Hardware
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I've sworn off their products, but I'm hopeful about this for the sake of those who enjoy Logitech's stuff.
TLDR: intentional kneecapping of less expensive hardware to incentivize spending more for gamer crap
In my case I had a nice illuminated keyboard that I bought because it looked slick and modern, only to discover that they had physically prevented it from sending signals for W + Shift + Space to the PC, preventing one of the most basic things you do in first-person games. You could do any combination of two of those keys, but never all three.
I feel like a nutjob claiming it was intentional without any hard evidence, but I had read several corroborating stories on various forums, and someone "confirmed" that it was an intentional decision to drive more sales of their GaMiNg hardware. I can't and won't support that shit.
Here's hoping they've turned around with new management, but I won't let them make a fool out of me.
I knew not all keyboards have NKRO but only registering 2 at a a time is ridiculous.
IIRC you could roll over more than 2 with pretty much any other combination of keys, just not that most useful combo.
For the sake of a fair argument, my memory could be a bit distorted by my rage-tinted glasses, but the W + Shift + Space issue absolutely was a problem with mine.
After a cursory search I found this ancient reddit thread with many people lamenting the same issue. There are some people defending Logi with some decent arguments, but I'm not convinced that it wasn't intentional design.
Apparently the USB spec affords 6KRO, with modifiers. Mine was at least 3 or else I wouldn't have been able to do Ctrl + Alt + Del 😅
Looking a bit more, looks like the mod keys like ctrl don't count. So you could still c+a+d with a 2 key rollover. I also found something else about how nkro works with USB
Oh yeah, looks like I contradicted myself in my last paragraph haha.
So it looks like it's up to the manufacturer to switch to HID protocol after boot, and if they refuse to implement that for whatever reason (probably cost-cutting), you're SOL? To be fair, I guess most normal users won't ever need to use 6 non-mod keys at a time, but that's still lame. Kinda wish PS/2 devices would make a comeback, since in addition to avoiding this problem, they don't have to rely on the CPU to poll for inputs.