Thank you for your quick response!

This regression / bug was found out almost 2 YEARS ago:
https://bbs.archlinux.org/viewtopic.php?id=225215
and a patch was sent to upstream (see post #2), but apparently it was never 
pulled.

Regarding hex vs dec, the file in master they seem to be mixing both:
https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/drm_edid.c

The product id number for a specific panel is found in Xorg.log:
fgrep EDID /var/log/Xorg.0.log
[   751.496] (II) modeset(0): EDID vendor "SDC", prod id 18514

Anyway, I am hoping that Ubuntu, which has the biggest base of desktop
Linux users (and in particular of people who may have bought laptops
without pre-installed Windows, like Lenovo G50-80 and G50-70), would
choose to fix this regression for Ubuntu users.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1819968

Title:
  Colour banding in Lenovo G50-80 laptop display (i915)

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