Multiple screen not working with windows 10 bootcamp

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Multiple screen not working with windows 10 bootcamp

I have recently installed Win10 on my Macbookpro-mid-2012. Secondary monitor works well when i use MacOS Catalina but doesnt work when i open Win10.

It uses Intel HD Graphics driver. I have tried following steps -

Updated Display Adapter driver
Windows support through Bootcamp
Some one suggested that at the startup just close the lid may bring the monitor screen - I tried this and initially screen gets activated on secondary monitor, then i choose my EFI drive. After the Windows Logo on secondary screen it starts showing “No Signal” on secondary monitor.

please help to make my secondary monitor work. Let me know if anyone needs any details.

MacBook Pro 13″, macOS 10.14

Posted on Jul 8, 2020 3:59 AM

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Answer 1

Top-ranking reply

Loner T

Level 9

59,513 points

Jul 13, 2020 2:59 PM in response to zieq

Can you test the following sequence? You will need an external USB Keyboard and Mouse.

Connect your monitor when in macOS and ensure you can see the display on etc external monitor
Shutdown your Mac
Connect the external USB Keyboard/Mouse
Reboot and hold Alt/Option on the external keyboard
Choose Windows and check if your external monitor works
If it does not, close the lid, and wait for a few seconds. Is the monitor detected
Does any external Keyboard/Mouse input allow the monitor to wake up

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Answer 2

zieq Author

Level 1

10 points

Jul 12, 2020 11:58 PM in response to Loner T

What is the physical connection between MBP and the secondary monitor?

What is the brand/model of your monitor?

Thunderbolt Mini Display Port[MBP] -> Mini Display Port [Monitor - LG 24GL600F ] Adapter

Adapter: https://www.amazon.in/AmazonBasics-Mini-DisplayPort-HDMI-Adapter/dp/B0134V3VZM/ref=sr_1_6?dchild=1&keywords=display%2Bport%2Bto%2Bdp%2Bcable&qid=1594623111&s=computers&sr=1-6&th=1

Monitor: https://www.amazon.in/LG-Ultragear-Gaming-Monitor-Freesync/dp/B07S146CB6

MacBook Pro 2012 - https://support.apple.com/kb/sp649?locale=en_IN

2.9GHz dual-core Intel Core i7 processor (Turbo Boost up to 3.6GHz) with 4MB L3 cache

8GB of 1600MHz DDR3 memory

Intel HD Graphics 4000

Thunderbolt digital video output

Native Mini DisplayPort output

I have currently

Windows10 Pro 64 Bit [Bootcamp 6.0]
Catalina MacOS

I have also tried in past with with Miniport [MBP] -> VGA Adapter -> VGA to VGA cable to Monitor [Dell p2214h]. This also doesnt work. Now I have bought this new LG 24GL600F Monitor and trying with DisplayPort or HDMI port but thats also not working.

Thanks

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Answer 3

zieq Author

Level 1

10 points

Jul 13, 2020 10:13 PM in response to Loner T

I have tried connecting to external mouse and keyboard that doesnt work either.
I have tried draining my battery and then restarting mac by default to windows, that also doesn't work. I am attaching the inages of sequeces of start
1. Windows Logo on External Monitor
2. Monitor went on “No Signal” mode

3. Window login screen on MBP

This doesnt work even Laptop Lid is down. This goes on No Signal even laptop lid is down.

Thanks

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Answer 4

zieq Author

Level 1

10 points

Jul 18, 2020 8:53 AM in response to Loner T

It works on MacOS but not on windows. I dont think that it is due due long wire issues.

I have also tried with

miniDp to VGA
miniDp to Hdmi

I have tried with above adapters. It doesnt work in windows but works in macos. Do you have any other suggestions?

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Answer 5

Loner T

Level 9

59,513 points

Jul 13, 2020 10:54 AM in response to zieq

Are you connecting the external monitor, after Windows is already up and running?

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Answer 6

zieq Author

Level 1

10 points

Jul 11, 2020 7:51 AM in response to Loner T

First of all Thank you. I saw your responses had helped multiple people on their questions.

Sorry, what do you mean by cold boot? If you can tell me then I can try those steps.

Monitor works when i just power on and then close the MBP lid. It works till windows logo then display gets switched to MBP.

Display properties in windows always show extra monitor and I move my mouse it shows like its going to another screen but external screen shows “No Signal” just after windows logo and before login screen.

Thanks again!

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Answer 7

Loner T

Level 9

59,513 points

Jul 18, 2020 9:50 AM in response to zieq

zieq wrote:

If I don't see this fixing then I will have to scrap my macbook pro and buy a windows laptop for sure :-)

That is unnecessary expense. Since the Windows logo does show up, the physical connection may be fine. The devices drivers are not detecting the monitor. Also, your Mac does not allow 'hot-plugging' TB devices, but this is a DP device. Let me also check. I have a 2013 MBP, which also has a similar setup. I have not run into any issues with it, but it runs W7.

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