QT interface got a problem with HDR screen in fullscreen

Hello QT suppoprt,

First : your site isn't user friendly, I'm not a developer just a single user who run on a problem which QT seems to be the damn problem, and the application forums said I should contact you since I'm the only person to report this problem to them.

So, the problem is this : QT interface mess up with Windows HDR luminosity setting when leaving fullscreen

Deatailled problem : I'm using programs (emulators like PCSX2 or Duckstation) which are using QT interface, after using them in FULLSCREEN mode and leaving the fullscreen mode the problem occurs, when it leaves the fullscreen it completely mess up with Windows HDR luminosity setting, as if the setting what set to 0, I need to go into Windows HDR settings to refresh it (clicking on it as if I wanted to change the the setting) or disconnect user and reconnect (or restart computer), and doing this is quickly boring. Sometimes if it even seems to disactivate HDR purely and simply (if I let the Windows Parameters window open it seems). And PCSX2 was still running QT and Wx interface at the same time and no problem the Wx interface so QT is more suspicious to me and it's not only happening with PCSX2.

All I know is that these programs are/were using QT interface 5 and 6 (as I said I'm not a developer and I'm not even sure I chose the good project to report bug), my Windows 11 is up to date, my RTX 2060 drivers too, my screen is an LG 29WK600-W connected in Display Port.

For me everything seems to point to QT hating fullscreen mode. Thanks for any help to report this bug.

Edit :

After more tests (because i changed my GC for an Intel Arc) I got more precisions on the problem :

• using DX11-12 : I don't have any problem, I can go/leave the fullscreen the luminosity won't get altered
• using OpenGL : the screen gets dark after I leave the fullscreen, but luminosity gets back to normal after closing the application
• using Vulkan : the screen get dark after leaving fullscreen, closing the app don't change a thing I need go bad in Windows Parameters > Screen > HDR to correct the luminosity

It's a problem if Vulkan and OpenGL can't render correctly HDR setting correclty on Qt. I hope it will help you to solve that problem for good.