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<
mps >
or I don't understand CTM term
07:40
<
chadmed >
there are two ways to modify the colour temperature - using a colour transformation matrix (CTM) or by using a LUT blob mapped to GAMMA_LUT
07:42
<
chadmed >
when passed to the crtc it is interpreted as a drm_color_lut[4] i believe and so is effectively also a CTM in disguise
07:47
<
mps >
hm, then CTM could mean two things: colour transformation matrix and colour temperature management, iiuc (english is not my native language)
08:06
<
chadmed >
the former in this context
08:13
<
mps >
and there is not yet it for asahi?
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chadmed >
no no we support it, but xorg doesnt
08:24
<
chadmed >
xorg only supports gamma_lut
08:28
<
mps >
aha. and asahi doesn't support gamma_lut iiuc?
08:42
<
chadmed >
yeah not yet
08:42
<
mps >
two of my chromebooks (maybe also old one, didn't tested) support 'however it is called set color temperature' with xorg for few years
08:42
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chadmed >
i do find it a bit silly that basically nothing supports the drm CTM api even in 2024 but it is what it is i guess
08:42
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chadmed >
kde night light got support in plasma 5.24 or something like that
08:43
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mps >
yes, I tested with plasma and it works but IIRC I used it in 'wayland mode'
08:44
<
mps >
not sure it will work in 'xorg mode'
08:45
<
j`ey >
chadmed: I guess because other drivers support GAMMA_LUT..
08:50
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chadmed >
drm drivers reporting drm_gamma_lut implementation are in the minority
08:51
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chadmed >
it just so happens that the ones that do are all the ones used on the PC ;)
08:53
<
j`ey >
if we eventually supprt gamma_lut too, theres even less reason for people to support ctm..
08:53
<
mps >
chadmed: I don't know anything about subject but my two chromebooks where this works are arm64, samsung (rk3399) and acer (mt8173)
08:58
<
leio >
they have all the need to support CTM to handle HDR iirc
09:10
<
leio >
I mean, if they really want to handle it properly with sRGB normal windows combined with other things
09:10
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leio >
but maybe only GNOME (and KDE?) is into that?
09:11
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leio >
but maybe I'm mistaken; but night light in combination with HDR I bet surely?
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