Arch Linux learning notes ( Arch Wiki: https://archlinux.org/ )

1. okular pdf注解：F6 https://docs.kde.org/stable5/en/okular/okular/annotations.html

2. GitHub markdown：https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax
   markdown换行：末尾打两个空格

3. Update grub after installing custom kernel:

   $ sudo grub-mkconfig -o /boot/grub/grub.cfg
   

4. C++中矩阵要初始化。如定义一个矩阵：

   double data[row][column];

   不初始化会出现Bus error。初始化，给每个元素赋一个初始值：

   for(int i=0;i<=row-1;i++)
    {
      for(int j=0;j<=column-1;j++)
      {
        data[i][j]=0;
      }
    }

5. linux上编译Geant4（已在opensuse、wsl2、Arch Linux上测试）:

   $ cmake -DCMAKE_INSTALL_PREFIX=/path/to/install \
      -DGEANT4_USE_OPENGL_X11=ON \
      -DGEANT4_USE_RAYTRACER_X11=ON \
      -DGEANT4_INSTALL_DATA=ON \
      -DGEANT4_INSTALL_DATADIR=/path/to/datasets \
      -DGEANT4_USE_QT=ON \
      -DGEANT4_BUILD_MULTITHREADED=ON \
      /path/to/src
   

6. Opensuse tumbleweed下nvidia导致休眠恢复失败：在/etc/default/grub中添加内核启动参数nouveau.blacklist=1

7. 高分屏再x11下显示字体图标过小（如surface pro 7）：kde下，在设置中将缩放改为200%，然后在~/.xprofile中

8. pacman更新时出现key相关的问题（如无法导入、corrupted）：删除/etc/pacman.d/gnupg,再pacman-key --init

   # rm -rf /etc/pacman.d/gnupg
   # pacman-key --init
   

9. git本地仓库push到远程：

   git config --global user.name "yourname"
   git config --global user.email [email protected]
   git add <filename>
   git commit -m "***"
   git push origin main
   

10. git使用ssh进行clone和push，publickey添加到GitHub：

    ssh-keygen -t rsa -C "[email protected]"
    git clone [email protected]:lcyf9102s/ArchLinux-Learning.git
    

11. 给linux kernel source手动打patch：

    patch -p2 < name.patch
    

    P.s. 要输入对应需要打patch的文件的相对或绝对路径

12. wayland下Geant4可视化窗口无显示问题： 运行前添加环境变量：XDG_SESSION_TYPE=x11

    $ export XDG_SESSION_TYPE=x11
    

13. VSCode factional scaling blurring issue fix for HiDPI Display (wayland):

    code --enable-features=UseOzonePlatform,WaylandWindowDecorations --ozone-platform=wayland
    

14. Arch Linux 使用systemd-boot引导时开启secure boot (surface pro)：https://github.com/linux-surface/linux-surface/wiki/Secure-Boot