In the laptop types HP Compac CQ40-401 is generally a problem they have compatible hardware, but the sound is a bit problematic, and to fix the problem follow the steps below:
Go to Application > Accesories > Terminal
login as root by type
add this line in text editor :
Go to System > Preference > Sound
select all for Alsa Sound settings
Go to terminal and type :
change this line :
to
ex :
Save and Reboot your machine by type :
Good Luck...!!
Go to Application > Accesories > Terminal
login as root by type
$ sudo su
$ gedit /etc/modprobe.d/alsa-base.conf
add this line in text editor :
alias snd-card-0 snd-hda-intel
alias sound-slot-0 snd-hda-intel
options snd-hda-intel model=dell-m4-1
options snd-hda-intel enable_msi=1
Go to System > Preference > Sound
select all for Alsa Sound settings
Go to terminal and type :
$ gedit /etc/group
change this line :
audio:x:29:pulse
to
audio:x:29:[username],pulse
ex :
audio:x:29:minez,pulse
Save and Reboot your machine by type :
$ reboot
Good Luck...!!
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