How to get rid of flickering / rippling external monitor?

avalak2012-10-23 13:23:38

linux

avalak, 2012-10-23 13:23:38

Issue: Abnormal nasty ripples on external monitor. Horizontal, light, blurry, flickering areas.
Monitor: 20 "1600x900. has d-sub / vga. dvi (acquired yesterday. new. working)
Laptop: acer 2920 (~ 2008. worthily serves faithfully for which it receives updates). has d-sub / vga, s-video
How the monitor is connected: via the cable from the kit.vga-vga.Native
laptop screen shows perfectly.Tried
to update packages (Ubuntu), set up the monitor ( www.techmind.org/lcd/phasing.html, www.lagom.nl/ lcd-test/all_tests.php are displayed correctly.)
I tried to connect to a netbook (the same conditions): the picture is perfect, there are no flickering / ripples.
I tried running Win XP (I can't guarantee that all the necessary and fresh drivers were there). There was a ripple.
How to get rid of it?

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18 answer(s)

Ivan85, 2013-05-28
@Ivan85

I'm tired of this flicker!
He approached the solution of the problem in a complex way, having collected everything that was needed on the Internet. Flicker has been reduced to the minimum acceptable level. The solution to the problem is crooked, even if you complete all the points.
1) We spread all the wires and devices in space as much as possible (the farther apart the better). But not less than 1.5-2 meters.
2) We connect the laptop and the monitor to different sockets.
3) We install the monitor via UPS, a laptop without UPS or vice versa (if UPS is available).
4) We wrap all the wires and the power supply with foil to shield interference.
5) We set the resolution in the screen settings to not 60 Hz (75 is possible).
6) If it still flickers on a particular monitor, try another monitor - in my case it helped to further reduce flickering. If you buy a new one, it's better to immediately with HDMI and DVI outputs - if you have the appropriate ports in your laptop, you can cancel all the perversions listed (foil, UPS, etc.)
7) Experimenting with screen resolutions - perhaps flickering is less noticeable on some resolutions.
8) We adjust the colors on the monitor - with a certain combination of colors, the flicker is less noticeable.
9) Be sure to auto-configure the monitor (usually there is such a button on the monitor).
10) If possible, we extend the cable for the laptop, and the part that comes from the UPS is preferably up to five meters and we take the power supply as far as possible. You can try to buy several power supplies and experimentally choose the most optimal one.
11) They say it's better to use a short VGA wire with ferrite rings (you can additionally wrap it with foil) - but in my case it did not help. It is better when there are several different VGA wires - we select the optimal one experimentally.
12) As the most moronic option, you can change the laptop - but I will not consider it - I have the most convenient laptop in the world, albeit without a DVI connector.
The problem with monitor flickering when connected to a laptop is serious and it must be solved in a comprehensive manner, using all possible resources. Flicker reduction per proven is worth fighting for!
In order not to run on a laptop battery and, accordingly, not wear it out - as an option, you can buy a UPS, turn off the beeping in the settings, work only from UPS, when we go on a smoke break, plug the uninterruptible power cord into a power outlet. Although it's probably easier to buy a monitor with the right connectors (HDMI, etc.)

charliez, 2012-10-23
@charliez

I had this, the replacement of the DVI cable helped.

BasilioCat, 2012-10-23
@BasilioCat

I had a similar picture while the laptop was plugged into the outlet. It was best seen on a gray background. If you turn it off (on batteries), it disappears. It is globally solved by replacing it with DVI (the ripple disappears completely) or by turning the monitor into network filters (two helped me, the ripple noticeably decreased, but not completely disappeared). Options are possible with sticking both the monitor and the laptop, or only the monitor or only the laptop into the filter, try

Ivnika, 2012-10-23
@Ivnika

Use a d-sub cable
in the settings to set a different frequency

Diam0n, 2012-10-23
@Diam0n

D-sub cable (also called vga) uses an analog signal. Obviously there is an EMI source near the cable. try flipping the ends of the cable, or, more effectively, purchase a quality cable.
Also, it is possible to reduce interference by reducing the screen resolution. Because the amount of data will decrease, and the effect of noise on the picture will decrease accordingly.

65520, 2012-10-23
@65520

Buy a good VGA cable. The shorter, the better.

stasomsk, 2016-01-28
@stasomsk

Colleagues, thank you very much for your advice. It helped to get rid of the ripples by connecting the laptop and the monitor to different sockets.

slarionoff, 2012-10-23
@slarionoff

Naturally, did you auto-tune the monitor?

xdenser, 2012-10-23
@xdenser

Is the laptop's VGA output really working? Maybe the problem is in it? Have you tried with a different display?

Georgy Khromchenko, 2012-10-24
@Mox

Change the laptop to another one with a digital output

Alexander Lebedev, 2012-10-24
@cawaleb

As we wrote earlier, the flicker is most likely due to the high vga frequency on the laptop, if the computer is not used for games, order a usb video card and get rid of the flicker.

Ivan85, 2013-05-28
@Ivan85

It is treated with the maximum separation from each other of the power supply for the laptop, laptop, wires for the monitor and the monitor itself (in my case, everything is separated by more than one and a half meters), and not completely, but you can already work more or less comfortably.

cyberdream, 2013-05-30
@cyberdream

Instead of a VGA (D-Sub) cable, I connected it via Dvi=>Hdmi, the ripples disappeared. when disconnecting the laptop from the network, it also disappeared. Thanks for the info!

Alexey, 2014-10-03
@Demanoidos

All flickering problems are solved by an HDMI cable. The flicker disappears completely, since the signal is digital and it is not subject to electromagnetic interference generated by power supplies of devices. In addition, its length can be up to 10 meters, very convenient.
You only need to specify later in the laptop sound playback devices (in the OS settings) that the sound should be sent to the speakers / headphones, and to the monitor, via an HDMI cable :-)

dogmator, 2015-11-15
@dogmator

The same problem.
My observation boils down to the fact that if you pull out the power supply from the laptop, the flickering disappears completely. So the problem is in the power supply.
Replaced the power supply and the ripples disappeared completely.

Leqwiser, 2016-12-26
@LeqWiser

+1. It helped by connecting the monitor and the power supply to different sockets. Well, I changed the ends.

HabrhabrEU, 2020-04-27
@HabrhabrEU

There is a problem with flickering (light and purple dots blink in different places, in groups) of an external monitor - most noticeable on a black background
Connected via HDMI
It does not depend on whether the laptop is connected to the network or not
What could be the problem?
Driver itself demolished

Valera Boldarev @Valera, 2021-10-22
Boldarev

I have a flickering external monitor connected to the laptop when the laptop is charging.
The laptop and monitor are connected to the same outlet and connected by a VGA cable. flickering disappears when charging is turned off