Cygnet Tech Blog

 My Acer Aspire Z3-605 AIO PC speaker has buzzing noise. So I decided to replace the speaker. Unscrew 8 screw from the back side. Total 8 screw at back side Pry up starting from below silver color area. Take out speaker You can see the vibrating membrane or sound film has melted. I search in ebay and the price is about USD $19. So I decided to open and see whether I can just replace the speaker only.  The size of the speaker is 24mm diameter and 10mm thickness. I don't see any label or model no on the back side. I search in google about the wattage of the speaker found it's 3 watts. Then I measured with multimeter and it's 4 ohm. So I searched in China site and found the speaker about SGD $2.  So I just purchased 2 pieces and approximately 2 weeks time to reach to Singapore.  To be continued

First issue was IP:6443 was refused. Recently I build kubernetes 3 nodes clusters and forget to change IP as static. After a few days the master node IP was changed and I received the following error while running kubectl command. myo@master-node:~$ kubectl get nodes The connection to the server 192.168.1.132:6443 was refused - did you specify the right host or port? I found the following command solved the issue. sudo -i swapoff -a exit strace -eopenat kubectl version Here is the result. myo@master-node:~$ sudo -i root@master-node:~# swapoff -a root@master-node:~# exit logout myo@master-node:~$ strace -eopenat kubectl version openat(AT_FDCWD, "/sys/kernel/mm/transparent_hugepage/hpage_pmd_size", O_RDONLY) = 3 openat(AT_FDCWD, "/etc/passwd", O_RDONLY|O_CLOEXEC) = 3 Client Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.5", GitCommit:"e6503f8d8f769ace2f338794c914a96fc335df0f", GitTreeState:"clean", Bui...

 Recently I have project that needs to extend IBM x3650 M4 8 bay HDD expander and the kit in online shopping such as ebay, aliexpress are very expensive due to the card has SAS module. The picture looks like below cost around USD $300  Alternatively , I found cheaper 8 x HDD expander and the cable with cheaper price and the LSI 9211-8i (Dell H310) will cost you around $60 which is cheaper then the expander kit. But the problem is the power cable, you can't buy power splitter from above kit. So I bought two single power cable and solder to 14 pin 5557 molex connector.  14 pins molex, this one goes to motherboard. 16 pins goes to 8 bay expander. You need to remove the molex pin with tools mentioned below. Before I remove molex cable from 14pin 5557 connector, I use multimeter to test the connectivity from end to end. I have removed one pin by one pin and solder to each other the attached back to the first 14 pin molex connector.

Recently I have installed WSL1 on my Windows 10 (1909) laptop and wanted to try Rust compiler on Ubuntu 20.04. but I have issue with installation. So this GitHub link is working fine. https://github.com/rust-lang/rustup/issues/2245 export RUSTUP_IO_THREADS=1 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh info: downloading installer Welcome to Rust! This will download and install the official compiler for the Rust programming language, and its package manager, Cargo. Rustup metadata and toolchains will be installed into the Rustup home directory, located at:   /home/myubu/.rustup This can be modified with the RUSTUP_HOME environment variable. The Cargo home directory located at:   /home/myubu/.cargo This can be modified with the CARGO_HOME environment variable. The cargo, rustc, rustup and other commands will be added to Cargo's bin directory, located at:   /home/myubu/.cargo/bin This path will then be added to your PATH environment variable by modifying th...

How to update DCS 6105 BIOS to Dell Power Edge c6105 BIOS in order to support AMD Opteron 4300 series CPU. Download Dell PowerEdge c6105 BIOS version 2.2.0 which is the first version that support Opteron 4200 and 4300 series. Download  PEC6105BIOS020200.exe  floppy image and extract to your bootable DOS USB disk. You just need to use 6105v220.ROM image to flush  BIOS. You need to download AMI bios utility AFUDOS.exe version 4.4 and put into bootable USB disk. You can use rufus to make bootable usb. just select FreeDOS before you click Start. After booting to the USB, run the following command afudos  6105v220 .rom /P /B /N /C /E /K /X  Below image is before upgrade , version is S2G_3A21. Build Date: 06/03/11. After upgrade, the version become 2.2.0. You can see the process or Opteron 4164 EE. You have to use Opteron 4100 series CPU to upgrade the BIOS. After booting to windows, i was able to directly upgrade to 2.5.0 by running the fi...

I have issue with launching IPMI after java JRE version update 1.8.131. "Error: unsigned application requesting unrestricted access to system the following resource is signed with a weak signature algorithm MD5withRSA and is treated as unsigned" The resolution is you can comment out java.security under C:\Program Files\Java\jre1.8.0_131\lib\security #jdk.jar.disabledAlgorithms=MD2, MD5, RSA keySize < 1024 you will able to launch JNLP file without issue.