I forgot to say this: for those who have this bug, simply add this line
in a service which is launched before X' start (e.g. in
/etc/init/lightdm.conf, just after the line with 'script'):
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
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https://bugs.launchpad.net/bugs/1170917
Title:
Powering down inactive GPU while running X causes NULL pointer
dereference
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