Public bug reported:
Dell XPS 15 9530, hybrid Intel Iris Xe + RTX 4070 Laptop (AD106M),
Ubuntu 26.10, nvidia 615.71.09 (open, from the archive), GNOME/Wayland,
PRIME on-demand, display on the iGPU.
Same driver, same DKMS build, same config, only the kernel differs:
7.3.0-8-generic:
/proc/driver/nvidia/gpus/0000:01:00.0/power
Runtime D3 status: Not supported
Video Memory: Active
power/runtime_status = active
power/runtime_suspended_time = 0 (across full uptime, every boot)
7.0.0-38-generic:
/proc/driver/nvidia/gpus/0000:01:00.0/power
Runtime D3 status: Enabled (fine-grained)
Video Memory: Off
power/runtime_status = suspended
power/runtime_suspended_time = 24769
Every documented RTD3 requirement is satisfied on both kernels:
- Ada GPU (newer than the Turing minimum)
- CONFIG_PM=y, CONFIG_PCIE_PME=y
- ACPI _PR3 present: \_SB_.PC00.PEG1.PG01 "New power resource";
power_resources_D3hot present on the parent bridge 0000:00:01.0
- d3cold_allowed=1 on bridge and GPU
- NVreg_DynamicPowerManagement=0x02, set by Ubuntu's own
/usr/lib/modprobe.d/nvidia-runtimepm.conf
- no displays on the dGPU (no card2-* connectors)
- platform ships a dedicated RTD3 ACPI table:
ACPI: SSDT (v02 DELL DellRtd3 00001000 INTL 20200717)
So on 7.3 the driver declines RTD3 on a platform that meets every
requirement and that demonstrably works on 7.0.
Impact: the dGPU is pinned in D0 permanently — constant idle power draw
and heat on battery.
Likely the same regression as CachyOS/linux-cachyos#1053, where 7.2.6
reported "Enabled (fine-grained)" and 7.3.0-rc3 reported "Not supported".
That reporter believed it was CachyOS-specific; this reproduces on
Ubuntu's own 7.3.0-8-generic, so it is not. Combining both data points
puts the regression window at 7.2.6 -> 7.3.0-rc3.
Not reproducible on 7.0.0-38-generic. I have no 7.1/7.2 kernels installed
to narrow it further locally, but can test builds on request.
** Affects: compiz-plugins-main (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2169505
Title:
NVIDIA dGPU never enters RTD3 on kernel 7.3.0; works on 7.0.0
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