When I move the mouse to certain areas, the brightness changes. Bright areas make the screen even brighter and dark areas make it even darker. This is really annoying. Does anybody know a solution?

I am using Ubuntu 16.04 on an XPS13 9370. Hardware is Intel(R) UHD Graphics 620 and driver is i915_bpo.

Thank you in advance


I found out it is actually an XPS13 issue or "feature". On the 9370 it is possible to deactivate it in the BIOS:

Settings --> Video --> Dynamic Backlight Control --> Disable!
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I believe it's caused by adaptive brightness:

01-25-2017 07:40 AM RE: Dell XPS 13 (9360) FHD, Adaptive Brightness Issue ?

There is no "issue".

The Dell XPS 13 9360 ships with a design feature called "content-adaptive brightness control" (CABC). This feature will change the brightness of the screen depending on the content that is rendered on the screen.

A number of customers do not like this design feature (me included, by the way). As a result, Dell have made available a tool which allows turning off / turning on of CABC ( www.dell.com/.../DriversDetails ). This tool is _only_ available for systems with the QHD display, as, apparently, the tool reconfigures the screen panel firmware.

For the record: personally, I am very happy with CABC turned off on my QHD display. I am also very happy that there is no dynamic brightness control (reacting to environment brightness) is implemented either.

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