Bug 2399801

1. Please describe the problem:
Short Summary:
Experiencing high s2idle battery drain on Fedora 42 kernel; GPU runtime PM does not suspend

Description:
Fedor 42 on my laptop drains ~1,3%/h during s2idle, which is unexpectedly high. 
The hardware is capable of reaching ~0.3%/h (tested with Ubuntu 24 live iso with 6.14.0, same BIOS/Firmware/EC)

Suspected cause:
GPU does not go into properly suspend (neither when display is blank nor in s2idle)
Intel xe GPU runtime_status stays "unsupported" and runtime_suspended_time stays 0 during screen blank and during s2idle tests.

Hardware:
Lenovo ThinkPad T14s Gen6 Intel Ultra 5 228V (Lunar Lake). lspci/lsusb will be attached.
Hardware does not support "deep" sleep (S3)

2. What is the Version-Release number of the kernel:
Fedora Linux 42 (Workstation Edition)
Kernel: 6.16.8-200.fc42.x86_64
linux-firmware: linux-firmware-20250808-1.fc42.noarch

3. Did it work previously in Fedora?
Unknown, just noticed on a fresh F42 Workstation istall


4. Can you reproduce this issue?
Read 
   `/sys/class/drm/card0/device/power/runtime_status`
   `/sys/class/drm/card0/device/power/runtime_suspended_time`
sleep for 10 minutes
   `rtcwake -m mem -s 600`
Read both parameters again

runtime_status is "unsupported", should be ""active"" during normal operation and "suspend" when it is supending (e.g. blank screen or during s2idle)
runtime_suspended_time is and stays 0, should increase during suspending


5. Does this problem occur with the latest Rawhide kernel?
Yes, reproducible with 6.17.0-0


6. Are you running any modules that not shipped with directly Fedora's kernel?:
No

7. Please attach the kernel logs.
Attached; dmesg, akeup_sources before/after, runtime_status snapshots, journal -k, NVMe APST parameter, USB autosuspend state, 20-minute s2idle battery delta

Battery delta 0,5Wh in 20 min (58Wh nominal -> 2,5%/h calculated, the 1,3%/h are reached during longer tests, like 10h and based on reported %)

Reproducible: Always