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Upgrade kernel to 3.19+ OR Bumblebee cannot enable discrete graphics

Hi list,

I was wondering if anyone had instructions on how to update to kernel
3.19 or above.
I have spent ~an hour googling, but all I can find are tutorials for
ubuntu, most of which do it through apt.

I checked jessie-backports but 3.16 seems to be the latest available
outside of unstable.

The reason I want to upgrade is I seem to be affected by a bug[1] that
causes bumblebee to not be able to switch on my discrete graphics card,
and said issue was reportedly fixed in kernel 3.19[2]

Or if someone knows how to fix this without upgrading that would be even
more appreciated.
My issue is that bumblebee can't enable my discrete graphics card.

I have a GT 745m
01:00.0 3D controller: NVIDIA Corporation GK107M [GeForce GT 745M] (rev ff)

my onboard:
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core
Processor Integrated Graphics Controller (rev 06)

whenever I try to `optirun` anything I get
$ optirun glxgears
[37224.064111] [ERROR]Cannot access secondary GPU - error: Could not
enable discrete graphics card

[37224.064129] [ERROR]Aborting because fallback start is disabled.

and bumblebee logs:
[37207.802462] [INFO]bumblebeed 3.2.1 started
[37207.802516] [INFO]Initialization completed - now handling client requests
[37224.051468] [DEBUG]Accepted new connection
[37224.051559] [INFO]Switching dedicated card ON [bbswitch]
[37224.064087] [ERROR]Could not enable discrete graphics card
[37224.064145] [DEBUG]Socket closed.

and dmesg:
[37254.827782] bbswitch: enabling discrete graphics
[37254.840269] pci 0000:01:00.0: Refused to change power state,
currently in D3

[1]: https://github.com/Bumblebee-Project/Bumblebee/issues/615

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