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I've noticed that my laptop has been running hotter than it should be as well as output similar to the following from dmesg around when bbswitch should be shutting down my Nvidia GPU

[ 5775.721636] NVLINK: Unregistered the Nvlink Core, major device number 248
[ 5775.721996] [drm] Module unloaded
[ 5775.747097] bbswitch: disabling discrete graphics
[ 5775.747109] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20141107/nsarguments-95)
[ 5775.761965] pci 0000:01:00.0: Refused to change power state, currently in D0

Based on this, it appears that bbswitch is failing to actually turn off the GPU

For reference, output of lspci | grep 01:00

01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [GeForce GT 635M] (rev ff)

Bumblebee is working correctly aside from this issue. I'm using Ubuntu 15.04.

bain
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Andrew Roskuski
  • 173

1 Answers1

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This looks like BumbleBee bug #664:

This is harmless and known from the beginning. From what I remember, this is due to trying to power OFF the card too fast or something like that. I’ll keep this issue opened (but cleaned a bit your messages to keep only related content) so that we think about either fixing this or properly document it.

bain
  • 12,200