Comment 68 for bug 1626436

I had slow boot with 16.10 few months ago. I moved back to 16.04. Today I had time to test some of the kernels above from the bisection process. These are the results

4.4.0-59-generic # Ubuntu 16.04 official January 2017
Startup finished in 4.889s (kernel) + 28.001s (userspace) = 32.890s

4.6.0-040600-generic # from comment 29 ... actually from #34
Startup finished in 5.274s (kernel) + 23.561s (userspace) = 28.836s

4.6.0-040600-generic # comment 36
Startup finished in 5.111s (kernel) + 25.192s (userspace) = 30.304s

4.6.0-040600rc1-generic # comment 54
Startup finished in 4.979s (kernel) + 21.904s (userspace) = 26.883s

4.8.0-26-generic # official Ubuntu 16.10 at November 2016
Startup finished in 15.025s (kernel) + 35.067s (userspace) = 50.093s

4.8.0-29-generic # comment 61
Startup finished in 14.808s (kernel) + 32.516s (userspace) = 47.325s
Startup finished in 15.674s (kernel) + 26.293s (userspace) = 41.967s

4.8.0-34-generic # Official 16.04 repo, apt install linux-generic-hwe-16.04-edge
Startup finished in 15.717s (kernel) + 26.583s (userspace) = 42.301s

Basically the two patches on my (old) laptop reduce the total boot from 50 to 40 something. Obviously there is another issue. On 4.8 kernels (with or without the two patches) I get a short freeze of 1-2 secs when I open a window of System Settings.

I'd suggest we should continue the bisection that Joseph Salisbury started. We should continue after the kernel in comment 54 which is GOOD.