Raymond P. Burkholder - Things I Do

I picked up an Intel Z890 chipset based Asus ProArt Z890-CREATOR WIFI motherboard. It has a relatively new Wifi card:

# lspci |grep -i wi-fi
85:00.0 Network controller: Intel Corporation Wi-Fi 7(802.11be) AX1775*/AX1790*/BE20*/BE401/BE1750* 2x2 (rev 1a)

With the Trixie based install, Bluetooth mice have a few problems with connecting and maintaining connection. Maybe these dmesg fail messages might point to a solution:

[    2.806746] iwlwifi 0000:85:00.0: firmware: failed to load iwlwifi-gl-c0-fm-c0-93.ucode (-2)
[    2.806750] iwlwifi 0000:85:00.0: firmware: failed to load iwlwifi-gl-c0-fm-c0-93.ucode (-2)
[    2.806751] iwlwifi 0000:85:00.0: Direct firmware load for iwlwifi-gl-c0-fm-c0-93.ucode failed with error -2
[    2.811678] iwlwifi 0000:85:00.0: firmware: failed to load iwl-debug-yoyo.bin (-2)
[    2.811681] iwlwifi 0000:85:00.0: firmware: failed to load iwl-debug-yoyo.bin (-2)

Linux Wireless Documentation suggests an updated firmware package from linux-firmware.git, and then an installation with:

# cp iwlwifi-*.{ucode,pnvm} /lib/firmware/

The following may be required to load the firmware during boot:

# update-initramfs -u -k all

I also upgraded the kernel from 6.12.6 to 6.12.19

/debian/pool/non-free-firmware/f/firmware-nonfree has latest packaged firmware, which may not be as recent as the git repository.

I used this to attempt to load a more recent firmware, but the kernel module seems to be limiting it to v92, and v93 is not available, for some reason. I hope the 6.13.8 series kernel, when it comes out of experimental might alleviate that.

# ln -s /lib/firmware/iwlwifi-gl-c0-fm-c0-96.ucode /lib/firmware/iwlwifi-gl-c0-fm-c0-93.ucode

Intel Wireless WiFi Link, Wireless-N, Advanced-N, Ultimate-N devices - iwlwifi mentions:

You may try to switch power management scheme from balanced (default) into active by adding the following to /etc/modprobe.d/iwlmvm.conf and reboot:

options iwlmvm power_scheme=1

The following command will identify the firmware files for which a driver is looking. In this case, the driver looks for -93, but it isn't in the firmware files:

# modinfo iwlwifi |grep firmware
...
firmware:       iwlwifi-gl-c0-fm-c0.pnvm
firmware:       iwlwifi-gl-c0-fm-c0-93.ucode
...
parm:           fw_restart:restart firmware in case of error (default true) (bool)

Additional references:

• gentoo linux iwlwifi
• kernel/git/firmware/linux-firmware-main.tar.gz

Two security vulnerabilities have been discovered in the OpenSSH secure networking utility suite that, if successfully exploited, could result in an active machine-in-the-middle (MitM) and a denial-of-service (DoS) attack, respectively, under certain conditions.

The vulnerabilities, detailed by the Qualys Threat Research Unit (TRU), are listed below -

• CVE-2025-26465 - The OpenSSH client contains a logic error between versions 6.8p1 to 9.9p1 (inclusive) that makes it vulnerable to an active MitM attack if the VerifyHostKeyDNS option is enabled, allowing a malicious interloper to impersonate a legitimate server when a client attempts to connect to it (Introduced in December 2014)
• CVE-2025-26466 - The OpenSSH client and server are vulnerable to a pre-authentication DoS attack between versions 9.5p1 to 9.9p1 (inclusive) that causes memory and CPU consumption (Introduced in August 2023)

Reddit has an elegant solution to the sound issue. Simply convert .mp3 files to .wav files. The .mp3 files in the TWS sound directory can be manipulated this way:

ffmpeg -i FILE.mp3 -acodec pcm_s16le -ar 44100 FILE.wav
# or as a oneliner for all at once
find . -iname '*.mp3' -exec sh -c 'ffmpeg -i $1 -acodec pcm_s16le -ar 44100 $1.wav' sh {} ';'

The sounds directory has voice based sounds. For the actual sound oriented sounds, you'll need to supply your own, or pull from the original distribution and convert. An example extraction from the article:

jar xf ~/Jts/1019/jars/jts4launch-1019.jar $(jar tf ~/Jts/1019/jars/jts4launch-1019.jar | grep '\.mp3$')

At the beginning of February, Lets Encrypt sent out an email saying they were no longer sending emails prior to certificate expiration. That means I'm going to have to track my own certificate expiration dates.

As an example command line to get things started:

</dev/null  openssl s_client -connect ounl.bm:443 -servername www.ounl.bm  | \
  openssl x509 -text -noout | grep 'Not After'

• </dev/null - send an empty connection (otherwise the client will not disconnect)
• -text - expands the content of the certificate
• -noout - does not show the encoded certificate

Some other links if I want to do this programmatically:

• cseelye/ssl.cpp - git gist to extract contents, notably a way to extract the expiry date/time
• RaymiiOrg/openssl-modern-cpp - Modern C++ OpenSSL examples
• libs/beast/example/websocket/server/coro-ssl/websocket_server_coro_ssl.cpp - maybe this beast example has the basics of acquiring the certificate, then the other code snippets can be used to decode it
• Boost ASIO SSL - this is probably an easier way to acquire a certificate and then use the other code segments to decode it

git clone https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
cd linux/
git checkout v6.1.113

cp /boot/config-$(uname -r) .config
make oldconfig
scripts/config --set-str SYSTEM_REVISION "$(git rev-parse --short HEAD)"
scripts/config --set-str SYSTEM_SERIAL "$(date +%s)"

git revert COMMITID
export CONCURRENCY_LEVEL=$(nproc)
fakeroot make -j$(nproc) deb-pkg LOCALVERSION=-revertCOMMITID
git reset HEAD^ --hard

On my ProxMox machine, I need a more dynamic way of handling containers rather than being limited to the LXC flavour offered by ProxMox. There was a question on reddit to which I supplied an answer about why to use full virtualization for Kubernetes vs running in a container. In summary:

• proxmox is a virtualization engine which enables LXC containers and QEMU/KVM guest virtual machines
• LXC containers are compartmentalized and share direct access to the kernel
• containers are used so as not to pollute your based proxmox installation with more packages and runtimes
• typically, you don't want to nest containers inside containers
• virtual machines run their own kernel/operating system, and are more secure (failure/security) and independent
• since k8s manages docker containers (not LXC containers), and you don't want to run containers of any fashion in containers of another fashion (docker inside lxc), you run a virtual machine with k8s to keep k8s packages and runtime separate from the core proxmox runtime environment
• hence the container inside virtual machine on hypervisor platform
• for security and compartmentalization

I built a basic LXC management container to take a look at talosctl, then used these instructions to perform a few tests:

apt update
apt upgrade
apt install --no-install-recommends curl
# based upon https://www.talos.dev/v1.9/talos-guides/install/talosctl/
curl -sL https://talos.dev/install | sh

# based upon https://kubernetes.io/docs/tasks/tools/install-kubectl-linux/
curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl.sha256"
echo "$(cat kubectl.sha256)  kubectl" | sha256sum --check
install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl
kubectl version --client

I ultimately removed this container, as I started reading the Getting Started Guide. But the above did generate the information that the lastest talosctl version is v1.9.1, which is useful for generating the iso image required.

.... more to come

Reference:

• Talos Getting Started
• construct/download images for control plane and worker nodes
• discusses qemu guest agent
• recommended resources

A couple months ago, the printer ink in my HP OfficeJet Pro 8620 ran low on most of the ink cartridges. Replacing all those cartridges would cost a significant fraction of the replacement cost of a new printer/scanner. I went looking for some cartridges which might cost less. I did find some on Amazon, installed them, and was successful in printing.

A month or two later, I needed to print again (Yes, I don't print all the time). At this point, the printer display showed:

The printhead appears to be missing, not detected, or
incorrectly installed.
Error Code 0xc19a0023

HP has been pretty loud about not wanting non-branded cartridges installed in their printers - it obviously reduces their own recurring revenue model. It may or may not be a conspiracy that the printer enters this mode on purpose, or it could be that the printhead suddenly failed. No one but HP knows with these kind of opaque error messages and lack of any suitable diagnostics.

After expressing this problem to the third party cartridge supplier, they are sending some new cartridges which they say will make this problem go away. hmm... We'll see.

So, now that I have an over-designed scanner/paper-weight, it is time to go look for alternative solutions.

Given this whole lock-in with cartridges, I'm not in the mood for anyone's cartridges. They seem costly for no added reason other than some additional profit. Fortunately, there are various brands and models on the market which utilize reservoirs - probably due to consumer demand for just the reasons I no longer like/appreciate priinter cartridges.

I went shopping for some non-HP brand. The Best All-in-One Printers for 2025 seemed to be a good starting point. I ended up looking at the Canon models. There are GX20xx, GX40xx, GX60xx all-in-one models. Even at the higher end models, Canon can't seem to make a decent all-in-one model with 'everything' in it. After comparing a bunch of them, I decided on the GX2020, as it seemed to be a newer update, had an ADF for scan and a duplexer for print. Flat scan can only go to about 8.5" x 11", unlike the HP which could do larger.

The next challenge is working with Debian Linux, and having the printer/scanner on a wifi subnet different from my workstation. Typical printer locator utilities utterly fail in this scenario.

For installing the printer, they do have a package which can be installed with the Debian package manager: cnijfilter2-6.70-1-deb.tar.gz. This can be installed with (remember the service restart):

sudo dpkg -i cnijfilter2_6.80-1_amd64.deb
sudo service cups restart

Cups printer utilities could then be used to specify the printer by ip address and set it with the PASSTHRU printer queue mode.

The scanner mode wasn't as 'easy' to configure. After installing the Canon package for the scanner, i had to find a Debian Wiki for SaneOverNetwork which said to modify the /etc/sane.d/pixma.conf file and add a line like (there are examples in the file):

bjnp://ip-address

However, the following error message occurred:

# scanimage -L
[17:44:27.140613] [bjnp] udp_command: ERROR - no data received (timeout = 10000)
[17:44:27.140719] [bjnp] bjnp_init_device_structure: Cannot read mac address, skipping this scanner

When looking for more assistance, there are references to ThierryHFR / scangearmp2. This is someone who has reverse engineered Canon's protocols, wrapped their binaries, and built something which Canon should have done in the first place.

A word of warning, don't try and build your own from the repository. The instructions aren't so clear, and maybe incorrect. Instead, go directly to the linked repositories, download, and install what you need. Do this for both the print and the scanner drivers.

I did a look at the files in the package:

dpkg -c scangearmp2_4.80-1_amd64.deb

There is a file called /etc/sane.d/canon_pixma.conf which provides the ability of providing the ip address of the printer (which I set statically in dhcp based upon the printer's mac address).

My scanner programs, like gscan2pdf, worked right away.

Are there printer / scanners with better Linux support, and with the 'ultimate' combination of ADF/Flatbed scanning with Colour printing with duplex capability?

• CMake: the Good, the Bad, the Weird - ... strongly recommend for any developers who are learning or struggling with CMake to purchase Professional CMake -- I have found it very helpful in explaining things where most other resources haven't, and it is consistently updated with new major versions of CMake.

Practical Evaluation of Low-Frequency Vibration Energy Harvesting for Creating Green RFID and IoT Devices

One of the main limitations for the development and deployment of many Green Radio Frequency Identification (RFID) and Internet of Things (IoT) systems is the access to energy sources. In this aspect batteries are the main option to be used in energy constrained scenarios, but their use is limited to certain cases, either because of the constraints imposed by a reduced-form factor, their limited lifespan, or the characteristics of the environment itself (e.g. operating temperature, risk of burning, need for fast response, sudden voltage variations). In this regard, supercapacitors present an interesting alternative for the previously mentioned type of environment, although, due to their short-term capacity, they must be combined with an alternative energy supply mechanism. Energy harvesting mechanisms, in conjunction with ultra-low-power electronics, supercapacitors and various methods to improve the efficiency of communications, have enabled the emergence of battery-less passive electronic devices such as sensors, actuators or transmitters. This paper presents a novel analysis of the performance of an energy harvesting system based on vibrations for Green RFID and IoT applications in the field of maritime transport. The results show that the proposed system allows for charging half of a 1.2 F supercapacitor in about 72 minutes, providing a stable current of around 210 uA and a power output of 0.38 mW.

Artificial Neural Network and Deep Learning: Fundamentals and Theory

"Artificial Neural Network and Deep Learning: Fundamentals and Theory" offers a comprehensive exploration of the foundational principles and advanced methodologies in neural networks and deep learning. This book begins with essential concepts in descriptive statistics and probability theory, laying a solid groundwork for understanding data and probability distributions. As the reader progresses, they are introduced to matrix calculus and gradient optimization, crucial for training and fine-tuning neural networks. The book delves into multilayer feed-forward neural networks, explaining their architecture, training processes, and the backpropagation algorithm. Key challenges in neural network optimization, such as activation function saturation, vanishing and exploding gradients, and weight initialization, are thoroughly discussed. The text covers various learning rate schedules and adaptive algorithms, providing strategies to optimize the training process. Techniques for generalization and hyperparameter tuning, including Bayesian optimization and Gaussian processes, are also presented to enhance model performance and prevent overfitting. Advanced activation functions are explored in detail, categorized into sigmoid-based, ReLU-based, ELU-based, miscellaneous, non-standard, and combined types. Each activation function is examined for its properties and applications, offering readers a deep understanding of their impact on neural network behavior. The final chapter introduces complex-valued neural networks, discussing complex numbers, functions, and visualizations, as well as complex calculus and backpropagation algorithms. This book equips readers with the knowledge and skills necessary to design, and optimize advanced neural network models, contributing to the ongoing advancements in artificial intelligence.

During the early days of Debian Linux, one could get away with a 100mb boot partition. With the explosion of included firmware files in the initramfs file, the boot directory needs to be 500mb or even 1gb in size. I have a couple older machines I have not yet rebuilt, which have limited size. I resort to copying various initrd.img files in and out as I upgrade kernels or boot into older versions of the kernel.

Sometimes I have forgotten to properly copy an image back into /boot and run update-grub. When I do that, I have to boot into grub and run the grub command line. Some commands that I run are as follows:

Set a variable so when requesting help, you can page through entries:

grub> set pager=1

List the various mount points:

grub> ls

List the files in a particular mount point

grub> ls (hd0,msdos2)/root

Startup commands, depending upon where linux and initrd files are found:

grub> set root=(hd0,msdos2)
grub> linux (hd0,msdos1)/vmlinux-6.1.0-15-amd64 root=LABEL=main
grub> initrd (hd0,msdos2)/root/initramfs/initrd.img-6.1.0-15-amd64
grub> boot

Classical Machine Learning: Seventy Years of Algorithmic Learning Evolution

Machine learning (ML) has transformed numerous fields, but understanding its foundational research is crucial for its continued progress. This paper presents an overview of the significant classical ML algorithms and examines the state-of-the-art publications spanning twelve decades through an extensive bibliometric analysis study. We analyzed a dataset of highly cited papers from prominent ML conferences and journals, employing citation and keyword analyses to uncover critical insights. The study further identifies the most influential papers and authors, reveals the evolving collaborative networks within the ML community, and pinpoints prevailing research themes and emerging focus areas. Additionally, we examine the geographic distribution of highly cited publications, highlighting the leading countries in ML research. This study provides a comprehensive overview of the evolution of traditional learning algorithms and their impacts. It discusses challenges and opportunities for future development, focusing on the Global South. The findings from this paper offer valuable insights for both ML experts and the broader research community, enhancing understanding of the field's trajectory and its significant influence on recent advances in learning algorithms.

An Overview of Integration of the Virtualization of Network Functions in the Context of Information Centric Networks

Nowadays, the new network architectures with respect to the traditional network topologies must manage more data, which entails having increasingly robust and scalable network structures. As there is a process of growth, adaptability, and change in traditional data networks, faced with the management of large volumes of information, it is necessary to incorporate the virtualization of network functions in the context of information content networks, in such a way that there is a balance between the user and the provider at cost level and profit, the functions on the network. In turn, NFVs (Network Functions Virtualization) are considered network structures designed based on IT virtualization technologies, which allow virtualizing of the functions that can be found in the network nodes, which are connected through routing tables, which allows offering communication services for various types of customers. Therefore, information-centric networks (IC, unlike traditional data networks which proceed to exchange information between hosts using data packets and TCP/IP communication protocols, use the content of the data for this purpose where the data travels through the network is stored in a routing table located in the CR (Content Router) of the router temporality to be reused later, which allows for reducing operation costs and capital costs . The purpose of this work is to analyze how the virtualization of network functions is integrated into the field of information-centric networks. Also, the advantages and disadvantages of both architectures are considered and presented as a critical analysis when considering the current difficulties and future trends of both network topologies.

OpenLogParser: Unsupervised Parsing with Open-Source Large Language Models

Log parsing is a critical step that transforms unstructured log data into structured formats, facilitating subsequent log-based analysis. Traditional syntax-based log parsers are efficient and effective, but they often experience decreased accuracy when processing logs that deviate from the predefined rules. Recently, large language models (LLM) based log parsers have shown superior parsing accuracy. However, existing LLM-based parsers face three main challenges: 1)time-consuming and labor-intensive manual labeling for fine-tuning or in-context learning, 2)increased parsing costs due to the vast volume of log data and limited context size of LLMs, and 3)privacy risks from using commercial models like ChatGPT with sensitive log information. To overcome these limitations, this paper introduces OpenLogParser, an unsupervised log parsing approach that leverages open-source LLMs (i.e., Llama3-8B) to enhance privacy and reduce operational costs while achieving state-of-the-art parsing accuracy. OpenLogParser first groups logs with similar static text but varying dynamic variables using a fixed-depth grouping tree. It then parses logs within these groups using three components: i)similarity scoring-based retrieval augmented generation: selects diverse logs within each group based on Jaccard similarity, helping the LLM distinguish between static text and dynamic variables; ii)self-reflection: iteratively query LLMs to refine log templates to improve parsing accuracy; and iii) log template memory: stores parsed templates to reduce LLM queries for improved parsing efficiency. Our evaluation on LogHub-2.0 shows that OpenLogParser achieves 25% higher parsing accuracy and processes logs 2.7 times faster compared to state-of-the-art LLM-based parsers. In short, OpenLogParser addresses privacy and cost concerns of using commercial LLMs while achieving state-of-the-arts parsing efficiency and accuracy.

Amman City, Jordan: Toward a Sustainable City from the Ground Up

The idea of smart cities (SCs) has gained substantial attention in recent years. The SC paradigm aims to improve citizens' quality of life and protect the city's environment. As we enter the age of next-generation SCs, it is important to explore all relevant aspects of the SC paradigm. In recent years, the advancement of Information and Communication Technologies (ICT) has produced a trend of supporting daily objects with smartness, targeting to make human life easier and more comfortable. The paradigm of SCs appears as a response to the purpose of building the city of the future with advanced features. SCs still face many challenges in their implementation, but increasingly more studies regarding SCs are implemented. Nowadays, different cities are employing SC features to enhance services or the residents quality of life. This work provides readers with useful and important information about Amman Smart City.

# dd if=Downloads/iso/debian-testing-amd64-netinst.iso of=/dev/sda bs=1M status=progress conv=fdatasync

'fdatasync' is equivalent to running 'sync' as a second command

watch kern.log to determine on which drive the USB is mounted when inserted

ensure that the USB is not auto-mounted by any other application or service

For example, (to name just a few items) a stock option pricing model is useless without:

• holiday calendars
• ex dividend dates
• interest rate curves
• real-time stock prices
• corporate actions database