FWIW, this appears to work around the issue:
Create file /etc/udev/rules.d/90-nvme-power.rules :
---
KERNEL=="nvme*[0-9]n*[0-9]", ATTRS{model}=="SAMSUNG MZSLW1T0HMLH-000L1*",
ATTR{device/power/control}="on"
---
On my system at least.
I'm sure the kernel should somehow blacklist settings that bakes certain
devices behave erratically, but until then, this appears to do the
trick. No issue in 4 days!
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https://bugs.launchpad.net/bugs/1641322
Title:
frequently lost connection to nvme
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