Kernel Regression: ACPI Lid Switch / Suspend Failure on 7.0.0-28-generic (ASUS VivoBook X510UF)

[Shashwat Pathak]

Dear Ubuntu Kernel Team,

I am reporting a hardware regression in the 7.0.0-28-generic kernel that
breaks ACPI lid switch events and system suspension on my ASUS laptop.

The system functions flawlessly on the previous 7.0.0-27-generic kernel,
but updating to .28 results in a total failure of the lid sensor to trigger
the suspend state.

*Hardware Specifications:*

   -

   *Machine:* ASUS VivoBook S15-X510UF
   -

   *Graphics:* Dual Graphics (Intel + NVIDIA) configured in "On-Demand"
   mode (NVIDIA driver 580).
   -

   *BIOS:* Secure Boot is enabled (MOK enrolled properly for DKMS modules).

*Steps to Reproduce on 7.0.0-28:*

   1.

   Boot into 7.0.0-28-generic.
   2.

   Close the laptop lid.
   3.

   Wait 15–30 seconds.
   4.

   Open the laptop lid.

*Expected Behavior (Works perfectly on 7.0.0-27):* The system should
initiate a deep sleep when the lid is closed. Upon opening the lid, the
backlight should restore and the system should display the GNOME
lock/password screen.

*Actual Behavior on 7.0.0-28:* The system entirely ignores the hardware lid
close event. It does not enter [deep] sleep. The Intel graphics chip kills
the backlight, but because the kernel aborts or ignores the suspend
command, the backlight never turns back on when the lid is reopened. The
laptop remains fully awake with a completely dim (zombie) screen, requiring
a hard reboot.

*Troubleshooting Undertaken:*

   -

   The issue is not the desktop environment. Software locks (pressing Super
   + L) work perfectly, lock the screen, and wake up normally.
   -

   The issue is not a DKMS failure. I forced a complete rebuild of the
   nvidia-dkms-580 modules specifically for the .28 kernel, enrolled the
   MOK via MOKManager, and verified the build was successful.
   -

   Checked /sys/power/mem_sleep to ensure [deep] was selected.

Because .27 successfully routes the ACPI lid commands to the hardware and
properly sleeps, but .28 completely fails, this is a clear kernel code
regression affecting ASUS VivoBook lid sensors or dual-graphics sleep state
handoffs.

I have temporarily purged .28 and placed it on hold to maintain a working
system on .27. Please let me know if you need me to reproduce the issue on
.28 to pull specific journalctl logs.

Thank you for your time and work on Ubuntu.


-- 
Thanks and regards,

*Shashwat Pathak, Ph.D.*
CEO, AIC GNITS Foundation
*(Atal Incubation Center funded under AIM, NITI Aayog, GoI)*
Founder CEO, Atal Community Innovation Center Meerut
Call +918299474858, +917376878312
*Alternate email: *shashwat at mnnit.ac.in
*LinkedIN Profile:*https://www.linkedin.com/in/dr-shashwat-pathak-2b062069/
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