HP Pavilion dm4双启动（Dual boot）配置下外接VGA显示器Ubuntu仅显示logo无法正常工作求助

Hey there, let's troubleshoot this issue step by step since your laptop screen's out and you're stuck on the Ubuntu jellyfish logo with the VGA display. Don't worry, we can work through this even without seeing the full desktop initially:

1. Force Ubuntu to output to the VGA display via GRUB #

Your system might still be trying to send video to the broken laptop screen instead of the VGA port. Let's adjust the boot parameters:

• When powering on the laptop, hold down the Shift key right after turning it on (this brings up the GRUB boot menu—you may need to try a few times if you miss the window).
• Use arrow keys to select your Ubuntu entry, then press e to enter edit mode.
• Look for the line starting with linux (it’ll have a long string ending with quiet splash).
• Add one of these parameters at the end of that line:
  • nomodeset: This temporarily disables the default graphics driver, which often fixes stuck logo issues. You can replace quiet splash with quiet splash nomodeset if needed.
  • video=VGA-1:1920x1080@60: If you know your external monitor’s resolution and refresh rate, plug those values in (e.g., 1366x768@60 for a common monitor). This forces output directly to the VGA port.
• Press Ctrl + X to boot with these settings. If it works, you’ll reach the Ubuntu desktop on your VGA display.

2. Check your Ubuntu version (once you’re in the desktop) #

Open the terminal with Ctrl + Alt + T and run this command:

lsb_release -a

This will show your Ubuntu version (like 20.04 LTS or 22.04 LTS), which helps install the right graphics drivers later.

3. Install proper graphics drivers to fix persistent issues #

HP Pavilion dm4 models usually use Intel integrated graphics (sometimes AMD discrete graphics). Here’s how to get the right drivers:

• Open the Software & Updates app (search for it in the applications menu).
• Switch to the Additional Drivers tab. Wait a few seconds for it to scan available drivers.
• Select the recommended proprietary driver (if available) or the latest stable open-source driver for your graphics card.
• Click Apply Changes, then restart your laptop. After rebooting, Ubuntu should automatically detect and use your VGA display correctly.

4. If you’re still stuck on the logo: #

• Try adding the parameter acpi=off to the linux line in GRUB edit mode (note: this disables some power management features, so it’s a temporary test to see if ACPI is causing the problem).
• After booting, use your laptop’s display switch shortcut (usually Fn + F4 or Fn + F5—look for a monitor icon on the function keys) to cycle through display modes (external only, duplicate, etc.). Sometimes the system boots successfully but just isn’t sending video to the VGA port.

Hopefully one of these steps gets your Ubuntu running smoothly on the external display!

备注：内容来源于stack exchange，提问作者GlobalMarketing