Created attachment 127659 [details]
with 4.9.0-040900rc2-generic and video=DP-1:d video=DP-2:d video=HDMI-A-1:d video=HDMI-A-2:d and no efifb and no hdmi attached, i915 does not seem to enter a low powersave state: attachment hdmi_attached
Same setup, but with hdmi attached (gives me the efifb) and it will enter the low powersave state, which remains even if I detach the hdmi after boot: attachment hdmi_unattached
I am not sure this is due to the efifb present, or the HDMI present, because settings are otherwise identical.
The difference in power is 0.3watt.
Created attachment 127660 [details]
(In reply to fred from comment #0)
hdmi_attached and hdmi_unattached are the wrong way round.
Hello Fred. I'm sorry about this delay until getting back to you. Are you still facing this problem? Preferable tested with the latest kernel from drm-tip. Can you also provide data from /sys/kernel/debug/dri/0/i915_display_info from both of the scenarios?
based on the lack of activity this bug will be closed... please if the problem is reproducible with latest configuration open a new bug including logs.