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I have recently upgraded to Ubuntu 18.04, and I am experiencing subtle (but constant and rather annoying) screen flicker. My computer is an HP Envy x360 Convertible 15-bp1xx; using Intel graphics driver. The flickering is not specific to any application, but it is more visible in large medium-gray areas (e.g. applications with dark themes, desktop backgrounds, etc.)

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I just ran into the same issue. Was fixed by changing the refresh rate to 59.96 or 59.93 (it was on 60.01) - no clue why. Just opened display settings and fiddled around after reading much older posts on similar issues.

Hope this sorts it out for you!

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I had to edit my monitor config and change the framerate. By default mine was set to 60.169086456298828.

open terminal and run the following:

sudo gedit ~/.config/monitors.xml

edit this line:

<rate>60.169086456298828</rate>

set it to be lower than 60 as mentioned by 4levels, I used 59.96.

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