I have a USB 3.0 portable drive which I've used for years with two desktops,
each with black USB 2.0 ports. I used to get roughly 25 MB/s transfer speed
which AIUI is roughly to be expected given that it's limited to USB 2. Lately,
the transfer speed is much slower, around 2 MB/s. I thought maybe it was the
new 6.10 kernel, so I tried the older 6.9.12 kernel, no difference. I also have
a F40 laptop with two blue SS USB 3.0 ports and one yellow USB port, which
ought to be at least as fast as the blue ports. When I plug the portable drive
into either of the blue ports, I get roughly 50 MB/s, and with the yellow port
I get roughly 25 MB/s. The fact that I can get up to 50 MB/s tells me that
there's probably nothing physically wrong with the portable drive. Are there
any known kernel issues that would mess up USB transfer speed? Unfortunately I
don't remember exactly when the problem started but it was fairly recent.
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