ubuntu14.04 by Will voice, headphones no sound

The real use of Linux every day there are new discoveries ah, as of this morning there is a computer, listen to a few songs. There is no sound in the headset after plugging in. I think this is a bad headset, put in the phone headset, I found a voice headset, very strange, I like the computer interface is not a problem, is in the system when the headset will ring, so it should not be an interface problem, and then check the computer audio settings and drivers, found to be appropriate. I have a computer to start again, found or not, very dog blood is I put the computer together, and then open. It's a very wonderful sound. I can not understand why. I just want the state of the computer to come together and turn on power management. Found closing the lid of the computer is a suspended state. Briefly say Ubuntu hangs, suspend the instruction halt run, kill the application process, run the sync system call, the file system after the completion of the write operation will stop the kernel, the user can directly turn off the power. Suspend is to suspend the hard disk, the current state of the computer all loaded into memory, that is, the hard drive to stop power. But the memory has to be powered.

The advantage is that recovery is fast. The disadvantage is to keep the power supply, the power will have to restart.

Hibernation is to save the current state of the system to a hibernation file on the hard disk, and then all the devices are off, you can safely turn off the power and reboot the next time. Will voluntarily invoke the saved files on the hard drive and revert to the state before the shutdown. The advantage is that electricity is not required. Can sleep for a very long time. The disadvantage is that the recovery speed is slow (relative to hang). It only takes 2 or 3 seconds to suspend recovery. Very fast. Sleep recovery takes more than 10 seconds, slower than hangs. But much faster than restarting.

So I guess it might be a permissions problem, or it might be that the memory doesn't load all the data, so this problem is not a very good explanation on Baidu. This is just one of my push test, what is the problem also hope you master enlighten.

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ubuntu14.04 by Will voice, headphones no sound