On Fri, 2018-05-04 at 12:20 +1200, Ben Caradoc-Davies wrote:
> On 04/05/18 11:52, Ben Caradoc-Davies wrote:
> > - Pressing *any* key repeatedly is enough to eventually wake up the
> > plymouth LUKS screen. For example, pressing Backspace many times.
>
> Even a modifier key is sufficient. Without input, the screen remains
> blank indefinitely (with just a blinking cursor for "quiet" boot).
> Pressing right Alt 11-18 times (varies from test to test) causes the
> plymouth LUKS passphrase screen to appear.
>
> I have attached a photo of the screen for a boot with "quiet" removed
> from and "plymouth.debug" added to the kernel command line.
I wonder if this is related to the recent RNG changes. It seems that
many programs have started using blocking RNG functions like
getentropy(), and now that the kernel is more conservative in its
initial entropy estimation they can block for a long time. Keyboard or
mouse input adds entropy.
At a guess, plymouth is starting the X server and the X server wants
random bits for MIT-MAGIC-COOKIE authentication.
Ben.
--
Ben Hutchings
We get into the habit of living before acquiring the habit of thinking.
- Albert Camus
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