Thanks for the report. I do see the commit "UBUNTU: SAUCE: hack:
efi/libstub: enable t14s boot failure hack only" in plucky but not
questing. I'll investigate further and work on this in
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2107976 to keep it
all together.

** Changed in: linux (Ubuntu)
       Status: Confirmed => In Progress

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Kevin Becker (kevinbecker)

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https://bugs.launchpad.net/bugs/2117174

Title:
   Questing fails to boot on (older) Macs

Status in linux package in Ubuntu:
  In Progress

Bug description:
  With older Macs Questing fails to boot. The built-in displays stay
  blank but the backlight is visible until I force the computers to
  power off. External video doesn't show anything.

  This is almost certainly the same issue as for Plucky:

  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2105402/comments/16

  The fix for Plucky just rolled out as an SRU but Questing inherited
  the bad patch.

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