I can't get rendering intent to work, any ideas please? -Progress **

I’ve tried RT’s RTv4_sRGB.icc profile and Elle’s sRGB-elle-V2-g10 profile in dt and neither produce jpegs showing any difference across the rendering intents. Nor the display setting.

AND RT5.8 is also failing on my system (Ubuntu 18.04) to deliver rendering intents.

Any ideas please!