SSD mode on hybrid disk (SSHD)

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Hi all,

I've replaced my notebook HDD with an SSHD hybrid disk (Seagate ST1000LM).
contrary to my experience with other similar machines, the disk
performance are really poor.

I suspect that it depends on btrfs detecting it as an SSD disk
(according to this dmesg message):

BTRFS: detected SSD devices, enabling SSD mode

is this the way it is supposed to be for hybrid disks?
is there a way to disable SSD mode (and, is it something I should try?)

thanks,
Federico
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