy that knows another sends the patch to him and he applies it to his copy of the kernel, if that person is Linus Torvalds everyone who downloads his copies gets it, and yes it is supposed to be already there.

You can file a bug report in the:

https://bugzilla.redhat.com

and/or

https://bugzilla.kernel.org/

Just send the following:

Video board driver, type and manufacturer

lspci -vnnk | awk '/VGA/,/^$/'

Sound board driver, type and manufacturer

lspci -vnnk | awk '/Audio/,/^$/'

Alsa debug information that may be needed like devices it finds, dmesg, configuration.

$ alsa-info --with-devices --with-dmesg --with-configs --upload

This last one will give you a link to a webpage to where it uploaded all that information if you don't want to upload that you can set it to dump it to a file in your system with --output, is just the link is easier, for more information you can get it in:

alsa-info --help

and

man alsactl

and

/usr/share/doc/alsa-lib-devel/doxygen/html