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Old 01-02-2009, 02:46 PM   #1
htpc_fail
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Registered: Jan 2009
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Ubuntu 8.10 + nvidia driver = no audio


Hi, I'm new here. I don't get any answers on Ubuntu's forum so hopefully you are more helpful here.

Ingredients:

1x HTPC
1x new NVIDIA 9400 GT graphics card
1x ECS A770M-A motherboard
1x Realtek ALC887 onboard audio controller

I know I'm mixing an ATI chipset motherboard with an NVIDIA graphics card but I originally bought an ATI Radeon HD 3450 and had major problems with undefeatable underscan. I gave up and bought an NVIDIA card and, to its credit, it works.

However, I now have no audio! I checked all the cabling and the BIOS and all looks OK. I booted into the Live CD but still had no audio. I then edited xorg.conf and changed the driver to vesa, rebooted and voila, I have sound.

Thus there is some problem with the restricted nvidia driver (downloaded from the repos via the Hardware Drivers interface) which is affecting the audio.

I'm not doing anything fancy - just a 2.5mm jack from the line-out port on the rear of the motherboard to a red and yellow RCA which connects next to the HDMI port on the back of my Samsung 1080p LCD.

How do I go about troubleshooting this error?
 
Old 01-03-2009, 12:15 PM   #2
tredegar
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Location: London, UK
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Quote:
How do I go about troubleshooting this error?
A couple of suggestions:
Have a read through /var/log/messages (warning: it's long, but you'll soon learn which "boring" bits can be skipped over) Can you spot the difference(s) from when you do and do not have sound after booting?
Did you try disabling your MoBo's ATI video chipset in your BIOS when you are using NVIDIA?
Is there an interrupt conflict? The kernel boot options noapic and / or nolapic sometimes help here.
 
Old 01-14-2009, 02:14 PM   #3
htpc_fail
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Registered: Jan 2009
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Quote:
Originally Posted by tredegar View Post
A couple of suggestions:
Have a read through /var/log/messages (warning: it's long, but you'll soon learn which "boring" bits can be skipped over) Can you spot the difference(s) from when you do and do not have sound after booting?
Did you try disabling your MoBo's ATI video chipset in your BIOS when you are using NVIDIA?
Is there an interrupt conflict? The kernel boot options noapic and / or nolapic sometimes help here.
noapic option throws loads of errors on boot-up and X won't load.

I've found some info in /var/log/messages which only appears when using the nvidia driver (i.e. I have no sound):

Jan 9 21:09:08 htpc pulseaudio[6787]: ltdl-bind-now.c: Failed to find original dlopen loader.
Jan 9 21:09:08 htpc pulseaudio[6796]: pid.c: Stale PID file, overwriting.
Jan 9 21:09:08 htpc pulseaudio[6796]: main.c: setrlimit(RLIMIT_NICE, (31, 31)) failed: Operation not permitted
Jan 9 21:09:08 htpc pulseaudio[6796]: main.c: setrlimit(RLIMIT_RTPRIO, (9, 9)) failed: Operation not permitted

dmesg says:

[ 705.005969] HDA Intel 0000:00:14.2: PCI INT A disabled
[ 705.658982] HDA Intel 0000:00:14.2: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[ 705.689934] hda_codec: Unknown model for ALC883, trying auto-probe from BIOS...
[ 725.845380] hda-intel: Invalid position buffer, using LPIB read method instead.

I have to say I'm getting pissed off now. I've been trying to get my HTPC working with Ubuntu for SIX MONTHS. It's one thing after another. I've already had to buy a new motherboard because the ATI card wouldn't work in it. Then the ATI card gave huge overscan so I bought an NVIDIA card. Now the nvidia driver disables my sound for no reason whatsoever and the nv driver fails to render quickly enough.
 
Old 02-09-2009, 04:33 AM   #4
thefear
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Registered: Feb 2009
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This seems as if it's a problem with the NVIDIA restricted driver. It's tricking your television into thinking there's an audio signal coming in with the video. You can confirm this by playing an mp3 and pulling out the DVI/HDMI cable.

See here: http://ubuntuforums.org/showthread.php?t=1047005&page=3
 
Old 02-09-2009, 10:16 PM   #5
vansch76
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Registered: Aug 2007
Location: Asheville, NC, USA
Distribution: Mint 17 Rebecca
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Hi HTPD

Some things to check.

go into the bios and see which video card is the default.
which is the first video boot device.

Im using Ubuntu 64 bit version for the AMD chipset, with the realtek audio 5.1
system built in.

What bit me for a little while was low audio no matter how much I turned up
the volume. The solution was to open the mixer, then the settings tab.
add the surround speakers, and then move the volume slider up to increase
the volume. Be sure to turn your speakers down before turning up the sliders.

There is a driver for the realtek audio for Ubuntu. Sorry I dont have the link
for it. My system found it and said it was a restricted driver.

Hope this helps

Vanessa
 
  


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