Ubuntu分辨率卡在1024x768无法设置为1366x768的解决求助

Hey there! Let's sort out this resolution issue together—you definitely don't need to jump back to Windows right away. Your 4th-gen Intel Core i3 with HD 4400 graphics should fully support 1366x768 on Ubuntu, so let's walk through some practical fixes step by step:

• 第一步：确认Intel显卡驱动状态
  First up, let's make sure your Intel graphics driver is properly installed and running. Open the terminal (press Ctrl+Alt+T) and run this command to check your video hardware info:
  lshw -c video
  Look for lines mentioning "Intel HD Graphics 4400" and verify if the driver shows up as i915 (that's the correct open-source driver for your card). If you don't see the driver listed, install the official Intel video package with:
  sudo apt install xserver-xorg-video-intel
  Reboot your system after installation and check the resolution again.

• 第二步：用xrandr手动添加1366x768分辨率
  It sounds like you tried custom resolution before but hit a snag—let's do this properly:

  1. Generate the resolution mode parameters by running:
     cvt 1366 768
     You'll get output like this (copy the entire Modeline line except the # comment):

     1366x768 59.80 Hz (CVT) hsync: 47.72 kHz; pclk: 85.25 MHz #

     Modeline "1366x768_60.00" 85.25 1366 1440 1576 1784 768 771 781 798 -hsync +vsync

  2. Create the new resolution mode using the copied details:
     xrandr --newmode "1366x768_60.00" 85.25 1366 1440 1576 1784 768 771 781 798 -hsync +vsync
  3. Find your HDMI display's name by running xrandr—it'll look something like HDMI-1 or HDMI-0. Then add the new mode to this display:
     xrandr --addmode HDMI-1 "1366x768_60.00"
  4. Finally, apply the resolution:
     xrandr --output HDMI-1 --mode "1366x768_60.00"
     If this works, make the setting permanent by adding these three xrandr commands to your ~/.profile file. Open it with nano ~/.profile, paste the commands at the end, save (Ctrl+O, press Enter) and exit (Ctrl+X). It'll load automatically on next boot.

• 第三步：强制加载显示器EDID（如果xrandr失败）
  Sometimes Ubuntu doesn't correctly read your monitor's EDID info (which tells the system supported resolutions) over HDMI. Here's how to fix that:

  1. Locate your monitor's EDID file with:
     find /sys -name edid
     The path might be something like /sys/class/drm/card0-HDMI-A-1/edid.
  2. Create a folder for custom EDID files and copy the EDID there:
     sudo mkdir -p /lib/firmware/edid
sudo cp /sys/class/drm/card0-HDMI-A-1/edid /lib/firmware/edid/1366x768.edid
  3. Edit the GRUB config to force using this EDID:
     sudo nano /etc/default/grub
     Find the line starting with GRUB_CMDLINE_LINUX_DEFAULT and add the EDID parameter inside the quotes, like:
     GRUB_CMDLINE_LINUX_DEFAULT="quiet splash drm.edid_firmware=HDMI-A-1:edid/1366x768.edid"
  4. Update GRUB and reboot:
     sudo update-grub
sudo reboot

Most of the time, the first two steps will get your 1366x768 resolution working. Don't give up on Ubuntu just yet—Intel graphics have great open-source support, so this is just a small hiccup!

备注：内容来源于stack exchange，提问作者Md Shamim