Mixing 24 bits and 30 bits depth on K4200

Hi,

I’m wondering if it’s possible to mix 24 and 30 bits configuration for display devices. I’ve made some tests, but I never succeeded to make it work, my x server simply doesn’t start.
I also did the test with 2 graphic cards (with and without Xinerama), but it’s the same.
Our problem is that we would like to use 30 bits HDR display for rendering/compositing applications and a 24 bits for other apps.
We’re using Mate desktop, and some apps are badly rendered (framebuffer bits aligment issue, I guess) in 30bits mode.
Is there any documentation about this issue ?

Best regards

https://devtalk.nvidia.com/default/topic/994051/linux/24-bit-visuals-on-a-30-bit-display/post/5085539/#5085539
I don’t think much has changed since then.