Question

8

Dual Monitor problems - Screen Flicker and Offset

rated 0 times [ 8] [ 0] / answers: 1 / hits: 14669 / 2 Years ago, tue, may 3, 2022, 4:25:08

I have just installed Ubuntu on a Dell Inspiron 15. I'm using an AMD Radeon HD 7730M with the latest beta drivers installed. Whenever I try to plug in a dual monitor I get incredibly bad screen flicker and my launch bar is displayed in the middle of my screen, but still responds as if it were on the left at it's normal position. See this image.

Any idea what's causing this? Could it be the beta drivers? Have I not set something up correctly?

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ongdiligenc

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answered 2 Years ago etzelmortg · Accepted Answer

Figured the problem. Hopefully this can help someone. I never mentioned in my question that I was using a hybrid graphics set up with a 7730 AND an Intel 4000. When you plug in a separate monitor you get a mad flickering action going on. A temporary solution someone found is listed here.

This worked a treat initially, however when I opened the display options and moved my external monitor to the right hand side of my laptop screen that's when the problem happened. I looked at the command I used to stop the initial screen flickering:

xrandr --output VGA1 --auto --left-of LVDS1 --output VGA1 --scale 1.0001x1.0001

I noticed the bit that said --left-of. This would be fine if the monitor was to the left of the main display but it no longer is! Your command should simply be

xrandr --output VGA1 --auto --right-of LVDS1 --output VGA1 --scale 1.0001x1.0001

and everything should be working fine.