Every hardware device ( incl. the internal microphone, I suppose ) works under some driver.
How to find out which is the specific driver controlling the work of the internal microphone on a PC that works under Linux?
Lspci is a command on Unix-like operating systems that print a "list" of detailed information about all buses and PCI devices in the system.
01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Cedar HDMI Audio [Radeon HD 5400/6300/7300 Series] Subsystem: XFX Pine Group Inc. Cedar HDMI Audio [Radeon HD 5400/6300/7300 Series] Flags: bus master, fast devsel, latency 0, IRQ 29 Memory at f7e40000 (64-bit, non-prefetchable) [size=16K] Capabilities: Kernel driver in use: snd_hda_intel Kernel modules: snd_hda_intel