529      iPhone_iPad_Mac_apple

Sierra/External monitor via DisplayPort/"No sig...

Since installing MacOS Sierra, I've had major issues with my external monitor (ACER G227HU), which is connected via MiniDisplayPort-to-DisplayPort cable (no dongle) to my early 2011 13" MacBook Pro (which is itself in clamshell mode).

Basically every time after going to sleep, the monitor wakes up together with the computer, meaning that the little light next to the monitor's power key turns blue, but then there is never any image, and after a few seconds the monitor just displays "NO SIGNAL".

Sometimes I can get the monitor to work again by unplugging and replugging the cable, sometimes only after opening the MBP (which is a pain because it sits vertically in a stand 1 meter away), and sometimes I actually need to restart the computer.

Something else I've noticed is that DURING sleep, the monitor sometimes goes from being completely black (no backlight) to black backlight, displaying "NO SIGNAL" for a few seconds until it goes back to sleep.

What I've tried so far:

• install 10.12.1
• use another (newly bought) MiniDisplayPort to DisplayPort cable
• adjust "energy" times in system preferences so there is no conflict between screensaver, display off and computer off
• reset NVRAM
• reset SMC
• used an HDMI cable instead - this seems to work, but then the Acer monitor won't work in the monitor's default resolution (2560*1440) because HDMI doesn't seem to be able to go that high

Would anyone know what this could be/how to fix it? Happy to upload logs, just let me know what you need exactly and how to find them ;-)

Thanks!

kkraemer

I'm experiencing a similar issue, after Sierra my external monitor only works after sleep if I restart the machine... Not fun at all. I'll disable sleep altogether until I find a solution...

I have this problem to with an A1286 2011 17" MacBook Pro after Sierra.  I also did everything kkraemer.  Some additional info to add...

• It's not just a problem after sleep mode.  The problem can be repeated by simply powering off and on the external monitor. Signal will now be lost from the thunderbolt display port and will not recover without a restart.
• Sometimes a restart will not work.
• Unchecking the "Automatic Graphics switching" option in the Energy Saver seemed to help for awhile.  Then the problem came back again in a couple of days.

I have a MacMini and MacBook Pro. 

The Mini, which is brand new (purchased in August 2017 - manufactured late 2014) is an absolute disaster for going into sleep mode.  Using it with an LG27MP55 which works well with the MacBook Pro as a second display. 

The screen simply doesn't get a signal; from the mini once it's in sleep mode.  I really need a solution to this, or the Mini is going back to Apple.

The MacBook Pro (mid 2013) doesn't have the issue - I'm running El Capitan 10.11.6

最後更新：2017-09-18 18:11:47

  上一篇： sierra dock text highlight

  下一篇： what is this folder for?  rrlofzokdxkz