15 RC 1 - Sound problem intel_hda

I use a notebook ASUS TUF Gaming FX 705 and installed 15 RC 1 without problems. The system runs stable and everything works but the sound. I could not any sound. I followed the Slackware hardware guide
https://docs.slackware.com/howtos:ha..._snd-hda-intel
but it did not help.

The stats of my notebook:
System: Kernel: 5.14.4 x86_64 bits: 64 compiler: gcc v: 2.37-slack15 Desktop: KDE Plasma 5.22.5 tk: Qt 5.15.3 wm: kwin_x11
vt: 1 dm: startx Distro: Slackware 15.0
Machine: Type: Laptop System: ASUSTeK product: TUF Gaming FX705GM_PX705GM v: 1.0 serial: <filter>
Mobo: ASUSTeK model: FX705GM v: 1.0 serial: <filter> UEFI: American Megatrends v: FX705GM.307 date: 05/25/2020
CPU: Info: 6-Core model: Intel Core i7-8750H bits: 64 type: MT MCP arch: Kaby Lake note: check rev: A cache: L2: 9 MiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 52799
Speed: 2200 MHz min/max: 800/2200 MHz Core speeds (MHz): 1: 2200 2: 2200 3: 2200 4: 2200 5: 2200 6: 2200 7: 2201
8: 2200 9: 2200 10: 2200 11: 2200 12: 2201
Graphics: Device-1: Intel CoffeeLake-H GT2 [UHD Graphics 630] vendor: ASUSTeK driver: i915 v: kernel bus-ID: 00:02.0
chip-ID: 8086:3e9b class-ID: 0300
Device-2: NVIDIA GP106M [GeForce GTX 1060 Mobile] vendor: ASUSTeK driver: nvidia v: 470.63.01 bus-ID: 01:00.0
chip-ID: 10de:1c20 class-ID: 0300
Device-3: IMC Networks USB2.0 HD UVC WebCam type: USB driver: uvcvideo bus-ID: 1-11:3 chip-ID: 13d3:56a2
class-ID: 0e02 serial: <filter>
Display: server: X.Org 1.20.13 compositor: kwin_x11 driver: loaded: intel resolution: 1920x1080~60Hz s-dpi: 96
OpenGL: renderer: Mesa Intel UHD Graphics 630 (CFL GT2) v: 4.6 Mesa 21.2.1 direct render: Yes
Audio: Device-1: Intel Cannon Lake PCH cAVS vendor: ASUSTeK driver: sof-audio-pci-intel-cnl bus-ID: 00:1f.3
chip-ID: 8086:a348 class-ID: 0403
Device-2: NVIDIA GP106 High Definition Audio driver: snd_hda_intel v: kernel bus-ID: 01:00.1 chip-ID: 10de:10f1
class-ID: 0403
Sound Server-1: ALSA v: k5.14.4 running: yes
Sound Server-2: PulseAudio v: 15.0 running: yes
Sound Server-3: PipeWire v: 0.3.35 running: no
Network: Device-1: Intel Cannon Lake PCH CNVi WiFi driver: iwlwifi v: kernel port: 5000 bus-ID: 00:14.3 chip-ID: 8086:a370
class-ID: 0280
IF: wlan0 state: up mac: <filter>
Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: ASUSTeK driver: r8169 v: kernel port: 3000
bus-ID: 02:00.0 chip-ID: 10ec:8168 class-ID: 0200
IF: eth0 state: down mac: <filter>
IF-ID-1: tun0 state: unknown speed: 10 Mbps duplex: full mac: N/A
Bluetooth: Device-1: Intel type: USB driver: btusb v: 0.8 bus-ID: 1-14:4 chip-ID: 8087:0aaa class-ID: e001
Report: hciconfig ID: hci0 rfk-id: 1 state: up address: <filter> bt-v: 3.0 lmp-v: 5.1 sub-v: 100 hci-v: 5.1
rev: 100
RAID: Hardware-1: Intel 82801 Mobile SATA Controller [RAID mode] driver: ahci v: 3.0 port: 5060 bus-ID: 00:17.0
chip-ID: 8086.282a rev: 10 class-ID: 0104
Drives: Local Storage: total: 931.51 GiB used: 62.02 GiB (6.7%)
ID-1: /dev/sda vendor: Toshiba model: MQ04ABF100 size: 931.51 GiB speed: 6.0 Gb/s type: HDD rpm: 5400
serial: <filter> rev: 0J scheme: GPT
Partition: ID-1: / size: 884.14 GiB used: 62.01 GiB (7.0%) fs: ext4 dev: /dev/sda3
ID-2: /boot/efi size: 198.4 MiB used: 17 MiB (8.6%) fs: vfat dev: /dev/sda1
Swap: ID-1: swap-1 type: partition size: 32 GiB used: 0 KiB (0.0%) priority: -2 dev: /dev/sda2

Perhaps somebody has an advice, how to get some sound.