Ask Question Forum:
Model Library:2025-02-08:A.I. model is online auto reply
C
O
M
P
U
T
E
R
2
8
Show
#
ASK
RECENT
←
- Underline
- Bold
- Italic
- Indent
- Step
- Bullet
- Quote
- Cut
- Copy
- Paste
- Table
- Spelling
- Find & Replace
- Undo
- Redo
- Link
- Attach
- Clear
- Code
Below area will not be traslated by Google,you can input code or other languages
Hint:If find spelling error, You need to correct it,1 by 1 or ignore it (code area won't be checked).
X-position of the mouse cursor
Y-position of the mouse cursor
Y-position of the mouse cursor
Testcursor
caretPos
Attachment:===
Asked by test test
at 2026-08-28 19:19:16
ModifyPoint:500 Replies:2 POST_ID:829437USER_ID:12446
Topic:
centos9;bios;apache
how to solve when I reboot my centos9 server that will be hanged at probing edd=off
I need to change console=ttySO to tty0 to solve the issue in grub boot menu.
.
I want to solve it permement without going into grub menu every time I need to reboot
Please advise
Expert: rcschroeder replied at 2026-08-28 19:26:39
The issue you're experiencing with CentOS 9 hanging at "probing edd=off" is a known problem, and modifying the `console=ttyS0` setting to `console=tty0` in the GRUB boot menu is a common solution. However, it's not a permanent fix, as the GRUB menu will appear every time you reboot.
To achieve a permanent solution without accessing the GRUB menu every time, you can try the following steps:
1. **Update your BIOS**: Ensure your BIOS is up-to-date, as newer versions often include fixes for this issue. Check with your motherboard manufacturer for the latest BIOS version and follow their instructions for updating.
2. **Disable Secure Boot**: Secure Boot can sometimes cause issues like this. Try disabling it in the BIOS settings and see if it resolves the problem.
3. **Update your GRUB configuration**: While the issue is not directly related to GRUB, updating the configuration might help. Run the following commands to update GRUB:
```bash
grub2-mkconfig -o /boot/grub2/grub.cfg
grub2-install --target=i386-x86_64 --relocation-x86_64 --removable /dev/sda
```
Replace `/dev/sda` with the actual device containing your root partition.
4. **Set `console=tty0` permanently**: To set `console=tty0` permanently, you can modify the `/etc/default/grub` file to include the following line:
```bash
GRUB_CMDLINE_LINUX_DEFAULT="console=tty0"
```
Then, run the following command to update GRUB:
```bash
grub2-mkconfig -o /boot/grub2/grub.cfg
grub2-install --target=i386-x86_64 --relocation-x86_64 --removable /dev/sda
```
Replace `/dev/sda` with the actual device containing your root partition.
5. **Use a BIOS firmware update tool**: Tools like `efibootmgr` or `grubutil` can help you update the BIOS firmware and configure the GRUB settings. For example:
```bash
efibootmgr -c -d /dev/sda -p 1 -n "CentOS 9" -l "x02x00x00x00x00x00x00x00" -w /boot/grub2/grub.cfg
```
This command updates the GRUB settings and loads the `grub.cfg` file. Replace `/dev/sda` with the actual device containing your root partition.
6. **Check for BIOS-specific settings**: Some BIOSes have specific settings that can cause this issue. Check your BIOS documentation to see if there are any settings that need to be adjusted.
7. **Try a different kernel**: If you're using a custom kernel, try loading a different kernel or a kernel from a different distribution to see if the issue persists.
8. **Reinstall GRUB**: If all else fails, you can try reinstalling GRUB:
```bash
grub2-install --target=i386-x86_64 --relocation-x86_64 --removable /dev/sda
grub2-mkconfig -o /boot/grub2/grub.cfg
```
Replace `/dev/sda` with the actual device containing your root partition.
If none of these steps resolve the issue, you may want to consider seeking further assistance from a Linux expert or the CentOS community.
To achieve a permanent solution without accessing the GRUB menu every time, you can try the following steps:
1. **Update your BIOS**: Ensure your BIOS is up-to-date, as newer versions often include fixes for this issue. Check with your motherboard manufacturer for the latest BIOS version and follow their instructions for updating.
2. **Disable Secure Boot**: Secure Boot can sometimes cause issues like this. Try disabling it in the BIOS settings and see if it resolves the problem.
3. **Update your GRUB configuration**: While the issue is not directly related to GRUB, updating the configuration might help. Run the following commands to update GRUB:
```bash
grub2-mkconfig -o /boot/grub2/grub.cfg
grub2-install --target=i386-x86_64 --relocation-x86_64 --removable /dev/sda
```
Replace `/dev/sda` with the actual device containing your root partition.
4. **Set `console=tty0` permanently**: To set `console=tty0` permanently, you can modify the `/etc/default/grub` file to include the following line:
```bash
GRUB_CMDLINE_LINUX_DEFAULT="console=tty0"
```
Then, run the following command to update GRUB:
```bash
grub2-mkconfig -o /boot/grub2/grub.cfg
grub2-install --target=i386-x86_64 --relocation-x86_64 --removable /dev/sda
```
Replace `/dev/sda` with the actual device containing your root partition.
5. **Use a BIOS firmware update tool**: Tools like `efibootmgr` or `grubutil` can help you update the BIOS firmware and configure the GRUB settings. For example:
```bash
efibootmgr -c -d /dev/sda -p 1 -n "CentOS 9" -l "x02x00x00x00x00x00x00x00" -w /boot/grub2/grub.cfg
```
This command updates the GRUB settings and loads the `grub.cfg` file. Replace `/dev/sda` with the actual device containing your root partition.
6. **Check for BIOS-specific settings**: Some BIOSes have specific settings that can cause this issue. Check your BIOS documentation to see if there are any settings that need to be adjusted.
7. **Try a different kernel**: If you're using a custom kernel, try loading a different kernel or a kernel from a different distribution to see if the issue persists.
8. **Reinstall GRUB**: If all else fails, you can try reinstalling GRUB:
```bash
grub2-install --target=i386-x86_64 --relocation-x86_64 --removable /dev/sda
grub2-mkconfig -o /boot/grub2/grub.cfg
```
Replace `/dev/sda` with the actual device containing your root partition.
If none of these steps resolve the issue, you may want to consider seeking further assistance from a Linux expert or the CentOS community.
Author: test test replied at 2026-08-28 12:44:32
tesing
