LOGITECH K750 SUPPORT PDF

Make the most of your warranty. Register Your Product File a warranty claim. Having issues with your keyboard, mouse or Logitech Options on macOS. Wireless Solar Keyboard K Support. Questions about your Wireless Solar Keyboard K? We’ve got the answers, videos, downloads and information you .

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At this point, just launching the application does a bunch of USB traffic.

We have to disconnect the Logitech Unifying Receiver from the kernel. Knowing we’re looking for 2 values battery charge and light meterwe just need to observe and compare the packet emitted on the wire with the values displayed by the Logitech Solar App.

Logitech K keyboard and Unifying Receiver Linux support

Therefore I’m considering this as some sort of useful mark for now. Pressing the “light” button on the keyboard makes even more USB packets coming in and out.

My problem is that there’s supoort no way to know the battery status from Linux, the provided application only working on Windows. A device might contains one or several configurations.

I’m particularly picky on keyboards, but this one is good.

Logitech K750 keyboard and Unifying Receiver Linux support

Found keyboard 0x0x24ec8e0 Charge: In order to solve that, I sent a request for help on the linux-input mailing list. This activity being quite energy consuming, it emptied the whole battery.

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With this driver, each device attached to the receiver is recognized as one different device. This is the one sent by the keyboard to the logktech and that contains the data we want to retrieve. Success 0 URB length [bytes]: To sniff what happens on the USB, you need to load the usbmon Linux kernel module.

Sniffed data Once everything was set-up, I ran my beloved Wireshark.

This keyboard, like many of the new wireless devices from Logitech, uses the Unifying interface. USB stuff you need to know You don’t need to know much about USB to understand what I’ll write about below, but for the sake of comprehensibility ,ogitech write a couple of things here before jumping in.

What’s here interesting is the last part representing the data. This opens a whole new world.

Here’s the interesting packets that I noticed once I excluded the noise:. There’s also several types of packets in the USB wire protocol, and at least two of them interest us there, they are:. We’re going to write a small application using libusb. It’s basically dark, and that makes sense: And one dark night, while fragging on QuakeLive, my keyboard stopped working: It has an incredible useful feature: All of this and more is well and better explained in the chapter 13 of Linux Device Drivers, Third Edition.

Unfortunately, this approach has at least one major drawback. How the keyboard works This keyboard, like many of the new wireless devices from Logitech, uses the Unifying interface.

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When pressing the “light” button, an URB of type interrupt is sent by the keyboard to the computer; An Suupport control packet is sent by the computer to the keyboard in response; Regularly URB interrupt packets are sent just after. At one point they are emitted less often and do not contain the value for the light meter anymore, suggesting that the control packet sent earlier triggers the activation of the light meter for a defined period.

This packets come in regularly 1 per second on the wire for some time once you sent the “go for the light meter” packet.

It’s an USB receiver that can be attached up to 6 differents devices mouse, keyboards…. Pushing this same button while the application is running will makes the light meter activated: So the first task to accomplish is, unfortunately, to reverse engineer the program. Someone should write code to get the battery status and light meter from Linux: When pressed, a LED will light up on the keyboard:

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