Some follow up on the issue. I think I know where the problems is, and
is related to switchable graphics.
Apparently, after resuming, the discrete GPU is ON, despite the fact
that vga_switcheroo says it is OFF. Turning ON the discrete GPU, and
turning it OFF again, solves the problem, reducing the power consumption
to the values before suspend.
I created a script to be run after resume with the following lines:
#!/bin/sh
case "$1" in
hibernate|suspend)
;;
thaw|resume)
echo ON > /sys/kernel/debug/vgaswitcheroo/switch
sleep 45
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
;;
*)
;;
esac
exit 0
With this workaround the problem is no present any more.
Should I file a bug on vga_switcheroo?
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https://bugs.launchpad.net/bugs/909337
Title:
Power consumption significantly increased after resume from suspend
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