Also, something, probably prime-select, adds nouveau.runpm=0 to
GRUB_CMDLINE_LINUX_DEFAULT

$ cat `which prime-select` | grep nouveau.runpm
        boot_params['nouveau.runpm'] = '0'
                                 self._grub_path, ['nouveau.runpm', 
'video=VGA'])

I don't understand why it does this, but I removed it , updated grub and
everything works.

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https://bugs.launchpad.net/bugs/1778011

Title:
  SRU: PRIME Power Saving mode draws too much power

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