[Bug 199619] screen stays dark for long on bootup since kernel 4.17.0-rc2+

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=199619

--- Comment #12 from Ant (untaintableangel@hotmail.co.uk) ---
Elmar, did you have a look at my bug report from comment 4? 

Does installing something like rng-tools fix the problem? 

If it does, then you are suffering from the same, widespread, well-documented
issue that began with 4.17-rc2 with
commit43838a23a05fbd13e47d750d3dfd77001536dd33 (random: fix crng_ready() test).

The kernel is waiting for enough entropy to have been generated and it causes a
long hang until you mash on random keys or something else helps generate it.
Until then, you get a nice black screen.
Unfortunately, this has the side effect of slightly lengthening the shutdown
and restart time by a few seconds, but the boot/login time is returned to
normal. 

I used to have an ath9k based wireless card and there is an option in the
kernel to use it to help add to the entropy pool. This solved the problem
completely for me on my custom kernels, but then I went and got a new wireless
card that isn't so fortunate as to have this option in the kernel config and
I'm back to waiting for a more permanent fix too.

At least give it a try, it sounds like the same problem.

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