[GTR9 Pro] Which port shows BIOS/POST when both HDMI and DP are connected? 有中文

pl6

[GTR9 Pro] Which port shows BIOS/POST when both HDMI and DP are connected?

I have a GTR9 Pro (Ryzen AI Max+ 395). I plan to connect HDMI 2.1 to a TV and DP 2.1 to an MST hub, with an IP-KVM on one of the hub’s outputs. I rely on the KVM for BIOS access and watching the boot process, so I’d like to confirm a few things. If anyone has tested this, I’d really appreciate your input:

With both HDMI and DP connected, does the POST screen / BIOS setup show on both ports at the same time (mirrored), or only on one? If only one, is it always HDMI, always DP, or is there some priority rule?
Is there a BIOS option to choose the primary display output (which port the boot screen uses)?
When the DP port is connected to an MST hub (1-to-2 split), does the BIOS/POST screen show on the displays behind the hub? If so, on the first output only, on all outputs, or not at all?

Thanks!

【GTR9 Pro】HDMI 和 DP 同时接显示器时，BIOS/开机画面出在哪个口？

我的机器是 GTR9 Pro（AI Max+ 395），打算 HDMI 2.1 接电视、DP 2.1 接一个 MST 扩展坞，扩展坞下面挂一台 KVM。平时进 BIOS、看开机过程都要靠这台 KVM，所以想先确认几件事，有实测过的朋友麻烦说一下：

HDMI 和 DP 同时接着显示器时，开机 logo 和 BIOS 设置界面是两个口同时显示，还是只出在其中一个口？如果只出在一个口，是固定 HDMI、固定 DP，还是有什么优先级规则？
BIOS 里有没有设置主显示输出（开机画面走哪个口）的选项？
DP 口接 MST 扩展坞（一分二）的时候，BIOS 和开机画面能不能在扩展坞后面的显示器上出来？会出在第一个口、所有口，还是都不出？

谢谢！

Beelink CS-Ian Chan

pl6 Hi , There

When monitors are connected to both ports at the same time, the boot logo and BIOS screen will typically only appear on one port. The other display will turn on only after entering the OS. You may test this behavior.
Please enter BIOS and navigate to Advanced → AMD CBS → NBIO Common Options → GFX Configuration to check whether the Primary Display option exists.
If there is no Primary Display setting, this item cannot be adjusted within BIOS.
When a DP MST docking station (1-to-2 splitter) is used, the BIOS and boot screen will most likely fail to display . Boot-stage support for docking stations is limited.
We recommend unplugging the docking station and using direct HDMI/DP connections when accessing BIOS or viewing the boot logo. You may reconnect the docking station for multi-monitor setup after booting into Windows.
Impact for KVM switches: The boot screen will only work over a directly connected HDMI or DP cable. Displays via the docking station will not show output during the BIOS phase.