Subject: Sound from HDMI (pcm2) using i915kms.ko

Steve O'Hara-Smith steve at
Wed Feb 17 06:31:44 UTC 2021

On Wed, 17 Feb 2021 01:07:24 -0500
Steven Friedrich <FreeBSD at> wrote:

> Message-ID: <1772815.u6MfGjpqfb at freebsd>
> Content-Type: text/plain; charset="us-ascii"
> I am running FreeBSD 12.2-RELEASE-p3 FreeBSD 12.2-RELEASE-p3 r369261
> FreeBSD amd64
> I put hw.snd.default_unit=2 in /etc/sysctl.conf to make pcm2 default.
> cat /dev/sndstat confirms:
> Installed devices:
> pcm0: <Realtek ALC671 (Rear Analog)> (play/rec)
> pcm1: <Realtek ALC671 (Analog)> (play/rec)
> pcm2: <Intel Kaby Lake (HDMI/DP 8ch)> (play) default
> No devices installed from userspace.
> But no sound is emitted from HDMI connector.
> It's my understanding that this requires some support in the video
> driver, i915kms.ko

	The device is recognised and attached so that's OK. This may be
something simple try mixer -f dev/mixer2 for clues. 

Steve O'Hara-Smith <steve at>

More information about the freebsd-questions mailing list