Hello, I am new to ubuntu, I've installed it recently and there is a problem with my sound. Ubuntu version is 12.04 LTS (64 bit) and computer is acer aspire v3-551g-10466G75Makk laptop.
Sound is muffled, like sound source is under blankets. Voices are like in the distance. I can clearly hear the difference between the sound in windows and the sound in ubuntu, especially in heaphones (the sound in speakers is affected too). It doesn't depend on program, I tried flash (youtube), rhythmbox and movie player. What I have already tried to solve the problem:
a) Updating from Ubuntu Audio Dev team PPA - nothing changed
b) Removing PulseAudio - nothing changed
c) Installing Realtek High Definition Audio Codecs - sound disappeared
d) Booting from Ubuntu 13.04 LiveCD (PulseAudio version 3.0) - sound is the same
e) Playing with alsamixer - nothing changed
The only thing that solved the problem was PulseAudio equalizer (I use Dolby Home Theater on Windows as equalizer) that I installed from here: http://www.webupd8.org/2011/04/syste...equalizer.html
I know it's old and unsupported version but the new one (from here: http://www.webupd8.org/2013/03/insta...in-system.html) brings crackling. The old one with "Soft" preset makes sound almost perfect but brings another problem: strange volume levels. Quiet sounds are... TOO quiet. For example, quiet beginning of the song. Or whispering. I have to to increase volume to hear these sounds, but when sound must increase just a bit I have to decrease volume because it's getting too loud. Example: http://www.youtube.com/watch?v=34C41eEpM48
In the beginning of this melody normal volume for me is about 60%. In the end it must be not greater than 40% or I lose hearing.
Problem wih volume appears only with equalizer enabled. When I disable EQ it's okay, but if I disable it the sound will become muffled. Here is some information that could be important.
sudo aplay -l:
**** List of PLAYBACK Hardware Devices ****
card 0: HDMI [HDA ATI HDMI], device 3: HDMI 0 [HDMI 0]
Subdevice #0: subdevice #0
card 1: Generic [HD-Audio Generic], device 0: ALC271X Analog [ALC271X Analog]
Subdevice #0: subdevice #0
lspci | grep "Audio":
00:01.1 Audio device: Advanced Micro Devices [AMD] nee ATI Device 9902
00:14.2 Audio device: Advanced Micro Devices [AMD] Hudson Azalia Controller (rev 01)
Right now I have almost clear system only wih updates from default repositories and proprietary driver for ATI graphics, I didn't change anything yet. I hope someone can write something that could solve this problem.
P.S. Sorry if something isn't clear after my explanation. English is not my native language.