Some users on this forum are reporting issues with the CAC-1085 adapter and recent drivers from nVidia. It would be interesting to know if this is common, and what cards does it happen with.
The reason for this is, after spending last night trying to enable 120Hz in Linux with the most recent driver from nVidia (460.32.03), I stumbled across this error in my logs related to 3840×[email protected] (reported by the driver, apparently):
[ 2358.878] (WW) NVIDIA(GPU-0): Mode is rejected: DP Bandwidth check failed.
[ 2358.878] (WW) NVIDIA(GPU-0): GPU extended capability check failed.
The question is, why does the bandwidth check fail? Does the driver fail to negotiate with the device because it ignores that the adapter is using DSC (without which the bandwidth would probably be insuffcient)? Can this be affected with firmware or is it a 100% nVidia thing? I’m not familiar enough with the subject, but hopefully someone is 😀
And does this affect all nVidia users trying to use resolution/refresh/bit depth combinations with “too high” bandwidth requirements through the adapter?
I’m using the adapter with a Asus Strix 2080Ti, and can not enable these settings.
A working solution to this would be great, with the lack on any actual availability of modern GPUs.