RTX 5060 Ti: system hangs on suspend (deep/S3), never resumes — 595.71.05 open driver, kernel 7.0.0-27/28

NVIDIA Open GPU Kernel Modules Version

595.71.05 (nvidia-driver-595-open, Ubuntu package 595.71.05-0ubuntu0.26.04.1)

Please confirm this issue does not happen with the proprietary driver (of the same version). This issue tracker is only for bugs specific to the open kernel driver.

• I confirm that this does not happen with the proprietary driver package.

Operating System and Version

Ubuntu 26.04 LTS

Kernel Release

Linux bruno 7.0.0-28-generic #28-Ubuntu SMP PREEMPT_DYNAMIC Sun Jun 21 01:01:36 UTC 2026 x86_64 GNU/Linux

Please confirm you are running a stable release kernel (e.g. not a -rc). We do not accept bug reports for unreleased kernels.

• I am running on a stable kernel release.

Hardware: GPU

NVIDIA GeForce RTX 5060 Ti

Describe the bug

System completely hangs when entering suspend (deep/S3) and never resumes. Kernel log ends exactly at "PM: suspend entry (deep)" / "Filesystems sync" with no further entries — no "PM: suspend exit", no resume messages at all. Journald itself goes silent, indicating the hang happens very early in the suspend sequence, before/during device suspend callbacks. Only a hard power-off recovers the system.

Reproducible on both linux-image-7.0.0-27-generic and linux-image-7.0.0-28-generic with the identical nvidia-driver-595-open package (595.71.05) — kernel version does not affect the outcome.

Switching /sys/power/mem_sleep to s2idle allows the system to suspend/resume successfully (~16s cycle, clean "PM: suspend exit"), but s2idle does not provide real power savings on this desktop board: /sys/kernel/debug/pmc_core/substate_residencies shows S0i2.0 and S0i2.1 residency of 0 after a full sleep cycle, and fans/ARGB/PSU remain fully active throughout — consistent with this desktop chipset (Intel B760) not supporting genuine Low Power S0 Idle, so s2idle is only a workaround, not a real fix.

This appears related to #1157 (RTX 4070 Ti, same driver 595.71.05, same kernel 7.0.x line, identical hang signature).

To Reproduce

1. Install nvidia-driver-595-open (595.71.05) on Ubuntu 26.04 with kernel 7.0.0-27 or 7.0.0-28
2. Ensure mem_sleep_default=deep (desktop default) and NVreg_PreserveVideoMemoryAllocations=1
3. nvidia-suspend/resume/hibernate systemd services enabled (default)
4. Trigger suspend via systemctl suspend or KDE Plasma's sleep action
5. Observe: kernel log ends at "PM: suspend entry (deep)", system becomes fully unresponsive (no display wake, no keyboard/mouse response, fans stay at full/normal, no ACPI wake), requires hard power cycle

Bug Incidence

Always

nvidia-bug-report.log.gz

nvidia-bug-report-sanitized.log

More Info

No response

Start with the sanitized nvidia-bug-report log and the nvidia-suspend, nvidia-resume, and nvidia-hibernate services while reproducing with mem_sleep_default=deep. Compare the suspend path and logs for kernels 7.0.0-27 and 7.0.0-28, using s2idle only as the working comparison. Done means RTX 5060 Ti systems suspend and resume reliably in deep/S3 without requiring a hard power-off.