(11-30-2025 11:22 AM)EeK Wrote: Hi @ToastyX,
I’ve been using CRU for a long time (thanks for creating such an amazing tool) - initially to remove higher-than-4K resolutions from my LG OLED TVs.
I recently upgraded to a Samsung S90F OLED TV, which adds the issue of reporting incorrect audio formats (resulting in the loss of 7.1 surround and Atmos when the TV passes audio to my AVR via eARC).
Naturally, I used CRU to fix this and ran into the Nvidia driver behavior where EDID overrides are ignored when DSC is engaged. The S90F supports 3840×2160 @ 144 Hz only with DSC when using RGB Full 10-bit, so I limited it to 3840×2160 @ 120 Hz and added the necessary audio formats - these ones, copied from my Denon AVR-X4400H (the linked image is part of a tutorial I wrote for AVS Forum).
Everything worked perfectly except for Atmos. I always get 7.1, and the correct encoded formats (Dolby Digital Plus, Dolby TrueHD and Dolby Digital - Samsung doesn't support DTS formats) consistently appear under Supported Formats, but Dolby Atmos for Home Theater only showed up twice.
I was able to trigger Atmos only immediately after restarting the GPU driver following the EDID change, and once more after unplugging/re-plugging the HDMI cable. In both cases, the option disappeared again on the next reboot. I haven’t found a reliable way to make it reappear, and I don’t want to risk damaging the GPU’s HDMI port by repeatedly unplugging and reconnecting the cable.
Do you have any idea what might be causing this or know of any possible fixes/workarounds? I’d love to keep Atmos support without having to run a second HDMI cable from the GPU to the AVR and deal with all the complications of using a secondary display (including the other Nvidia bug mentioned in the OP).
Thanks in advance for your help.
P.S.: This is what my Speaker Setup looks like. I tried checking the box for "Top front left/right" (to match my 7.1.2 Atmos setup), but that didn't seem to make a difference. In fact, in the two instances that Dolby Atmos for Home Theater did show up and work, I had that box unchecked.
I don't know what's required for Atmos. The speaker setup is just informational and doesn't affect anything. If it's working inconsistently, that could indicate another driver bug, but I'm not sure how the driver is involved with this. By the way, the multi monitor driver bug might not happen with VRR disabled, so that's another option to try.
