linux-kernel - Re: Implement per-key keyboard backlight as auxdisplay?

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Date:   Fri, 13 Oct 2023 22:03:01 +0200
From:   Pavel Machek <pavel@....cz>
To:     Werner Sembach <wse@...edocomputers.com>
Cc:     ojeda@...nel.org, Lee Jones <lee@...nel.org>,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        linux-input@...r.kernel.org,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: Re: Implement per-key keyboard backlight as auxdisplay?

Hi!

> > The specific keyboard RGB controller I want to implement takes 6*21 rgb
> > values. However not every one is actually mapped to a physical key. e.g. the
> > bottom row needs less entries because of the space bar. Additionally the
> > keys are ofc not in a straight line from top to bottom.
> 
> So... a bit of rationale. The keyboard does not really fit into the
> LED subsystem; LEDs are expected to be independent ("hdd led") and not
> a matrix of them.
> 
> We do see various strange displays these days -- they commonly have
> rounded corners and holes in them. I'm not sure how that's currently
> supported, but I believe it is reasonable to view keyboard as a
> display with slightly weird placing of pixels.
> 
> Plus, I'd really like to play tetris on one of those :-).
> 
> So, would presenting them as auxdisplay be acceptable? Or are there
> better options?

Oh and... My existing keyboard membrane-based Chicony, and it is from
time when PS/2 was still in wide use. I am slowly looking for a new
keyboard. If you know of one with nice mechanical switches, RGB
backlight with known protocol, and hopefully easily available in Czech
republic, let me know.

Best regards,
								Pavel
-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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