Hey everybody,
I dug around in the source code of vga_switcheroo.c in the meantime and
found the feature to only switch the Mux by passing MIGD and MDIS
correspondingly. While issuing IGD, DIS, DDIS, DIGD or any combination
of ON and OFFs in the sleep.d script did not work, passing MIGD does :)
The screen comes back :)
Finally I got a working workaround (hehe) by writing the following
sleep.d script (location: /usr/lib/pm-utils/sleep.d/95switcheroo):
#!/bin/sh
[ -f /sys/kernel/debug/vgaswitcheroo/switch ] || exit $NA
case "$1" in
hibernate|suspend)
echo ON > /sys/kernel/debug/vgaswitcheroo/switch
if grep -c 'IGD:+:Pwr' /sys/kernel/debug/vgaswitcheroo/switch
then
echo MIGD > /sys/kernel/debug/vgaswitcheroo/switch
fi
;;
thaw|resume)
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
;;
*) exit $NA
;;
esac
Now i can finally add echo OFF > /sys/kernel/debug/vgaswitcheroo/switch to my
/etc/rc.local and enjoy long battery life and a working standby mode :)
Since only switching the mux to the gpu where it should be (IGD) solves
the black screen on ON issue, I think Its clear that the ON command
(while the DIS is powered down) does switch the mux to the discrete gpu.
Note that this script does NOT solve the bug, its only a workaround.
Greetings
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https://bugs.launchpad.net/bugs/1077675
Title:
ON to vgaswitcheroo/switch causes Mux to switch to ATI
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