Bug#897572: linux-image-4.16.0-1-amd64 breaks plymouth LUKS prompt
On Sat, 05 May 2018 20:01:45 +0100 Ben Hutchings <ben@decadent.org.uk>
wrote:
> 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.
Hello Ben,
plymouth doesn't uses Xorg, it uses libdrm and KMS directly.
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