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Bug#931901: Ping to Ben Hutchings, identifying possible source of problem

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On Mon, 2019-07-15 at 08:48 -0400, Kathryn Tolsen wrote:
> It would appear to my untrained eye, that this commit on May 15, 2018 by
> Ben Hutchings is responsible for this issue:
> 
> https://salsa.debian.org/kernel-team/linux/commit/e7bdd24f189b1b8775665d56a1230f7b12915ffe

No, this patch is much older than that.

> This appears to be debian specific and not an upstream issue as the
> upstream code doesn't contain any such checks:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/gpu/drm/radeon/radeon_drv.c?h=v4.19.59#n340
> 
> It would appear this is an incorrect assumption to make, that all cards
> newer than the R600 require firmware.

I really don't think so.

> I can't make out what this code is
> doing without digging way deeper but I think this is what is causing this
> issue. There would need to be an exception here or the patch would need to
> be rolled back or came at from a different angle entirely.

I suspect that this bug is a duplicate of bug #928510, for which the
fix missed the buster release (but we can fix it in a point release). 
If you run "update-initramfs -u" and reboot, does that fix the problem?

Ben.

-- 
Ben Hutchings
If God had intended Man to program,
we'd have been born with serial I/O ports.

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Bug#931901: linux-image-4.19.0-5-amd64: incorrectly identifies some old Radeon HD as newer, preventing X from starting Phil Reynolds <phil-deb2019@tinsleyviaduct.com> - 2019-07-12 09:20 +0200
  Bug#931901: Clarifying this issue, delt with on OFTC in #debian Kathryn Tolsen <katybethtolsen@gmail.com> - 2019-07-15 14:10 +0200
  Bug#931901: Ping to Ben Hutchings, identifying possible source of problem Kathryn Tolsen <katybethtolsen@gmail.com> - 2019-07-15 15:00 +0200
    Bug#931901: Ping to Ben Hutchings, identifying possible source of problem Ben Hutchings <ben@decadent.org.uk> - 2019-07-16 01:20 +0200
      Bug#931901: Ping to Ben Hutchings, identifying possible source of problem Phil Reynolds <phil-deb2019@tinsleyviaduct.com> - 2019-07-16 12:30 +0200

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