This might also happen because of the recent ubuntu-drivers-common
update
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https://bugs.launchpad.net/bugs/1289298
Title:
bbswitch stopped working with the latest ubuntu-drivers-common
And indeed, after downgrading ubuntu-drivers-common to version 0.2.88
and nvidia-prime to version 0.5~hybrid0.0.3, bbswitch works again.
** Summary changed:
- bbswitch stopped working with the latest kernel
+ bbswitch stopped working with the latest ubuntu-drivers-common / nvidia-prime
** Also
