Ubuntu 20.04: No sound

[Volker Wysk]

Am Montag, den 18.05.2020, 23:52 +0200 schrieb Liam Proven:
> On Mon, 18 May 2020 at 23:44, Volker Wysk <post at volker-wysk.de>
> wrote:
> > Any hints?
> 
> Model of Vaio?

Sony Vaio VPCEB1Z1E

> Upgrade the firmware?

I've found the Sony support page for the Vaio VPCEB1Z1E, but there
isn't any firmware. There are some "update programs", but it's all for
Windows. Searching on packages.ubuntu.com for "firmware sony" /
"firmware vaio" didn't work either.

> Install any available proprietary drivers in Control Panel?

Sorry, I've searched for 15 minutes and couldn't find out, what the
Control Panel is.

There is a program called "Anwendungen und Aktualisierungen"
(applications and upgrades) which has a tab called "Zusätzliche
Treiber" (additional drivers), but it says "No additional drivers are
available". At the bottom there is "Es werden keine prorietären Treiber
verwendet" (No propriatary drivers are used.).

> Add the ubuntu-restricted-extras package just in case?

Done, but no effect.

> Connect to a cable (in case of wifi problems) and do a full update?

I've just installed Ubuntu 20.04, over WLAN. No problems during the
installation procedure.

The laptop has a blue "Fn" key, and you can change the volume with a
keyboard combination. When pressed, "Dummy-Ausgabe" (dummy output) is
shown. Is this a sign that some firmware is missing?

Bye,
Volker