https://forums.anandtech.com/threads/asus-pb278q-monitor-loses-displayport-signal.2286097/ 你看下这里的办法有没有能解决你的问题, I own three displayport cables. One of them refuses to work with my monitor. The second one works half of the time. It will sometimes work on cold and warm boots. The third cable works every time no matter what. 这个我也很无语的 2 楼的回答挺专业的 我笔记本 bios 没那么好搞,很多选项都被屏蔽了,你说不定照着设置一下能解决问题
2 楼是说了一下原理,中间有一楼说了 bios 里的睡眠方面的设置改一改有可能解决问题 There is a feature on newer motherboards in which they have sleep state settings outside the control of the operating system. Go into your bios and go to APM configuration. Look for ErP setting (default is usually disabled) and enable it to S4+S5 sleep state. This solved my problem, now my monitor will show a display after computer wakes up from sleep or when powered off.