Test result for 7.0.0-28.28-generic:

I booted the official Ubuntu kernel 7.0.0-28.28 with the matching
Canonical-signed precompiled linux-modules-nvidia-595-open package
(7.0.0-28.28+1). Secure Boot remained enabled, NVIDIA 595.84 was loaded,
and both the internal eDP display and external HDMI display were
connected before the test. MemorySleepMode was explicitly set to deep.

The same failure reproduced:
- The internal eDP panel remained black.
- The external HDMI monitor showed only the wallpaper, with no usable 
lock/login UI.
- The session did not recover after waiting, so a forced reboot was required.

Relevant timeline from the failed boot:
- 23:48:11.087787: PM: suspend entry (deep)
- 23:48:25.956873: xhci_hcd 0000:00:0d.0: xHC error in resume, USBSTS 0x401, 
Reinit
- 23:48:26.185773: PM: suspend exit
- 23:48:51.742765: systemd-suspend.service finished (27.427 seconds wall time), 
about 25.6 seconds after the kernel reported suspend exit.

A later power-button action initiated another deep-suspend cycle, which
again logged the same xHCI USBSTS 0x401 resume error. This occurred
after the initial failed display recovery.

Therefore, 7.0.0-28.28 is not a known-good kernel on this hardware. The
same deep-resume failure has now been reproduced on 7.0.0-28, -29, -30,
and -31. As mentioned previously, this is my first bare-metal Ubuntu
installation on this laptop, so I do not have an older known-good native
Ubuntu kernel version.

I am not planning to test additional older kernels at this time. The
test kernel has been removed and the machine is back on
7.0.0-30-generic.

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https://bugs.launchpad.net/bugs/2164645

Title:
  [Lenovo 82YA][NVIDIA RTX 4060] S3 deep resume leaves internal display
  black and external display wallpaper-only; s2idle works

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