Ubuntu 16.10
nvidia 375 installed then switched to intel
freeze on lightdm login screen

Apr  5 20:56:21 xps kernel: [    6.489405] bbswitch: disabling discrete graphics
Apr  5 20:56:21 xps kernel: [    6.489411] ACPI Warning: 
\_SB.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI 
requires [Package] (20160422/nsarguments-95)
Apr  5 20:56:21 xps kernel: [    6.508439] pci_raw_set_power_state: 60 
callbacks suppressed
Apr  5 20:56:21 xps kernel: [    6.508441] pci 0000:01:00.0: Refused to change 
power state, currently in D0
Apr  5 20:56:21 xps lightdm[1303]: Seat type 'xlocal' is deprecated, use 
'type=local' instead
Apr  5 20:56:21 xps kernel: [    6.749591] Non-volatile memory driver v1.3


** Attachment added: "syslog"
   
https://bugs.launchpad.net/ubuntu/+source/nvidia-prime/+bug/1663926/+attachment/4855443/+files/syslog

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https://bugs.launchpad.net/bugs/1663926

Title:
  Dell XPS 15 9560 (Nvidia 1050) black screen, Feb 11, 2017

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