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Bug#958126: linux-image-5.5.0-2-amd64: Alt-SysRq-x no longer lifts Secure Boot restrictions

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Control: tag -1 wontfix

On Sat, 2020-04-18 at 18:50 +0000, brian m. carlson wrote:
> Package: src:linux
> Version: 5.5.17-1
> Severity: important
> 
> By default, Debian ships kernels such that when booted with Secure Boot,
> that a user cannot hibernate their computer.  However, the combination
> Alt-SysRq-x is documented in the wiki (which is linked to from the
> kernel) to lift these restrictions and allow the user to hibernate.
> 
> However, in this kernel version that does not work, and the user must
> either disable secure boot or forego hibernation.  When pressing
> Alt-SysRq-x, the following is printed:
> 
>   sysrq: HELP : loglevel(0-9) reboot(b) crash(c) terminate-all-tasks(e) memory-full-oom-kill(f) kill-all-tasks(i) thaw-filesystems(j) sak(k) show-backtrace-all-active-cpus(l) show-memory-usage(m) nice-all-RT-tasks(n) poweroff(o) show-registers(p) show-all-timers(q) unraw(r) sync(s) show-task-states(t) unmount(u) force-fb(V) show-blocked-tasks(w) dump-ftrace-buffer(z)
[...]

This was an intentional change listed in the changelog, fixing bug
#947021.  Thanks for mentioning the wiki; I'll update that to reflect
current reality.

If you can't live with the restrictions of Secure Boot, you'll have to
turn it off.

Ben.

-- 
Ben Hutchings
If more than one person is responsible for a bug, no one is at fault.

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Bug#958126: linux-image-5.5.0-2-amd64: Alt-SysRq-x no longer lifts Secure Boot restrictions "brian m. carlson" <sandals@crustytoothpaste.net> - 2020-04-18 21:00 +0200
  Processed: Re: Bug#958126: linux-image-5.5.0-2-amd64: Alt-SysRq-x  no longer lifts Secure Boot restrictions "Debian Bug Tracking System" <owner@bugs.debian.org> - 2020-04-19 00:10 +0200
  Bug#958126: linux-image-5.5.0-2-amd64: Alt-SysRq-x no longer lifts Secure Boot restrictions Ben Hutchings <ben@decadent.org.uk> - 2020-04-19 00:10 +0200
    Bug#958126: linux-image-5.5.0-2-amd64: Alt-SysRq-x no longer lifts Secure Boot restrictions "brian m. carlson" <sandals@crustytoothpaste.net> - 2020-04-19 01:30 +0200
      Bug#958126: linux-image-5.5.0-2-amd64: Alt-SysRq-x no longer lifts Secure Boot restrictions Ben Hutchings <ben@decadent.org.uk> - 2020-04-19 02:40 +0200

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