Category Archives: Computer/Technical

Ubuntu/Fedora PXE Boot

Posted by on 2023/04/16 No comments

Before setting up Ubuntu/Fedora PXE boot, it needs to prepare several items on your PXE server:

  • * The Ubuntu/Fedora rootfs on tftp/nfs server:
    It can refer to the my article MIPS/ARM64 Debian/Ubuntu debootstrap for building the Ubuntu rootfs.
    If want to build the Fedora rootfs, it can install a new system on qemu and copy it from the qcow2 image.
  • NFS Server:
    Assume the rootfs for Ubuntu is on /nfs/ubuntu2204 and Fedora 36 is on /nfs/fedora36.
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Unable to complete install: internal error: cannot load AppArmor profile libvirt

Posted by on 2023/03/05 No comments

ARM64 系統 + Ubuntu 20.04 裝 virt-manager 碰到一些問題，第一關是碰到 libvirtd 被 mask 掉了，這個簡單

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Stable Diffusion webui CPU only on ARM64 Platform

Posted by on 2023/03/04 No comments

Stable Diffusion webui is a web service based on Gradio library for Stable Diffusion. The installation process can automatically set up the environment and install Stable Diffusion, which can save a lot of time. However, it requires an NVIDIA or AMD GPU to install it. If you want to install Stable Diffusion WebUI without a GPU, some modifications are necessary.

Using a CPU to run Stable Diffusion can be painful, so this article is just for fun.

Platform is Ampere Altra Mt. Collins system with 2 Ampere Altra CPU, total 160 cores.
OS: ubuntu 22.04.02 LTS
Seems Stable Diffustion webui needs python 3.10, so, ubuntu 22.04 is good choice.

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Raspberry Pi Pico W + PicoOLED 2.23 + Arduino 顯示天氣預報降雨機率和空污指數

Posted by on 2023/01/15 No comments

有時候人生就是不能亂買東西，一步錯步步錯，然後就弄了這個出來，當然不是圖中大螢幕的屋內屋外溫濕度狀況，而是左上角小小的溫度預測

至於怎麼來的，一切都要從邪惡的阿媽爽60元免運說起，因為60元免運，有時候就會將有些小東西放到購物車內，因為有時候即使加了稅金，從美亞（美國亞馬遜Amazon）網站買東西還比淘寶買便宜，更不要說很多東西只有美亞有，這時候小東西湊60元免運頗方便的

原來是我有二張 Arduino 的板子，本來也只是接來做溫度偵測，也沒有什麼用，想說接個小螢幕顯示一下天氣預報，但是這東西又不是很必要，就想想而已，就隨便找了一個看起來順眼的 SPI LCD 和 OLED （想說比較省電）就放到購物車了，上個月美國很多東西都特價，兩雙鞋子才 30 元美金，這塊 OLED 好像也才 15 上下，就被拿來湊運費了，沒想到我手上並沒有東西可以接

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Build CentOS 8 Kernel from Source on ARM64 Platform

Posted by on 2022/12/08 No comments

Due to CentOS website document cannot provide a simple instruction to build CentOS 8 stream with some easy steps. So, I make a note to record these procedures about how to build it.

Detail description and instruction, please refer to CentOS document, but if you have read the document and still don’t know how to do that, it can follow my instruction to build the kernel from CentOS 8 kernel source.

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Kubuntu Left Mouse Button Suddenly Stopped Working

Posted by on 2022/12/05 No comments

It’s a strange problem, after login kubuntu/ubuntu system, after a while, the mouse click won’t work anymore suddenly. but it still can move. original post is for ubuntu 18.04, but it’s also work on my ubuntu 22.04

How to solve it temporary ? reload the psmouse driver 

sudo modprobe -r psmouse

Suppose the ACPI driver or UEFI cause this issue, but not easy to find it out.

ref.
[SOLUTION] Left mouse button suddenly stopped working on Ubuntu 18.04

FF14 中華電信 LAG 問題

Posted by on 2022/11/28 No comments

看到有人說改 MTU 可以解決 FF14 FFXIV 的延遲問題，【心得】中華電信FF14晚間卡頓解決方式
這個之前有看到過，但是忘了下去試

猜測原理應該藉由中華電信內部設定會讓小封包先通行的設定，達到穩定 ping 值的目地

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Facebook 擋廣告

Posted by on 2022/11/11 No comments

只有 Desktop 加上 Chrome/Edge 可以用
用 ublock origin 擋，還可以順便擋 Youtube 的廣告

加上自定的設定

www.facebook.com##div[id^=hyperfeed_story_id_]:has(span[data-ft="{\"tn\":\"j\"}"])
www.facebook.com##.pagelet-group .pagelet:has(a:has-text(Sponsored))
www.facebook.com##.pagelet-group .pagelet:has(a:has-text(Create ad))

banana.plurk.com

另一個是臉書推薦廣告
先裝 Tampermonkey
再利用 Tampermonkey 安裝這個腳本(script) FB 贊助之殺手 (FB Sponsored Killer)

ref.
回來用 uBlock Origin 擋 Facebook 廣告

multichase on Centos 8 Compile Issue

Posted by on 2022/11/08 No comments

muttichase is a google open source tool which can run latency, bandwidth and loader-latency tool,
it can support both x86 and ARM64 platforms.
but it will have compile error on CentOS 8

root cause is this package needs static lib support, but regular CentOS doesn’t have it. 

# make                                                                             cc -g -O3 -static -pthread  multichase.o permutation.o arena.o util.o  -lrt -lm -o multichase
/usr/bin/ld: cannot find -lrt                                                                                 /usr/bin/ld: cannot find -lm                                                                                  /usr/bin/ld: cannot find -lpthread
/usr/bin/ld: cannot find -lc                                                                                  collect2: error: ld returned 1 exit status                                                                    make: *** [<builtin>: multichase] Error 1
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幫 NVME SSD 穿衣服

Posted by on 2022/11/08 No comments

最近自已用的電腦一直莫名其妙的重開機，檢查了半天也沒看到什麼特別的狀況，猜測有可能是因為最近電腦搬地方，天氣又涼一點我就沒開冷氣，電腦通風不良

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