Reverse Engineered Linux Driver for HP OMEN Macro Keys

I got a new laptop some time ago, an HP OMEN 17t-ck000. While it's a nice laptop with excellent build quality and performance, it has one problem: it's drivers under Linux are far from complete.No support for fan speed control. You can see the fan speed but that's it. In addition, HP's default fan control strategy is very agressive, in the sense that even with fan spin down enabled in BIOS, the fan keeps running with the CPU being around 40 degrees celsius and GPU being idle.Actually, NBFC can be used to control the fan speed by directly writing to EC registers, but in an unfortunate accident I lost my configuration file.I was trying NixOS on my new laptop when I set up NBFC. When the accident happened, I had removed NixOS from the laptop,...

Low-cost GeoDNS with NS1 and UptimeRobot/Freshping

Some parts of the content come from https://hostedtalk.net/t/connecting-uptime-robot-with-ns1-dns-api/3883。GoalI have quite a few VPSes around the world, but my website had been served by a single VPS in Los Angeles for a long time. Because I purchase VPSes from small providers for their specific routing configuration or low price, the network of this VPS can be unstable from time to time. Although it's rare, I had to manually point the DNS to another VPS in case of an outage and switch back after it's back up. Therefore, I want to serve my website with all my VPSes, and automatically reroute traffic to other VPSes if one VPS is down.Synchronizing website data is of no difficulty since I use Hexo, a static site generator....

NVIDIA GPU Passthrough on an Optimus MUXed Laptop

A year ago, to simultaneously browse webpages and write codes on my Arch Linux installation and use Windows to run tasks infeasible on Linux (such as gaming), I tried GPU passthrough on my Lenovo R720 gaming laptop. But since that laptop has an Optimus MUXless architecture (as mentioned in that post), its dedicated GPU doesn't have output ports, and the integrated GPU is in charge of all the displays. Therefore, severe limitations exist for that setup, and I eventually gave up on it.But now, I've purchased a new laptop. The HDMI output port on this laptop is directly connected to its NVIDIA dedicated graphics card, or in other words, it has an Optimus MUXed architecture. Since there is a way to make the virtual machine aware of a "monitor on the dedicated GPU",...
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I Moved My SSD to My New Laptop. This is What Happened To My Btrfs Data

What HappenedThe quality of my previous laptop (Lenovo Legion R720) isn't great. After 4 years of use, I swapped its keyboard once and replaced its failed mechanical hard drive with a SATA SSD. In addition, every time I opened its back panel, some plastic residue or even screws would fall out from the back panel or the hinge. These were strong indications that the laptop already had one foot in the grave. So I took advantage of a special deal and got a new laptop for cheap, and planned to migrate my data over to the new laptop.The operating system I daily drive, Arch Linux, sits on a Western Digital SN550 1T SSD I bought half a year ago (including the EFI boot partition and the Btrfs-formatted root partition). The usual procedure is to reinstall the operating system on the new laptop....
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NixOS Series 2: Basic Config, Nix Flake & Batch Deploy

List of NixOS Series Posts:NixOS Series 1: Why I fell in loveNixOS Series 2: Basic Config, Nix Flake & Batch DeployThis is the second post in my NixOS series and mainly focuses on:Basic format of NixOS config files and how to edit themFlake functionality of Nix package managerDeploy-RS deployment toolThis post assumes that you've installed NixOS with NixOS's official installation manual.Changelog2021-12-18: NixOS 21.11 still doesn't come with Flake functionality by default. Relevant information is updated.Basic configDuring NixOS's installation process, the nixos-generate-config tool should have generated an initial config file for you under /etc/nixos, with two files configuration.nix and hardware-configuration.nix. Ignore hardware-configuration.nix for the moment,...
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NixOS Series 1: Why I fell in love

List of NixOS Series Posts:NixOS Series 1: Why I fell in loveNixOS Series 2: Basic Config, Nix Flake & Batch DeployRight now, I'm gradually migrating my servers from Devuan Linux to NixOS. NixOS is a Linux distribution centered on a set of Nix configuration files located in /etc/nixos, which is used to install and configure the whole operating system. Because this configuration set defines ALL config files and packages on the system, as long as you use the same config files, you will absolutely get the same operating system every time you reinstall. Nix configuration language is also Turing complete, so you will be able to generate config files with Nix, no matter how complicated that software is.Another important feature of the Nix package manager is reproducible builds....

Replace Jenkins with Drone CI

Jenkins is a free and open-source CI/CD software widely used in all kinds of scenarios. The main advantage of Jenkins is its grand collection of plugins capable of all sorts of jobs, including deploying with SCP or Ansible, analyzing code with Cppcheck, and notifying job status with Telegram or DingTalk.Previously I also used Jenkins for automation of numerous jobs, like rebuilding my Docker images, deploying the blog you're visiting right now, and even auto sign-in to Genshin Impact.But Jenkins is a CI with a long history, and its predecessor Hudson was released back in 2005. Therefore, Jenkins executes commands directly when it comes to running jobs instead of using modern approaches such as containers....

Lookup Any Public WHOIS with this nginx-based Server

After I set up a DN42 WHOIS server with Nginx, I configured my DN42 Looking Glass to use this service. As my Looking Glass is capable of running as a Telegram bot, fellow group members are looking up WHOIS information of IPs and domains with it.But soon we noticed a problem. A significant part of members have applied for ASNs and IP ranges on the public Internet after they're familiar enough with DN42, and they're peering at Internet Exchange Points. Therefore, they often need to lookup some public Internet IPs, ASNs, and domains, yet none of the Telegram bots in our group can do so. It would be quite helpful for us if there exists a WHOIS server that proxies lookups to relevant registries.Proxying is exactly what Nginx is good at. With some modifications to Nginx,...

DN42 Experimental Network: Intro and Registration (Updated 2022-02)

DN42, aka Decentralized Network 42, is a large, decentralized VPN-based network. But unlike other traditional VPNs, DN42 itself doesn't provide any VPN exits, which means it doesn't allow you to bypass Internet censorships or unlock streaming services. On the contrary, the goal of DN42 is to simulate another Internet. It uses much of the technology running on modern Internet backbones (BGP, recursive DNS, etc), and is a great replica of a real network environment.In short, DN42 is:NOT suitable for users only seeking privacy protection or bypassing censorshipNOT suitable for users consuming large amounts of bandwidth/data, such as for unlocking streaming servicesIS suitable for users learning about networking, practicing configuration of servers and routers,...

Setting up DN42 WHOIS Server with Nginx

In my previous post, "Setting up Gopher Site with Nginx", I mentioned that the Gopher service is a byproduct of my original plan: modifying Nginx into a WHOIS server for DN42. This post will explore into details of that process.The WHOIS ProtocolFirst, we can find a WHOIS server to observe its response. Choose the WHOIS server for .pub domain as an example, and run telnet whois.nic.pub 43:# Type following line and hit enterlantian.pub# WHOIS server responded with:Domain Name: lantian.pubRegistry Domain ID: c69e5ccf9d834900be26f88fddc5c9e4-DONUTSRegistrar WHOIS Server: whois.dnspod.cnRegistrar URL: https://www.dnspod.cnUpdated Date: 2021-01-07T14:09:11ZCreation Date: 2016-10-23T08:36:41ZRegistry Expiry Date: 2029-10-23T08:36:41ZRegistrar: DNSPod, Inc....