08-01-2017 09:12 AM
I am using a brand new Lenovo P51 with 64-bit Windows 10 with a NVIDIA Quadro M1200 video card along with an external monitor (ASUS VS228H-P) connected through HDMI. When my computer goes to sleep, my second monitor turns off. When I wake up the laptop, but 2nd monitor is no longer recognized by the machine and I am unable to use the display. I have tried a number of solutions already:
1) I have tried selecting "extend display" under F7
2) I have tried using the detect display button in System/Display Settings
3) I have updated my drivers for both display adapaters (intel graphics 630, and NVIDIA Quadro M1200)
4) I have turned the monitor on and off,
5) I have cycled through the input options on the monitor while it is on
6) I have plugged and unplugged the HDMI cable
The only solution to reconnect the monitor I have found is to reboot the computer which is impractical for me while I am using the machine (I am running programs over multiple days and rebooting is not impossible). It is also impractical to turn off sleep mode on the machine - the whole point of having sleep mode is to save my screen and reduce power usage. I also use sleep mode for security - I want my laptop to lock so that someone can't just pick it up any time and use it. I also read somewhere that someone was able to turn off and then turn on the display adapters to reconnect - but this is a ridiculous fix I won't repeat over and over again.
Outside of these solutions, has anyone found a way to make Windows 10 recognize an external display?
I have also asked this question on the windows forum here: https://answers.microsoft.com/en-us/windows/forum/windows_10-hardware-winpc/2nd-monitor-will-not-wak...
11-06-2017 07:03 PM
IN a similar situation. Yoga Pro-2 with Win 10 and external ASUS VS247H-P monitor connected via HDMI. I have to turn the monitor off and back on after Yoga goes to sleep. The Lenovo thinks its on but the monitor is NOT on.Did you find any solution?
11-06-2017 07:52 PM
Have you tried using a different cable, specifically miniDP->HDMI instead of a straight HDMI->HDMI cable?
The miniDP connector supports an HDMI monitor, but works differently than the HDMI connector. Different handshake.
See if this makes any difference.
11-07-2017 08:25 AM
A different cable is an idea I haven't tried yet.
Since my original message, I've figured out that my monitor generally runs into handshake problems if I allow the computer to go to sleep with the monitor attached. My "fix" has been to turn off the 2nd montor if I am going ot walk away from the laptop.
In general I have concerns about the laptops video processor as well. It is hard to describe, but I have been getting weird patterns/salt pepper signals around my start menu which yesterday (for the first time) spread into the center of the display. A reboot fixed the problem - but it seems that sometimes there are problems with my display showing weird pixelations. I'm hoping its not my video card... I don't think it is a big enough of a problem yet to send in the laptop because I cannot consisently get the same error. I would expect Lenovo would look at it and decide nothing was wrong, and send it back.
06-27-2018 06:24 AM
P51 with NVIDIA M1200 in a 230W dock. 2nd external monitor will not wake after sleep. NVIDIA controller seems to think that the one working monitor is being controlled via both HDMI port and DP on the dock (looking in the NVIDIA control panel -> adjust resolution shows that the monitor is on the DP port, but the monitor only displays when selecting HDMI input). Unplugging either the DP or HDMI cables from the dock disables the one working external monitor. When I switch the cables around for the two monitors, on the back of the monitors themselves (not the dock), they both display again.
Tried updating drivers for both video controllers (Intel and NVIDIA) as well as rolling back; disabling the Generic PnP monitor in Device Manager (no effect). Disabling the NVIDIA controller does kill the one working monitor, but re-enabling only reactivates the one monitor. Log (Event Viewer) shows an 'failed to migrate...' for the high def NVIDIA audio. 'Ambiguous definition' or such.
So, at this point, it appears that the NVIDIA M1200 is not working with the P51 combatible dock - some kind of resource issue perhaps that does not refresh after wake. Seemed to start after a windows update (Windows 10).
Tried a different dock of the same model - no help. No resolution as of yet....