With Kernel 5.4 hdmi sounds no available

[Mte90]

I have to test with my laptop to see if it is replicateable.

[Mte90]

I tested on my laptop qith kernel linux 5.9 and that trick is not working in my case.I will stay with 5.3 kernel to avoid any trouble.

[sidemmc]

Hmmh, tested once more, w/ kernel 5.10.3-towo.1-siduction-amd64. HDMI sound works w/ boot parameter "intel_iommu=off".
Maybe our machines are different, see my "inxi -ACGM" below.  That's all I can tell.  Stay safe.

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Machine:   Type: Laptop System: Dell product: Latitude E6440 v: 00 serial: <superuser required>
           Mobo: Dell model: 0803HT v: A00 serial: <superuser required> BIOS: Dell v: A21 date: 02/01/2018
CPU:       Info: Dual Core model: Intel Core i5-4310M bits: 64 type: MCP L2 cache: 3 MiB
           Speed: 839 MHz min/max: 800/3400 MHz Core speeds (MHz): 1: 839 2: 814
Graphics:  Device-1: Intel 4th Gen Core Processor Integrated Graphics driver: i915 v: kernel
           Device-2: AMD Sun XT [Radeon HD 8670A/8670M/8690M / R5 M330 / M430 / Radeon 520 Mobile] driver: radeon v: kernel
           Display: x11 server: X.Org 1.20.10 driver: ati,modesetting,radeon unloaded: fbdev,vesa resolution: 1920x1080
           OpenGL: renderer: Mesa DRI Intel HD Graphics 4600 (HSW GT2) v: 4.5 Mesa 20.2.6
Audio:     Device-1: Intel Xeon E3-1200 v3/4th Gen Core Processor HD Audio driver: snd_hda_intel
           Device-2: Intel 8 Series/C220 Series High Definition Audio driver: snd_hda_intel
           Sound Server: ALSA v: k5.10.3-towo.1-siduction-amd64