[kuschku]

> This could be output encoder specific; I'm not aware of such limitation, so I'm looking into Intel docs now (TGL ones, volume 12: Display Engine), cannot find any mention of it. Would you have any pointers?

> Or do you mean specifically GPU (texture) scaling? I'm not that familiar with GPU part, but I would be surprised if that was true, when the hardware today considers LUTs for the buffers.

To scale in linear RGB colorspace, you first need to do a colorspace transform on the entire buffer, then scale, then do another colorspace transform. I can't find any device that does this in a single step correctly, except for some rare GPU extensions.

[vetinari]

To quote the Intel docs:

> Plane scaling is [sic] supports both linear and non-linear scaling modes. The scaling mode is programmed in the PS_CTRL. In HDR mode, scaling and blending operations are generally performed in linear mode.

To be limited to sRGB would mean, that the hardware is pretty much limited to SDR. That would make it unusable in mainstream market today; just good enough for low-end SBCs.