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5 Posts

03-01-2021

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T490- when docked and lid closed, external monitors glitch out

2021-04-13, 19:59 PM

Thought of putting this in accessories forum but pretty sure its a laptop problem.  T490 originally docked on Think Pad Ultra 40AJ, 1/2 external screens glitch out with the laptop lid closed.

 

Ran all Lenovo and windows updates available, including dock firmware. Tried my own laptop (t480s) on same dock and do not get the problem.

 

Swapped out the docks to see, now the t490 is on a USB-C Dock Gen2, and the issue persists. When the lid is opened, the screens behave normally (with slight background jitter). When the lid is closed, one external goes wild with jittering, documents are barely readable. When you connect the dock and the desktop icons are moving to the external screens, they turn bright green for a bit. Video Card? just so weird that it works well with all three screens up (lid open), but doesnt work with the lid closed.

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3619 Posts

08-02-2018

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Re:T490- when docked and lid closed, external monitors glitch out

2021-04-14, 8:31 AM

Hi SiraIT!


Greetings


Just to clarify, does the external screen goes in half? Have you tried setting what the lid does when it's closed to do nothing?

 

Can you try installing the Thunderbolt driver first then the firmware after. You can get it here: https://support.lenovo.com/us/en/solutions/ht508988

 

Update us how it goes

 

 

Jwes_Lenovo



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5 Posts

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Re:T490- when docked and lid closed, external monitors glitch out

2021-04-14, 13:13 PM

Thank you JWes! I will give it a try. I sort of assumed the lid was set to do nothing, but didn't consider checking that! Also- I meant that 1 out of 2 of the external monitors glitches out. The second screen behaves relatively normal with some slight jittering, but the entire first screen jitters like crazy. I have another appt with the user on Thursday, I'll let you know how it goes! 

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3619 Posts

08-02-2018

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Re:T490- when docked and lid closed, external monitors glitch out

2021-04-14, 16:25 PM

I see. Feel free to get back to us whenever you're available.

 


Jwes_Lenovo



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Re:T490- when docked and lid closed, external monitors glitch out

2021-04-15, 17:25 PM

Hey JWes, thanks for your suggestions. I ended up doing the TB driver and firmware, but the issue persisted. Then in Windows, I switched the monitor in question to the incorrect resolution, and back to the correct. That stopped the glitching -_- .  One of those dumb fluke things I guess. Thanks for your help!

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3619 Posts

08-02-2018

United States of America

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Re:T490- when docked and lid closed, external monitors glitch out

2021-04-15, 20:43 PM


I see. Good to hear that the issue has been fixed.


Cheers!

 

 


Jwes_Lenovo



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