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CRT Emudriver vulkan and interlaced resolution

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Dalba:
Hello,
After creating successfully an arcade cab with groovymame, i created console box using retroarch with native resolution switching and CRTEmudriver.
Some cores like flycast or parallel rely only on Vulkan backend. I ended up encountering a strange bug and i don't know if it's due to my setup or a bug affecting Vulkan.
So my setup :
- Win 10
- Radeon HD 7850
- Calamity's driver Adrenalin 18.5.1
- static modelines

As read in an other post, i follow Calamity's advice and install first latest official AMD radeon driver, and then CRTEmudriver without uninstalling official driver.
This way i get vulkan installed and a fully working 15khz output.

But ! If i try to use any emulator with vulkan backend in fullscreen with an interlaced resolution, i just get a black screen while sound is playing.
On the opposite, a progressive fullscreen resolution is working correctly with vulkan, like 256x224p or 320x240p.

Is anyone here able to use an interlaced resolution in fullscreen with vulkan ?
An easy test is to set desktop at 640x480i, and then launch a game with dolphin in fullscreen...
I really would know if i'm the only one facing this situation...

psakhis:
Yeah, i detected this some months ago but i think it's emulator issue selecting mode.

I have CEMU working fine with vulkan at 640x480i.

EDIT: anyway for Dolphin the better backend it's direct3d in Windows.

Dalba:
With Cemu you're using real exclusive fullscreen or windowed borderless ?
If so what is your config regarding graphic card and OS ?
Because in my case it's really a problem related to fullscreen vulkan in 480i whatever program or emulator i launch...

psakhis:
I don't know how Cemu implements fullscreen (exclusive vs borderless), in my setup fullscreen it's true....

But isn't relative to Vulkan only, for example on Redream happens too if you don't change at 480i before starts emulator on Opengl.

My setup is: W7x64, ATI HD7750.

Dalba:
So your card is the same generation as mine... How did you get vulkan working on your setup ?
Did you do as me and install first official drivers from AMD before installing CRTEmu drivers ?
When i launch an emulator in 480i, in fact my desktop is already in 480i too. I must have missed something somewhere...

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