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Groups > linux.debian.kernel > #65503

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")

Cross-posted to 2 groups.

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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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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") Josh Triplett <josh@joshtriplett.org> - 2019-10-22 21:00 +0200
  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") Tomas Janousek <tomi@nomi.cz> - 2019-10-23 00:20 +0200
    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") Tomas Janousek <tomi@nomi.cz> - 2019-10-23 09:40 +0200
      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") Tomas Janousek <tomi@nomi.cz> - 2019-10-23 17:30 +0200
        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") Ben Hutchings <ben@decadent.org.uk> - 2019-10-25 04:00 +0200
          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") Ansgar <ansgar@43-1.org> - 2019-10-25 09:50 +0200
            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") Tomas Janousek <tomi@nomi.cz> - 2019-10-25 10:00 +0200
              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") Ansgar <ansgar@43-1.org> - 2019-10-25 11:10 +0200
                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") Tomas Janousek <tomi@nomi.cz> - 2019-10-25 11:30 +0200
                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") Ansgar <ansgar@43-1.org> - 2019-10-25 12:00 +0200
          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") Ansgar Burchardt <ansgar@debian.org> - 2019-10-25 10:30 +0200
            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") Ben Hutchings <ben@decadent.org.uk> - 2019-10-25 15:20 +0200
  Bug#942881: Confirming bug on Dell XPS 13 9360R Wilhelm Westermark <wilhelm@westermark.org> - 2019-10-23 01:20 +0200

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