Public bug reported:
Since upgrading my Trusty kernel to 3.13.0-44.73, the backlight on my
Ultrabook laptop flickers frequently. It seems to flicker whenever an X
application refreshes part of its window. The backlight flicker is most
noticeable with Chrome browser and mplayer video player. Sometimes it
will flicker a few times, sometimes continue to flicker quickly.
Occasionally the backlight will stay off for a while, and then I can see
the windows very faintly if I have good room lighting, so it's
definitely a backlight problem.
My display hardware is Intel HD Graphics 4400 (i965 driver)
I backed off to the previous kernel, 3.13.0-43.72, and the flickering
problem stopped. Now backlight stays on consistently, as it should.
** Affects: linux-lts-trusty (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1414102
Title:
backlight flickers with Intel HD Graphics 4400 and 3.13.0-44
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