[Bug 111416] 4k 60hz on RX 560 over HDMI = no sound

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Comment # 6 on bug 111416 from
Hi, based on your comment I went and plugged my nvidia machine into the TV
using the same cable and port. I then used xvidtune -show to extract the
modeline it was using: "3840x2160"   593.41   3840 4016 4104 4400   2160 2168
2178 2250 +hsync +vsync

I applied that modeline to the machine with the RX 560 in it, and still no
sound. However, I made a weird discovery while switching the cable between the
two machines. If I switch to 4k 60hz on the RX 560, then I pull the HDMI cable
out, and plug it back in again, I get sound at 4k 60hz. So that works as a
workaround. If I reboot, no sound again.

I have elimniated pulseaudio as a possibility by running

pasuspender -- speaker-test --nloops=1 --channels=2 --test=wav --device=hw:1,9

At 30hz, it works, at 60hz, it doesn't (Unless I replug the cable, then it
does)

I am attaching new dmesg and Xorg logs. Booting at 60hz (and thus having no
sound) and then replugging the HDMI cable (which gets me sound)

I can also simply turn my TV off and on again instead of unplugging /
replugging the cable, sound also works if I boot the computer with the TV off,
and then turn the TV on after X has started.


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