It's the same. I still have a linear 2.4 gamma and it's my problem. My JVC can't make a linear 2.4 gamma at low ires. And I absolutely don't want a 2.2 gamma in my dedicated projection room. A 2.4 gamma offer me a very high contrast, the picture looks like 3d. It's just perfect.
But in my case I have to start from 2.2, 2.3 @0 ire and 2.4 from 10 to 100ires to be able to have a perfect grayscale.
Lightspace offer tools for specify the gamma curve on 100 points:
"The Lightspace Custom Color Space Creator allows you to create custom color spaces with fully customizable gamut and gamma (including the new Lightspace parametric gamma controls).
These custom color spaces can be used in Lightspace within the Colour Space Conversion tool as a source for the LUT that is being created.
You can freely define the color space gamut and in addition, the new parametric gamma controls of Lightspace allow you to fully customize your gamma with up to 100 gamma adjustment points, which is a dramatic help for displays and projectors that struggle outputting a constant gamma.
As an example, you can create a custom color space with the common consumer Rec 709 gamut, use the common gamma of 2.2 as a starting point, and then make adjustments along the gamma curve to compensate for the display's gamma inconsistencies."
If dispcalgui could have a similar tool it would be fantastic but I think it's a lot of work for the developers.