On 11/30/25 10:34 AM, otto.cooper wrote:
I thought I had good news, but I doubt it now.
Two identical Supermicro attached to two identical UPS from EATON, using the
latest release of obsd, see the usb ups link randomly.
I just disabled usb3 and xhci hand-off from their bios, leaving ehci on. One
machine now detects the ups, the other one does not.
so...you do realize how many hundreds, maybe thousands of different
SuperMicro systems have been made over the years? (I've probably
got at least ten different SuperMicros in my life now, maybe far
more. I love 'em. I love how when Dell, EMC, or IBM needs a
good cheap computer, they rebrand a SuperMicro rather than using
one of their own proprietary piles of junk.)
And I'm sure Eaton has made precisely one UPS in its history...
But in short, obviously something isn't as identical as you think.
(right now, you are stomping your feet and saying "YES THEY ARE!"
no...they aren't, as your results are showing. And yes, I'm a
jerk at work when people say, "NOTHING CHANGED", too.)
So... start with a dmesg from both. Run the dmesg through "diff -u".
Are they as "identical" as you think? Little things like ROM
revisions matter.
If the dmesgs confirm your statement that they are the same, swap
the UPSs between machines, and the cables between machines.
Does the problem follow the computer, the cable, or the UPS?
If it follows the computer, look in the BIOS setup, screen by
screen, on both machines.
Something is different. you need to find it. Especially since
you provided no information for us to work from. :)
Nick.
