nvhda

General info

Linux kernel module to turn on/off Nvidia HD audio device on notebooks. Blatantly copied from Lekensteyn's bbswitch module.

• Due to a bug regarding re-reading the header type in kernels 4.9 - 4.13, this won't work on these series. Kernels 4.4, 4.14+ are known to work
• This module will (hopefully) once being superseded by Lukas Wunner's patches https://bugs.freedesktop.org/show_bug.cgi?id=75985#c37

Install

# make
# sudo make install

Install using DKMS

# sudo make -f Makefile.dkms

Uninstall

# sudo make uninstall

or

# sudo make -f Makefile.dkms uninstall

Usage

Since its logic is copied from the bbswitch module, it works like that.

Load Module

# sudo modprobe nvhda

Get status:

# cat /proc/acpi/nvhda

Turn audio on/off:

# sudo tee /proc/acpi/nvhda <<<ON
# sudo tee /proc/acpi/nvhda <<<OFF

Check dmesg for messages.

How it works

See:

• https://devtalk.nvidia.com/default/topic/1024022/linux/gtx-1060-no-audio-over-hdmi-only-hda-intel-detected-azalia/post/5211273/#5211273
• https://bugs.freedesktop.org/show_bug.cgi?id=75985

ToDo

• lots of things