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Dual screen monitor flickering

X230 and later series specific matters only
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elfi
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Joined: Sun Jan 28, 2018 10:21 am
Location: Paris, France

Dual screen monitor flickering

#1 Post by elfi » Tue Jul 31, 2018 1:27 pm

Hi,

I'm using a Thinkpad X230 (Core i5-3360M and Intel HD Graphics 4000) on a dock with two 1680*1050 external VGA monitors. My OS is Ubuntu 18.04.

Via the dock, I connect first monitor one through DisplayPort (via VGA adaptator) and second one through VGA. As you can see on this video, the second VGA external screen is flickering around every 1-2 seconds. Interesting point : the flickering is not black but multicolor flickering…

https://streamable.com/2jeyq

Where does this flickering comes from ? Is it hardware of software ?

Thanks for your help !

dr_st
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Re: Dual screen monitor flickering

#2 Post by dr_st » Tue Jul 31, 2018 2:01 pm

It can be a software problem or a hardware problem with Thinkpad or dock. Very unlikely that it's a monitor problem.

Does it flicker when you connect only that one monitor through the VGA on the dock? Does it flicker when you connect directly to the laptop VGA (when the laptop is undocked)?
Thinkpad 25 (20K7), X1 Carbon (20HQ), Yoga 14 (20FY), T430s (IPS FHD + Classic Keyboard), X220 4291-4BG, X61 7673-V2V
T60 2007-QPG, T42 2373-F7G, X32 (IPS Screen), A31p w/ Ultrabay Numpad, A21m 2628-GXU

elfi
Posts: 5
Joined: Sun Jan 28, 2018 10:21 am
Location: Paris, France

Re: Dual screen monitor flickering

#3 Post by elfi » Tue Jul 31, 2018 3:58 pm

It does not flicker when I connect only that one monitor through the VGA on the dock. It does not flicker when I connect only that one monitor to the laptop VGA.

And it does not flicker when I duplicate screen (same image on both monitor).

dr_st
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Re: Dual screen monitor flickering

#4 Post by dr_st » Tue Jul 31, 2018 4:26 pm

If you can obtain a miniDP to VGA adapter, I would try another test - connecting both monitors to the X230 directly, via VGA and miniDP-to-VGA, and extending the desktop.

Also, try to see if a different operating system behaves differently.
Thinkpad 25 (20K7), X1 Carbon (20HQ), Yoga 14 (20FY), T430s (IPS FHD + Classic Keyboard), X220 4291-4BG, X61 7673-V2V
T60 2007-QPG, T42 2373-F7G, X32 (IPS Screen), A31p w/ Ultrabay Numpad, A21m 2628-GXU

elfi
Posts: 5
Joined: Sun Jan 28, 2018 10:21 am
Location: Paris, France

Re: Dual screen monitor flickering

#5 Post by elfi » Thu Aug 02, 2018 6:31 pm

Same result with no dock and miniDP.

When I use Windows 10, I have no flickering ! So, the problem comes from my Linux…

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