Comment # 6
on bug 111416
from Alfie Day
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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