ARC A750 Black Screen Flickering on DP with Multi Monitors DP+HDMI

[MilesPerByte]

Hi,

This is a bit of a strange issue and I've tried almost every single troubleshooting step to no avail. I have two 1080p monitors, 1 HDMI and 1 DP. On first boot, the HDMI monitor will display properly, however the DisplayPort monitor will black screen whenever there is a changing image on it. (Mouse movement, window movement, etc.) I can unplug the DisplayPort monitor and plug it back in and it will fix this issue, OR I can also unplug the non-affected HDMI monitor and plug it back in and it will fix the black screen on the completely unrelated DisplayPort monitor.

If I only have the DisplayPort monitor plugged in on first boot, it works fine. The black screens only appear when I have both the HDMI and DP monitors plugged in.

My other Nvidia cards work perfectly fine with both monitors plugged in. This seems to be a problem with the handshake between the ARC card and the monitors when the PC first boots up. As I turn off my PC every day, this is rather annoying, as every time I turn it on, I have to unplug one of the monitors and plug it back in to temporarily fix this issue.

Here's everything I've tried to no avail:

• Manually reflashing the firmware on the gpu with the files extracted from the latest driver version as of writing this: 32.0.101.6130 (Firmware, Data Oprom, Code Oprom, and Config)
• Using DDU in safe mode twice and reinstalling the latest drivers twice.
• Going into the BIOS and disabling iGPU multi monitor.
• Disabling/Enabling 4G decoding.
• Disabling the logo startup.
• Running both monitors at 60 Hz

Here's my PC configuration as-is to prevent any unnecessary troubleshooting steps:

• OS - Windows 11 23H2
• GPU - Intel ARC A750 Limited Edition
• CPU - Intel Core i7 12700k
• MOBO - MSI PRO Z790-P WiFi DDR4
• --
• Fast Boot is disabled in BIOS and Windows.
• Boots from UEFI
• ASPM is disabled

Here are the monitors I am using:

• DP - Sceptre IPS 24” Gaming Monitor (E248B-FPT168)
• HDMI - Samsung - 24" T350

I've temporarily worked around this by plugging my HDMI monitor into the HDMI port on my motherboard, so the 2nd monitor is using the iGPU via multi monitor support, but I'm lucky that I have that option. I should be able to plug both of my monitors into my GPU. This is probably a bug with the current vbios for the card.

Thanks for any help!

[MilesPerByte]

I still have this problem with the latest drivers... Can someone from intel get back to me pleeeease?

[ACarmona_Intel]

Hello MilesPerByte,

Thank you for posting in our communities.

Please allow me time to further investigate our issue. I'll get back to you as soon as I have an update on our case.

By the way, I appreciate your efforts for your detailed post.

Thank you!

Best regards,

Carmona A.

Intel Customer Support Technician

[MilesPerByte]

Sounds good! Looking forward to your reply!

[ACarmona_Intel]

Hello MilesPerByte, 

Thank you for patiently waiting on my response.

I'm done investigating our case, and I have sent you a message via email.

The content of that email is to address our concern, and I have also asked for some information that is best not to be viewed in public. Therefore, when you reply to me, please send it via email.

Thank you!

Best regards,

Carmona A.

Intel Customer Support Technician