If you don’t want any problems when you use dedicated graphics card (AMD), you MUST use only the default display settings for your retina display (i.e. 1440x900, it may also be designated as 2880x1800 in your computer since it’s quadrupled by using factor 2x2 for each figure, due to “retina” specification).
You can use “more space” or “larger text” options in Mac’s own display settings '''''only when you switch off''''' the dedicated graphics card.
Hope this helps.
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=== Update (12/02/2018) ===
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I can add one more additional thing to resolve the problem: You can disable switching (between dedicated graphic to integrated graphic) in the energy saver preferences, and this issue may be totally gone. The battery life may get shorter of course, since you are no longer saving energy (using dedicated graphics all the time).
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By the way how do you know (how do you make sure) that it uses integrated graphic all the time ? I mean did you find a way to switch off the dedicated graphics card (such as https://gfx.io) ? I’m asking this because you say there is no problem when it uses only integrated graphics, however this is not normally possible by original native apple software. Either you have dedicated graphics all the time if you disable energy saving feature, or you have intermittent switching between dedicated graphic and integrated graphic during use. My guess is, the time periods you don’t have any problem are when you are on dedicated graphics all the time.
If you don’t want any problems when you use dedicated graphics card (AMD), you MUST use only the default display settings for your retina display (i.e. 1440x900, it may also be designated as 2880x1800 in your computer since it’s quadrupled by using factor 2x2 for each figure, due to “retina” specification).
You can use “more space” or “larger text” options in Mac’s own display settings '''''only when you switch off''''' the dedicated graphics card.
Hope this helps.