I saw some updated comments at
https://gitlab.freedesktop.org/drm/i915/kernel/-/work_items/16098#note_3630125
that suggest the problem is fixed in Kernels 7.1.6+.

"For anyone still on a 7.0.x distro kernel: @kdekto's point bears
repeating, because it explains most of the contradictory reports in
these threads. 7.0.y never received the backport (EOL at 7.0.14) — the
fix is in 7.1.6+ (af128ca139d6) and 7.2 (062499cc). I verified the tag
ancestry locally before switching. Ubuntu's 7.0.0-x will not get it
either, so "still broken on 7.0.x" is a report from a kernel that never
had the fix."

I installed ubuntu mainline kernel 7.1.10 from
https://kernel.ubuntu.com/mainline/v7.1.10/, booted into 7.1.10 from
GRUB and did a single test so far waiting 55minutes to attempt resuming,
and it worked perfectly. I made no other changes to my system. I will
retry with longer suspend times over the coming nights and see if it
holds. I have not tested 7.2 mainline yet, but probably will soon.

It is my understanding (but i'm no expert on this) that the fix MIGHT
eventually be backported into some future ubuntu 7.0.0-xx release, but
there is no guarantee of that happening. So, there may be no relief in
sight if you are waiting for that. I'm not sure if there is an easy way
to keep track of whether or not the ubuntu kernel team does that, if
anyone knows please feel free to comment.

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https://bugs.launchpad.net/bugs/2161937

Title:
  ThinkPad P1 Gen 7 (Intel Meteor Lake) black screen after suspend
  (s2idle) on Ubuntu 26.04

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