[Pkg-utopia-maintainers] Bug#1025453: pipewire: Choppy sound via HDMI

[sb73542 at gmail.com]

I can confirm that this bug affects me in Bookworm + Pipewire with this hardware (and a DisplayPort->HDMI adapter):

================================================
System:
   Host: T440s Kernel: 6.1.0-13-amd64 arch: x86_64 bits: 64 Desktop: Cinnamon
     v: 5.6.8 Distro: Debian GNU/Linux 12 (bookworm)
Machine:
   Type: Laptop System: LENOVO product: 20AR006RUS v: ThinkPad T440s
   Mobo: LENOVO model: 20AR006RUS v: SDK0E50510 PRO
     UEFI: LENOVO v: GJETA4WW (2.54 )
     date: 03/27/2020
CPU:
   Info: dual core Intel Core i5-4300U [MT MCP] speed (MHz): avg: 805
     min/max: 800/2900
Graphics:
   Device-1: Intel Haswell-ULT Integrated Graphics driver: i915 v: kernel
   Device-2: Chicony Integrated Camera type: USB driver: uvcvideo
   Display: x11 server: X.Org v: 1.21.1.7 driver: X: loaded: modesetting
     unloaded: fbdev,vesa dri: crocus gpu: i915 resolution: 1366x768~60Hz
   API: OpenGL v: 4.6 Mesa 22.3.6 renderer: Mesa Intel HD Graphics 4400 (HSW
     GT2)
Network:
   Device-1: Intel Ethernet I218-LM driver: e1000e
   Device-2: Intel Wireless 7260 driver: iwlwifi
   Device-3: Intel Bluetooth wireless interface type: USB driver: btusb
================================================


I also tried the Backports 6.4 kernel with the same results.


The workaround suggested earlier in this report works:
> edit /etc/default/grub to add
> GRUB_CMDLINE_LINUX_DEFAULT="intel_iommu=on,igfx_off"


This is definitely a Debian issue, because openSUSE Tumbleweed + Pipewire on this same hardware does not have this bug.