How do I get sound to work on Asus Transformer T100 with Ubuntu 16.04?

[peridian]

Hi,

I've been following the instructions for installing Ubuntu 16.04 LTS (kernel: 4.10.0-37) onto my old Transformer T100 (model: T100TA-DK002H) found here: http://www.jfwhome.com/2016/01/04/la...e-asus-t100ta/

The system boots, and a full apt-get upgrade has run fine. Everything (that I care about) works, except for the sound. In the main UI for Sound settings, it lists "Output -> Play sound through" with "Dummy Output".

Following the instructions, when I run the below command, I get the following output:

> sudo alsactl -f /var/lib/alsa/asound.state restore

No state is present for card bytcrrt5640
Found hardware: "bytcr-rt5640" "" "" "" ""
Hardware is initialized using a generic method
No state is present for card bytcrrt5640

The original post (http://www.jfwhome.com/2014/03/07/pe...mer-book-t100/) talks about pulling down Intel firmware files from ChromiumOS and putting them in the system directories. However in 16.04 it appears these files are already present, so I don't want to go overwriting them unnecessarily.

There are various posts around the web about how to get this to work, but they all vary in model and Ubuntu version, so I don't know which instructions to follow.

Does anybody know which files are needed to get Ubuntu 16.04 to work on the specific model of sound device on this tablet?

Regards,
Rob.

[peridian]

Okay, got this working. After a bit of fiddling around, I discovered that the alsa ucm folders for this particular device were missing from the Ubuntu install. Firmware drivers were already correct.

Thanks to a post here: https://plus.google.com/117678584843...ts/Z47kmVKe13K

All I needed to do was:

• download the UCM files,
• copy the two folders for the sound device (as indicated by the linuxium-install-UCM-files.sh script, also referenced in that post) to the ucm folder (see below)
• delete the state file at /var/lib/alsa/asound.state
• reboot

sudo cp -vrf UCM-master/bytcr-rt5640 /usr/share/alsa/ucm
sudo cp -vrf UCM-master/chtrt5645 /usr/share/alsa/ucm

[shadoogie2960]

Thanks a lot ! Worked for me on my T100TA with Lubuntu 18.04

[fundatillus]

Thanks, @peridian! This got the sound working on my Acer Chromebook CB3-131.

[greatbigbadger]

Where do you download the UCM files from?