https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212117
Bug ID: 212117
Summary: Excessive power consumption in VT
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: johan...@brilliantservice.co.jp
I am concerned that there might be something in VT that are causing high power
consumption.
At login prompt FreeBSD 12-CURRENT on my UP board (Intel Cherryview) the power
consumption is steady at 5W when idle, measured with a watt meter on the 120V
side.
When I do kldload i915kms the power consumption drops to 4W. As comparison,
even running a simple OpenGL app with 60 fps refresh rate in KMS mode does not
cause higher consumption than 4-5W. Starting X brings it up to around ~5W
again.
In /boot/loader.conf I'm loading
zfs
coretemp
acpi_video
CPU is 99.8% idle when running top in from ssh login.
The watt meter only show whole watts so the difference might not be as big as 1
watt but there definitely is a difference. As someone else said in the mailing
list, the difference is so big in their system it causes the fans to run high
and changing to syscons solved the problem.
https://lists.freebsd.org/pipermail/freebsd-x11/2016-August/017860.html
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