I have spent some time trying to figure out this problem my self, but so far no luck.
I have audio both in headset and speakers when clean install (17.1), and updates installed (17.2), but after installing Steam (after upgrading to 17.2), sound is lost from my speakers, but not my headset.
I remember that my desktop looked very nice before installing steam, but after reboot after stem install, desktop went back to "boring" look, and the audio had gone from my integrated speakers (Harman/Kardon).
Removed steam again, same problem.
Tried to upgrade from 3.13.0-37 generic 64bit kernel (not totally sure about number) to current kernel (3.16.0-38 generic 64bit), as some people have mentioned that as an possible solution, but not in my case.
I have checked a lot of forum threads, amongst others this good one and tested some of the tings in the ubuntu forum thread he links to.
Alsa mixer have been un-installed and re-installed, same problem, nothing muted, all at 100, no sound in speakers.
Before upgrading kernel, i tried installing pavucontrol, but no difference, and nothing muted, sound bar bounces when playing audio in banshee and video in VLC.
Desktop Mannager (Mate, Cinamon, KDE etc) I'm in doubt if I even have one installed, think I have MATE, how can I check for that?
Now I have hit a cold spot, looking for help for my system specific:
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System: Host: Martin-Klap Kernel: 3.16.0-38-generic x86_64 (64 bit, gcc: 4.8.2) Desktop: N/A Distro: Linux Mint 17.2 Rafaela Machine: System: TOSHIBA product: SATELLITE P850 version: PSPKFE-06G00YN5 Mobo: TOSHIBA model: QFKAA version: 1.00 Bios: TOSHIBA version: 6.70 date: 02/20/2013 CPU: Dual core Intel Core i5-3230M CPU (-HT-MCP-) cache: 3072 KB flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 10376.8 Clock Speeds: 1: 1209.00 MHz 2: 1260.492 MHz 3: 1205.445 MHz 4: 2189.179 MHz Graphics: Card-1: Intel 3rd Gen Core processor Graphics Controller bus-ID: 00:02.0 Card-2: NVIDIA GK107M [GeForce GT 640M] bus-ID: 01:00.0 X.Org: 1.15.1 driver: nvidia Resolution: email@example.com GLX Renderer: GeForce GT 640M/PCIe/SSE2 GLX Version: 4.4.0 NVIDIA 331.113 Direct Rendering: Yes Audio: Card: Intel 7 Series/C210 Series Chipset Family High Definition Audio Controller driver: snd_hda_intel bus-ID: 00:1b.0 Sound: Advanced Linux Sound Architecture ver: k3.16.0-38-generic Network: Card-1: Intel Centrino Wireless-N 2230 driver: iwlwifi ver: in-tree: bus-ID: 03:00.0 IF: wlan0 state: up mac: <filter> Card-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller driver: r8169 ver: 2.3LK-NAPI port: 3000 bus-ID: 02:00.0 IF: eth0 state: down mac: <filter> Drives: HDD Total Size: 256.1GB (42.3% used) 1: id: /dev/sda model: KINGSTON_SV200S3 size: 256.1GB Partition: ID: / size: 30G used: 6.3G (23%) fs: ext4 ID: /home size: 8.0G used: 1.6G (21%) fs: ext4 ID: swap-1 size: 12.68GB used: 0.00GB (0%) fs: swap RAID: No RAID devices detected - /proc/mdstat and md_mod kernel raid module present Sensors: None detected - is lm-sensors installed and configured? Info: Processes: 191 Uptime: 43 min Memory: 745.2/7874.9MB Runlevel: 2 Gcc sys: 4.8.4 Client: Shell inxi: 1.8.4
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$ aplay -l **** List of PLAYBACK Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: ALC280 Analog [ALC280 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0
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ps -C pulseaudio PID TTY TIME CMD 5569 ? 00:00:00 pulseaudio