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Single ? mark in terminal

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PDP-8:
[SOLVED]

It was acpi related.  Out of all the acpi disabling option, only a total disable prevented the errant ? from occurring when using this option in the boot line:


--- Code: ---acpi=off
--- End code ---

Thing is, now the machine won't power down - it will just halt and burn batteries.

Think I'll live with the ? showing up just once at boot. :)

PDP-8:
Even better!  Backlights!

Researching the acpi on this old laptop led me to an accidental discovery - easy backlight control with the function keys!

So leaving acpi alone for the time being, I added these to the boot line


--- Code: ---acpi_osi=Linux   acpi_backlight=vendor
--- End code ---

Tada!  Function keys now easily control the backlight brightness on this box.  Thank you pesky ? mark ! :)

PDP-8:
Note - don't get too excited about thinking about making these two options a global change to all your other machines!

This was a bios/acpi total linux osi kludge-fest for just this machine.  Might work on others, but no guarantees due to the total mangling of the spec by various parties.

https://www.kernel.org/doc/html/latest/firmware-guide/acpi/osi.html

Try it if you must, but it isn't a globally guaranteed fix you can rely on.

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