Open bug in launchpad.net https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1511473 dmesg: [ 163.227218] nouveau E[ PBUS][0000:01:00.0] MMIO read of 0x00000000 FAULT at 0x002140 [ !ENGINE ]
... gpu comes ok ... [ 133.975729] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20141107/nsarguments-95) [ 133.975805] ACPI: \_SB_.PCI0.PEG0.PEGP: failed to evaluate _DSM [ 133.975809] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20141107/nsarguments-95) [ 149.703743] r8169 0000:03:00.0 eth0: link down [ 163.217080] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20141107/nsarguments-95) [ 163.217166] ACPI: \_SB_.PCI0.PEG0.PEGP: failed to evaluate _DSM [ 163.217170] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20141107/nsarguments-95) [ 163.227218] nouveau E[ PBUS][0000:01:00.0] MMIO read of 0x00000000 FAULT at 0x002140 [ !ENGINE ] Weird, I guess it doesn't come out of runpm sometimes? You can workaround this by booting with nouveau.runpm=0 but it will leave the nvidia gpu on the whole time.
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