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When i first installed ubuntu 12.04 everything worked fine. All of a sudden my sound has stopped working!!

This has happened before [like 2 days ago], however the next day it started working again. That may happen again...[I've already rebooted 5 times]

My Sound Card is a HDA intel PCH

My Sound Chip is Intel CougarPoint HDMI

My machine is an Acer TimelineX 3830TG, heres my lcpci output

00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b4)
00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 (rev b4)
00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 3 (rev b4)
00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b4)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation HM65 Express Chipset Family LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller (rev 04)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 04)
01:00.0 VGA compatible controller: NVIDIA Corporation GF108 [GeForce GT 540M] (rev ff)
02:00.0 Ethernet controller: Atheros Communications Inc. AR8151 v2.0 Gigabit Ethernet (rev c0)
03:00.0 Network controller: Atheros Communications Inc. AR9287 Wireless Network Adapter (PCI-Express) (rev 01)
04:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5116 PCI Express Card Reader (rev 01)
05:00.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04)

I'm running a dual boot with Windows 7, sound always works there.

I've tried loading earlier kernels [3.2.0 >] but that hasn't helped.

I've tried playing with alsamixer, unmuting and raising volume, doesn't work

I've tried playing with pauvcontrol, doesnt work. Althought, strangely, when i play a song, under output i can see a bar moving implying that something is working, just the sound isn't getting through my speakers. Thus it might be a hardware problem.

I've tried unistalling and reinstalling pulsaudio annd alsamixer, doesn't work [maybe made it worse...].

I've heard reverting back to kernel 3.0... works, but i'm reluctant to try that[i dont know much about kernels].

Thank you.

Please tell me what other information you need.

EDIT: My audio has started working again after another reboot. However this time im not connected to my external audio on startup. I will see if this is the issue next time i'm at home

Edit: Connecting to external audio is not the problem.

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Do you have a dual-boot system with Windows, if so, does that give sound?? –  Sun Dial May 9 '12 at 23:34
    
Yes. It always works in windows –  Fawkes5 May 10 '12 at 0:42
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3 Answers 3

Same thing here, just installed the Ubuntu 13.04 and no sound. My hardware is:

00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)

Just used:

apt-get remove pulseaudio

Then rebooted the system and audio is back and running fine!

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I had the same problem on my Acer 5830TG.

I should remove any sound drivers and install the default alsa drivers.

Check your alsa drivers version number with

cat /proc/asound/version

The current version is 1.0.25 at the time of writing.

I updated my drivers to this version and my speakers started working. You can download the source code and compile the driver and install, or use the alsa install script from the official website.

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So removed all sound drives prior to installing the new alsa driver? –  Fawkes5 Aug 27 '12 at 21:05
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up vote 1 down vote accepted

The problem turned out to only occur if i restarted the computer. If i shutdown completely i had sound when i started up. This is solved by uninstalling pulseaudio and just using alsa. I guess i had both installed and they were conflicting somehow.

Hope this helps.

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