Bug#942881: Audio on Lenovo X1 Carbon 5th generation stopped working after upgrade to linux-image-5.3.0-1-amd64 ("No response from codec")
On Fri, 2019-10-25 at 11:21 +0200, Tomas Janousek wrote:
> Cool, thanks for reproducing the issue! Just one question: when you say
> production key, does that mean a hardware security module like Ben mentioned,
> or can you reproduce this with a fully software implementation?
The production key is on a YubiKey, i.e. a hardware security module.
Trying with the test key (software) didn't show the problem.
> Provided the latter, that means there exists an input to sign-file that
> produces an invalid (shorter) signature, and it's likely we can find another
> combination of key/module that also fails, and that can be made public (as
> opposed to the Debian production key). I don't have the computing resources
> for this, but if we're sure the reproducer exists, someone at LKML might.
>
> Otherwise I'm afraid you might need to dig a bit deeper. :-)
Sadly it looks like this requires more digging. I'll try later :/
At least it is an interesting problem.
Ansgar
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