Another possibility is that LCD panel dithering (controlled by the i915
kernel driver) has changed between kernel versions.
If your LCD panel is natively 6-bits per channel then the kernel should
be turning on dithering for you, since the shell is typically rendered
as 8-bits per channel. If dithering is not enabled then you will see
banding and effectively see a loss of 75% of your colours and gradients.
But the tricky part is for a developer to find a machine with the same
problem. The problem will be specific to your GPU model (the dithering
logic in i915 varies between generations), and specific to the LCD panel
type in that laptop. Effectively we will need to find a similar Haswell
laptop with a similar LCD type, which is the hard part...
** Summary changed:
- Colour banding and artefacts appear system-wide on an Intel HD Graphics 4400
+ Colour banding and artefacts appear system-wide on an Asus Zenbook UX303 with
Intel HD 4400 graphics
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Colour banding and artefacts appear system-wide on an Asus Zenbook
UX303 with Intel HD 4400 graphics
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