NOTE:  I am NOT the originator of this bug report,
       but have a similar(? identical?) problem.

My machine is an Acer Aspire E17 E5-722-425Q,
and the built-in microphone (and also the mouse pad)
has never(?) been detected.  (Since I use a USB mouse
and a USB headset-with-microphone, neither problem has
ever bothered me in the slightest.)

Sometimes, the built-in WiFi is not detected (as is the
case at the moment), and, usually, the built-in Bluetooth
is not detected (also the case at the moment).  However,
I *have* observed that, at least in the case of the WiFi
(the Bluetooth is not-so-clear) it seems to be related
to the temperature (especially the external (ambient,
i.e., room temperature)).

Whilst no measurements have been made, if the ambient
temperature is sufficiently cool (cold, actually, PROBABLY
less than 10 degrees Celsius (estimated)), the WiFi is
frequently detected.  When it is warm, it is much more
hit-and-miss.  (There are some circumstantial reasons to
think, for both the WiFi and Bluetooth (both are USB),
that if there certain unclear external USB devices are also
attached when the system is booted, than one or both is
detected.  Apologies for being quite vague here, I have
never tried to confirm or characterise this incidental

Attached is the RAW report generated by apport-cli(1);
I do not know how to automagically append it to a bug
which I did not originally create.  However, please
note that, at the moment, neither the built-in USB WiFi
nor the built-in USB Bluetooth is currently detected
(and the ambient temperature is currently quite warm).

** Attachment added: "1869062"

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  Acer Aspire 7715  microphone not detected

Status in linux package in Ubuntu:

Bug description:
  System:    Host: jdole-Aspire-7715Z Kernel: 4.15.0-91-generic x86_64 bits: 64 
compiler: gcc 
             v: 7.4.0 Desktop: Cinnamon 4.4.8 wm: muffin dm: LightDM Distro: 
Linux Mint 19.3 Tricia 
             base: Ubuntu 18.04 bionic 
  Machine:   Type: Laptop System: Acer product: Aspire 7715Z v: V3.04 serial: 
             Mobo: Acer model: Aspire 7715Z v: V3.04 serial: <filter> BIOS: 
Acer v: 3.04 
             date: 12/16/2009 
  CPU:       Topology: Dual Core model: Pentium T4400 bits: 64 type: MCP arch: 
Penryn rev: A 
             L2 cache: 1024 KiB 
             flags: lm nx pae sse sse2 sse3 ssse3 bogomips: 8778 
             Speed: 2195 MHz min/max: 1200/2200 MHz Core speeds (MHz): 1: 2195 
2: 2195 
  Graphics:  Device-1: Intel Mobile 4 Series Integrated Graphics vendor: Acer 
Incorporated ALI 
             driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:2a42 
             Display: x11 server: X.Org 1.19.6 driver: modesetting unloaded: 
             resolution: 1600x900~60Hz 
             OpenGL: renderer: Mesa DRI Mobile Intel GM45 Express v: 2.1 Mesa 
             direct render: Yes 
  Audio:     Device-1: Intel 82801I HD Audio vendor: Acer Incorporated ALI 
driver: snd_hda_intel 
             v: kernel bus ID: 00:1b.0 chip ID: 8086:293e 
             Sound Server: ALSA v: k4.15.0-91-generic 
  Network:   Device-1: Qualcomm Atheros AR928X Wireless Network Adapter vendor: 
             driver: ath9k v: kernel port: 5000 bus ID: 04:00.0 chip ID: 
             IF: wlp4s0 state: up mac: <filter> 
             Device-2: Qualcomm Atheros AR8132 Fast Ethernet vendor: Acer 
Incorporated ALI 
             driver: atl1c v: port: 1000 bus ID: 05:00.0 chip ID: 
             IF: enp5s0 state: down mac: <filter> 
  Drives:    Local Storage: total: 465.76 GiB used: 33.06 GiB (7.1%) 
             ID-1: /dev/sda vendor: Western Digital model: WD5000BEVT-22A0RT0 
size: 465.76 GiB 
             speed: 3.0 Gb/s serial: <filter> 
  Partition: ID-1: / size: 211.37 GiB used: 33.06 GiB (15.6%) fs: ext4 dev: 
  Sensors:   System Temperatures: cpu: 54.0 C mobo: N/A 
             Fan Speeds (RPM): N/A 
  Repos:     No active apt repos in: /etc/apt/sources.list 
             Active apt repos in: /etc/apt/sources.list.d/google-chrome.list 
             1: deb [arch=amd64] http: // stable 
             Active apt repos in: 
             1: deb http: // tricia main upstream import backport
             2: deb http: // bionic main 
restricted universe multiverse
             3: deb http: // bionic-updates 
main restricted universe multiverse
             4: deb http: // bionic-backports 
main restricted universe multiverse
             5: deb http: // bionic-security main 
restricted universe multiverse
             6: deb http: // bionic partner
             Active apt repos in: /etc/apt/sources.list.d/skype-stable.list 
             1: deb [arch=amd64] https: // stable main
             Active apt repos in: /etc/apt/sources.list.d/teamviewer.list 
             1: deb http: // stable main
  Info:      Processes: 214 Uptime: 8h 09m Memory: 3.78 GiB used: 2.69 GiB 
(71.0%) Init: systemd 
             v: 237 runlevel: 5 Compilers: gcc: 7.5.0 alt: 7 Client: Unknown 
python3.6 client 
             inxi: 3.0.32

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