adriangl
f4eb804c59
Switch mem_sleep_default from deep (S3) to s2idle - the Phison E21 NVMe hangs on resume from the D3 transition S3 forces. Remove the no-op d3cold_allowed udev rule (attribute doesn't exist) and the broken nvme-resume-fix service (ExecStart redirect never ran). Add a correct runtime-PM-off rule for the NVMe endpoint and its parent root port.
19 lines
1.4 KiB
Markdown
19 lines
1.4 KiB
Markdown
# Development log
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## legolas: NVMe (Corsair MP600 ELITE / Phison E21) suspend/resume crashes
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The drive hung on resume from S3 (deep) suspend — boot logs ended at `PM: suspend entry (deep)` with no resume, followed by a hard reboot. The Phison E21 can't recover from the D3 transition that S3 forces.
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Investigation also found two existing workarounds were doing nothing:
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- The udev rule `ATTR{d3cold_allowed}="0"` was a no-op — that sysfs attribute doesn't exist on this Phison endpoint or its parent root port (`0000:00:1d.0`).
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- The `nvme-resume-fix` service was broken: `ExecStart` used `>` redirection without a shell, so `echo` just printed the string and never wrote to the `rescan` sysfs file. It never actually rescanned.
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Changes (`hosts/legolas/hardware-configuration.nix`):
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- Switched `mem_sleep_default` from `deep` (S3) to `s2idle` (modern standby). s2idle avoids the deep D3 path that hangs the drive.
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- Removed the no-op `d3cold_allowed` rule and the broken rescan service.
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- Added a correct runtime-PM-off udev rule on both the NVMe endpoint (`0000:6e:00.0`) and its parent root port (`0000:00:1d.0`), keeping the PCIe wakeup disable.
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Note: runtime PM was already off on the endpoint (`power/control=on`); that alone never fixed the crash because system suspend uses a separate code path. Verify after rebuild that the cmdline has `mem_sleep_default=s2idle` (the old running generation showed a stale duplicate `deep`).
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