https://bugzilla.kernel.org/show_bug.cgi?id=34252
--- Comment #8 from Florian Mickler florian@mickler.org 2011-05-11 06:18:49 --- Hm.. according to the original commit description "ON" / "OFF" is used to turn the not-in-use-card on/off...
What was the behavior before v2.6.38-rc4? I don't know if this was an intended change in behavior or an unintended side effect of some other change. Dave Airlie can probably tell though...
p.s.: Anyway, I presume working around that in userspace is not the issue? (i.e. maybe doing something like this:
IGDINUSE=`grep IGD /sys/kernel/debug/vgaswitcheroo/switch | awk -F":" '{ $3 }'` if [ "x$IGDINUSE" != "x+" ]; then echo IGD > /sys/kernel/debug/vgaswitcheroo/switch fi
)