Bug 98527 - full powersave not entered if no connector attached
Summary: full powersave not entered if no connector attached
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
Depends on:
Reported: 2016-11-01 10:45 UTC by fred
Modified: 2017-07-20 22:28 UTC (History)
1 user (show)

See Also:
i915 platform: BSW/CHT
i915 features: power/runtime PM

hdmi attached (84.65 KB, text/plain)
2016-11-01 10:45 UTC, fred
no flags Details
hdmi_unattached (77.35 KB, text/plain)
2016-11-01 10:45 UTC, fred
no flags Details

Description fred 2016-11-01 10:45:09 UTC
Created attachment 127659 [details]
hdmi attached


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.


Comment 1 fred 2016-11-01 10:45:33 UTC
Created attachment 127660 [details]
Comment 2 fred 2016-11-01 12:33:33 UTC
(In reply to fred from comment #0)
hdmi_attached and hdmi_unattached are the wrong way round.
Comment 3 Jari Tahvanainen 2017-03-21 13:39:34 UTC
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?
Comment 4 Ricardo 2017-07-20 22:28:38 UTC
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.

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