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Can't access BIOS over DisplayPort when CSM is disabled

Molot
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I have quite a bizarre problem. I wanted to install Windows 11, so I disabled CSM, enabed Secure Boot and voila - everything works, except display before Windows stars. It works all right over HDMI, but it fails over DisplayPort. There's no output. Bios update tool didn't find a new BIOS version for my motherboard. I tested it, using HDMI to change settings, and Secure Boot doesn't matter, it depends solely on CSM setting.

 

Any ideas what can cause that issue? And how to maybe solve it? I bought HDMI cable to get things working but I am certainly not satisfied with this solution.

 

Motherboard: B550 AORUS PRO (rev. 1.0)

GPU: ASUS GeForce RTX 3070 Noctua OC Edition

CPU: AMD Ryzen™ 9 5900X Tray

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Why do you need CSM enabled? My GTX970 also wont display anything through DP if CSM is enabled.

mY s YsTeM iS Not pErfoRmInG aS gOOd As I sAW oN yOuTuBe. WhA t IS a GoOd FaN CuRVe??!!? wHat aRe tEh GoOd OvERclok SeTTinGS FoR My CaRd??
 HoW CaN I foRcE my GpU to uSe 1o0%? BuT WiLL i HaVE Bo0tllEnEcKs? RyZEN dOeS NoT peRfORm BetTer wItH HiGhER sPEED RaM!!dId i WiN teH SiLiCON LotTerrYyOu ShoUlD dEsHrOuD uR GPUmy SYstEm iS UNDerPerforMiNg iN WarzONEcan mY Pc Run WiNdOwS 11 ?woUld BaKInG MY GRaPHics card fIX it?
 MultimETeR TeSTiNG!! aMd'S GpU DrIvErS aRe as goOD aS NviDia's YOU SHoUlD oVERCloCk yOUR ramS To 5000C18

 

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It's the other way around. I need it disabled, but when it is disabled, display port does not work in bios setup.

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14 minutes ago, Molot said:

It's the other way around. I need it disabled, but when it is disabled, display port does not work in bios setup.

Remove displayport and HDMI from the PC. Power off PSU. Reset CMOS. Or remove CMOS battery for 5-10 min. Plug in displayport. Go to bios and set secure boot. CSM should be disabled by default.

CPU: i7 9700K@5ghz all core (silence + summer)

cache x47, AVX offset 0

Motherboard: Asus Maximus XI Hero

RAM: Patriot Viper Steel 2x8gb@3733mhz @jedec cl15

PSU: EVGA SuperNova 750 G3

Mon:  LG 27GL850-B, 144Hz Nano IPS - G-Sync compatible/Freesync

GPU: EVGA 1080ti SC Black Edition w/ G12 bracket

Sound: Odac + Fiio E09K

Case: Fractal Design R6 TG Blackout

Storage: MP510 960gb and 860 Evo 500gb

Cooling: CPU: Kraken X62 - GPU: Kraken X42(RIP) -> X53 (From RMA)

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