*** This bug is a duplicate of bug 1554613 ***
https://bugs.launchpad.net/bugs/1554613
As comment #117 suggests, disabling tlp fixes it for my Broadwell
Celeron laptop. However, another way to fix it (at least for some of us)
is to set ALPM to a higher power state, which means you can keep tlp
enabled. In the tlp config file /etc/default/tlp, set the line
SATA_LINKPWR_ON_BAT=min_power to SATA_LINKPWR_ON_BAT=medium_power or to
SATA_LINKPWR_ON_BAT=max_performance. If not running tlp, add the same
line to /etc/pm/config.d/sata_alpm (and probably also for
SATA_LINKPWR_ON_AC).
The problem with this solution is that on chips where the southbridge
and cpu are packaged together (Broadwell, Haswell, etc.), the package
won't go into lower power states, so battery suffers. For instance, I
can't get it into anything lower than C2, as powertop indicates.
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https://bugs.launchpad.net/bugs/1522922
Title:
Screen flickering in Intel i915 driver
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