XPS 9550 is the consumer version of Precision 5510, right?
I did some test on Precision 5510 a while back and the BIOS did fix the issue.
The latest BIOS disables CommClk and ClockPM when it's on battery, and disables
the ASPM entirely when it's on power adapter.
** Changed in: linux (Ubuntu)
Status: Incomplete => Won't Fix
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https://bugs.launchpad.net/bugs/1805816
Title:
APST quirk needed for PM951 Samsung 1TB NVMe Drive
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