OS/2, eCS & ArcaOS - Technical > Setup & Installation

No mouse/keyboard after BIOS update

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Per E. Johannessen:
Hi,

I've successfully updated BIOS on my Thinkstation P520 but now the USB mouse and USB keyboard are not working in AOS 5.0.4 nor in AOS 5.1.
(All works in Win10)
The new BIOS, S03KT67A, is quite different from the old one so I'm not sure if there is a setting somewhere that needs to be changed.
(I've never run this system in UEFI and it looks like all CSM settings from old BIOS are intact.)

Per E. Johannessen:
Found the setting "XHCI Hand-off" in BIOS, set it to Disabled, rebooted and keyboard seems to work ok.
Mouse also works except for the wheel, nothing happens when scrolling.

Appreciate comments.

Per E. Johannessen:
Well, I'd forgotten the "above 4G decoding" in BIOS, now disabled and mouse wheel also works.

Martin Iturbide:
Hello Per.

Just to know a little bit more I was checking a Simulator of your BIOS

I guess is this one (text mode only).
- https://download.lenovo.com/bsco/index.html#/textsimulator/ThinkStation%20P520%20(30BE,30BF,30BQ)

What is the two things? "XHCI Hand-off" and "above 4G decoding" the things that did the trick? or just one of those?

I have this hardware report on the wiki:
- https://www.os2world.com/wiki/index.php?title=Lenovo_ThinkStation_P520
It says "enable "CSM" and disable "Above 4G Decoding"".
I don't remember who reported that on 2020, was it you?

Did the BIOS updated enabled back the "Above 4G Decoding"?

Regards

Per E. Johannessen:
Hi Martin,

At the point I disabled "XHCI Hand-off" I did not have the "above 4G decoding" in mind, so after a reboot only mouse buttons 1 and 2 were working
and the system also seemed a bit "unstable".
Because of this I checked BIOS again and noticed that "above 4G decoding" was enabled, then I disabled it and now mouse are keyboard are fine.
I believe that updating BIOS somehow enabled "above 4G decoding".

Don't really know if "XHCI Hand-off" should be enabled or not, the system works with it enabled and with "above 4G decoding" disabled.
Nice if someone who knows could clarify.

(Tried the link to the BIOS simulator but it won't work with my Firefox installation, anyway I've used it before from a Win10.)

And, yes, I remember reporting this hardware a few years back.

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