bbswitch is not happy:
[ 4.379608] bbswitch: version 0.8
[ 4.379618] bbswitch: Found integrated VGA device 0000:00:02.0:
\_SB_.PCI0.GFX0
[ 4.379627] bbswitch: Found discrete VGA device 0000:03:00.0:
\_SB_.PCI0.RP05.D034
[ 4.379640] bbswitch: failed to evaluate \_SB_.PCI0.RP05.D034._DSM
{0xF8,0xD8,0x86,0xA4,0xDA,0x0B,0x1B,0x47,0xA7,0x2B,0x60,0x42,0xA6,0xB5,0xBE,0xE0}
0x100 0x0 {0x00,0x00,0x00,0x00}: AE_NOT_FOUND
[ 4.379648] bbswitch: failed to evaluate \_SB_.PCI0.RP05.D034._DSM
{0xA0,0xA0,0x95,0x9D,0x60,0x00,0x48,0x4D,0xB3,0x4D,0x7E,0x5F,0xEA,0x12,0x9F,0xD4}
0x102 0x0 {0x00,0x00,0x00,0x00}: AE_NOT_FOUND
[ 4.379657] bbswitch: failed to evaluate \_SB_.PCI0.GFX0._DSM
{0xA0,0xA0,0x95,0x9D,0x60,0x00,0x48,0x4D,0xB3,0x4D,0x7E,0x5F,0xEA,0x12,0x9F,0xD4}
0x102 0x0 {0x00,0x00,0x00,0x00}: AE_NOT_FOUND
[ 4.379658] bbswitch: No suitable _DSM call found.
Can you try to boot under 4.4.0-92?
Probably a cpu-manager/bbswitch issue instead of a kernel one.
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https://bugs.launchpad.net/bugs/1722269
Title:
No graphical boot with 4.4.0-96 and NVIDIA GeForce 840M
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