They did fix that a while ago though?

TV manufacturers are part of the cartel HDMI forum, which benefits from there being a big ecosystem of non-member devices that are forced to have HDMI ln them and pay licensing fees for it.

does X11 support actually measuring and calibrating colour?

To the same level that Wayland does - it doesn’t actively do anything for or against it. There are tools that happen to be built for X11, and which you can also use on Wayland (with a very small amount of additional manual steps vs. how it works on X11)

You can’t. Apps need to support shortcuts in order to receive them…

For Discord, the X11 compatibility page has working options though.

Umm yes, they did take ages to support it. It took like 7 years…

It was implemented over two years ago.

Do motherboard/monitor/IC/etc manufactures need to submit their own kernel patches well in advance of product releases, like what AMD and Intel do for their CPUs and GPUs? Are we just waiting for them to give a shit?

Yes. There isn’t really any other good solution.

Why does Nvidia need to support night light?

They don’t, but they needed to support the KMS API for applying lookup tables to the image sent to the screen - desktops relied on that functionality without a fallback, so when it wasn’t available, you just didn’t get the feature.

Can’t someone from Wayland just write a simple shader in any shader language that does colour adjustments and apply it to the desktop?

There’s no such thing as “someone from Wayland”, just the developers of the DEs (well, the project is named after a town, but I’m sure that’s not what you meant).

But, yes, you can use a shader. We implemented that in KWin and we’re using it when the driver or hardware doesn’t support the functionality we need… but that has a noticeable performance impact, so it’s still necessary for the driver to support it natively.

That’s not right. Most monitors use 8 bits per color / 24 bits per pixel, though some are still using 6 bpc / 18bpp.

HDR doesn’t mean or really require more than 8bpc, it’s more complicated than that. To skip all the complicated details, it means more brightness, more contrast and better colors, and it makes a big difference for OLED displays especially.

You could also try using KDE Plasma instead of Gnome, which survives GPU resets.

Okay, then the driver doesn’t allow Plasma to turn it on for some reason. You can report that at https://gitlab.freedesktop.org/drm/i915/kernel/-/issues, maybe someone from Intel can help.

No I can’t move my mouse to the external monitor.

Do you mean that it stays on the internal display, or that it doesn’t show up on the external one?

Or to ask it differently, can you move a window where the monitor should be?

My laptop detects the monitor correctly so it shows up in the KDE plasma display configuration but the monitor is not getting any input.

So the system thinks it’s enabled? Can you move the mouse cursor to it?

It’s an Electron problem, yes. The API is there, just waiting to be used.

I understand that it’s an absolute brightness standard, not like the relative levels in SDR

The standard is also relative brightness actually, though displays (luckily) don’t implement it that way.

why does it end up washing out colors unless I amplify them in kwin? Is just the brightness absolute in nits, but not the color?

It depends. You might

• have a driver bug. Right now only AMD has correct color space communication with the display, that doesn’t work correctly on Intel and NVidia yet
• have a display that does a terrible job at mapping the rec.2020 color space to the display
• be just used to the oversaturated colors you get with the display in SDR mode

Why does my screen block the brightness control in HDR mode but not contrast?

Because displays are stupid, don’t assume there’s always a logical reason behind what display manufacturers do. Mine only blocks the brightness setting through DDC/CI, but not through the monitor OSD…

Why is my average emission capped at 270nits, that seems ridiculously low even for normal SDR screens as comparison

OLED simply gets very hot when you make it bright over the whole area, the display technology is inherently limited when it comes to high brightness on big displays