$ dmesg | fgrep vgaar
[ 0.243143] vgaarb: setting as boot device: PCI:0000:00:02.0
[ 0.243145] vgaarb: device added: PCI:0000:00:02.0,decodes=io+mem,owns=io+mem,locks=none
[ 0.243150] vgaarb: loaded
[ 0.243152] vgaarb: bridge control possible 0000:00:02.0
[ 2.766514] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[ 2336.771620] vgaarb: this pci device is not a vga device
[ 2337.170566] vgaarb: this pci device is not a vga device
[ 2415.373308] vgaarb: this pci device is not a vga device
[ 2415.734668] vgaarb: this pci device is not a vga device
$ uname -a
Linux flat 3.19.0-26-generic #28-Ubuntu SMP Tue Aug 11 14:16:32 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Based on the original bug description, this issue affects me.
$ lspci -nn
00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 09)
...
04:00.0 3D controller [0302]: NVIDIA Corporation GK208M [GeForce GT 740M] [10de:1292] (rev ff)
$ dmesg | fgrep vgaar 00:02.0, decodes= io+mem, owns=io+ mem,locks= none 00:02.0, olddecodes= io+mem, decodes= io+mem: owns=io+ mem
[ 0.243143] vgaarb: setting as boot device: PCI:0000:00:02.0
[ 0.243145] vgaarb: device added: PCI:0000:
[ 0.243150] vgaarb: loaded
[ 0.243152] vgaarb: bridge control possible 0000:00:02.0
[ 2.766514] vgaarb: device changed decodes: PCI:0000:
[ 2336.771620] vgaarb: this pci device is not a vga device
[ 2337.170566] vgaarb: this pci device is not a vga device
[ 2415.373308] vgaarb: this pci device is not a vga device
[ 2415.734668] vgaarb: this pci device is not a vga device
$ uname -a
Linux flat 3.19.0-26-generic #28-Ubuntu SMP Tue Aug 11 14:16:32 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux