有些筆電接HDMI無法投影 接D-SUB卻正常

 近期買的筆電在用HDMI連接會議室投影機時，都會顯示沒有連接到設備，接D-SUB卻正常投影。其他舊筆電兩種連接方式都正常。

本來以為是中間有連接一些轉接頭的關係，後來才發現，是因為新筆電解析度很高，但投影機的太低，如果接上投影機時，是在"同步顯示"的狀態下，投影機的畫面就無法投影，要改成"僅第二個螢幕顯示"，或是把筆電的解析度降低，就可以正常投影了。

Recently purchased laptops using HDMI to connect to the projector will display "No device connected". D-SUB can be connected normally. Other old laptops can connect normally in both ways.

At first, I thought it was because of the adapters in the middle. Later, I found out that it was because the new laptop has a high resolution, while the projector is old and has a low resolution. If the projector is connected in "Synced display" mode, the projector's image cannot be projected. You need to change to "Only second monitor display" or lower the laptop's resolution to be able to project normally.