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I have been using this laptop for almost a year with no problems dual-booting KDE neon(Ubuntu-based distro) and Windows 10, and recently I started getting file system errors and a system freeze afterwards (cannot login in virtual terminals but can do REISUB). The system freezes or starts misbehaving and then I switch to the virtual terminal and I see the errors (http://imgur.com/a/5Bcrh) Fscking fixes the errors but they come again later, and even a bad cluster check doesn't show any problems, I tried formatting the partition and re-installing neon but they came back shortly (in less than a day).

Windows seems to work properly but unfortunately there are no tools from Samsung to help diagnose problems for this drive or report device health.

Where can I dig further and what tools can help me analyze this problem ?

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Turns out it's a known bug with recent kernels and Samsung SSDs, solution is:

Until a proper fix is implemented, a workaround is suggested, which involves adding a kernel parameter:

Please try nvme_core.default_ps_max_latency_us=5500, if the issue persists, please try nvme_core.default_ps_max_latency_us=200.

Full solution here: https://askubuntu.com/a/906105

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