I have this problem with Ubuntu 18.04, 18.10 and Linux Mint 19, on 2 computers :
HP Pavilion dv6700 and Acer Extensa 5620Z, both with a Realtek ALC268 chipset.
Audio is working but not internal microphone (and on HP Pavilion, external 
microphone doesn't work too).

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  Internal microphone doesn't work at all

Status in alsa-driver package in Ubuntu:

Bug description:
  My computer is Acer TravelMate 7520G. Ubuntu 9.04 Jaunty Jackalope.

  Sound card is working otherwise ok, but the internal microphone does't
  work at all. I've tired modifying the alsa-base.conf file's last row
  to read like: options snd-hda-intel model=acer-aspire, options snd-
  hda-intel model=acer and the third one for digital built-in acer mic.
  None of the above have worked.

  From the user's point of wiev it seems like the microphone cannot be 
activated at all. If I try to activate my microphone from sound menu (from top 
right corner on desk top) -> volume control -> record (tab), the microphone is 
allways showing a red cross (like it is muted). The red cross can be removed, 
but the red cross appears back after closing the control panel. 

  After test recording with mic activated the result is only static
  noise during play-back.

  ProblemType: Bug
   **** Luettelo PLAYBACK laitteista ****
   kortti 0: SB [HDA ATI SB], laite 0: ALC268 Analog [ALC268 Analog]
     Alalaitteet: 1/1
     Alalaite #0: subdevice #0
  Architecture: i386
   **** Luettelo CAPTURE laitteista ****
   kortti 0: SB [HDA ATI SB], laite 0: ALC268 Analog [ALC268 Analog]
     Alalaitteet: 1/1
     Alalaite #0: subdevice #0
   /dev/snd/controlC0:  kone       3631 F.... mixer_applet2
   Card hw:0 'SB'/'HDA ATI SB at 0xf0600000 irq 16'
     Mixer name : 'Realtek ALC268'
     Components : 'HDA:10ec0268,10250124,00100003 
     Controls      : 11
     Simple ctrls  : 8
   [   26.471439] sky2 eth0: enabling interface
   [   26.471669] ADDRCONF(NETDEV_UP): eth0: link is not ready
   [   31.097025] eth1: no IPv6 routers present
   [   84.500043] Clocksource tsc unstable (delta = -288762894 ns)
  DistroRelease: Ubuntu 9.04
  NonfreeKernelModules: fglrx
  Package: alsa-base 1.0.18.dfsg-1ubuntu8
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Uname: Linux 2.6.28-11-generic i686

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