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SubjectRe: [RFC] tty/sysrq: Add alternative SysRq key
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Hi,

W dniu 04.11.2021 o 15:17, Andrzej Pietrasiewicz pisze:
> Hi Maciej,
>
> W dniu 04.11.2021 o 14:13, Maciej W. Rozycki pisze:
>> On Thu, 4 Nov 2021, Maciej W. Rozycki wrote:
>>
>>>   The reason for this is with their more recent laptops Lenovo in their
>>> infinite wisdom have placed the <PrintScreen> key (which in a traditional
>>> PS/2-keyboard manner produces <SysRq> when combined with <Alt>) in their
>>> keyboards between the right <Alt> and <Ctrl> keys.  With thumbs not being
>>> as accurate as other fingers (and the overall misdesign of the keyboard
>>> and touchpad interface) you can imagine how often I have inadvertently hit
>>> <SysRq> combined with a letter key, wreaking havoc to my system (and of
>>> course I want to keep the key enabled for times when I do need it).
>>
>>   On second thoughts this can be disabled with `setkeycodes 54 0' once we
>> do have an alternative combination available.
>>
>
> Doesn't `setkeycodes` affect only one keyboard? What if there are more
> keyboards connected to a machine?
>
> From drivers/tty/vt/keyboard.c:
>
> /*
>  * Translation of scancodes to keycodes. We set them on only the first
>  * keyboard in the list that accepts the scancode and keycode.
>  * Explanation for not choosing the first attached keyboard anymore:
>  *  USB keyboards for example have two event devices: one for all "normal"
>  *  keys and one for extra function keys (like "volume up", "make coffee",
>  *  etc.). So this means that scancodes for the extra function keys won't
>  *  be valid for the first event device, but will be for the second.
>  */
>

My second thoughts: if we run `setkeycodes` to map, say, F10 as SysRq,
don't we lose F10?

Andrzej

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