During shutdown or reboot system will hang.
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SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server 11
SUSE Linux Enterprise Desktop 12
SUSE Linux Enterprise Desktop 11
The problem can occur with or without a Support Pack installed.
Here is a list of all the options:
The reboot= options are all listed in the following file (if you have the kernel source installed): /usr/src/linux/arch/x86/kernel/reboot.c warm = Don’t set the cold reboot flag cold = Set the cold reboot flag bios = Reboot by jumping through the BIOS (only for X86_32) smp = Reboot by executing reset on BSP or other CPU (only for X86_32) triple = Force a triple fault (init) kbd = Use the keyboard controller. cold reset (this is the default) acpi = Use the RESET_REG in the FADT efi = Use efi reset_system runtime service pci = Use the so-called “PCI reset register”, CF9 force = Avoid anything that could hang.
For SLES12 / SLES15
The reboot= options are all listed in the following file (if you have the kernel source installed): /usr/src/linux/Documentation/x86/x86_64/boot-options.txt: or: /usr/src/linux/Documentation/x86/x86_64/boot-options.rst: reboot=b[ios] | t[riple] | k[bd] | a[cpi] | e[fi] [, [w]arm | [c]old] bios Use the CPU reboot vector for warm reset warm Don't set the cold reboot flag cold Set the cold reboot flag triple Force a triple fault (init) kbd Use the keyboard controller. cold reset (default) acpi Use the ACPI RESET_REG in the FADT. If ACPI is not configured or the ACPI reset does not work, the reboot path attempts the reset using the keyboard controller. efi Use efi reset_system runtime service. If EFI is not configured or the EFI reset does not work, the reboot path attempts the reset using the keyboard controller. Using warm reset will be much faster especially on big memory systems because the BIOS will not go through the memory check. Disadvantage is that not all hardware will be completely reinitialized on reboot so there may be boot problems on some systems. reboot=force Don't stop other CPUs on reboot. This can make reboot more reliable in some cases.
Most of the time the problem can be fixed by using one of the following two parameters:
Try these first then move on to the others if needed.
Each time you boot up with a new parameter you can verify that it was really used in the kernel load line by entering this command:
This will return the options the kernel was loaded with and would look something like this:
root=/dev/disk/by-id/ata-WDC_WD3200BEKT-75KA9T0_WD-WXA1A80E1055-part5 resume=/dev/disk/by-id/ata-WDC_WD3200BEKT-75KA9T0_WD-WXA1A80E1055-part3 splash=silent vga=0x314 reboot=bios
Just look for the "reboot=" parameter and make sure it is appropriate.
Once the parameter is found that works for the system it can be added to the grub menu so it will be included on every boot. Here are the steps:
Load YaST and take the selection for System--> Boot Loader.
Highlight the default selection (the one with the check mark in the first column) and click the Edit button.
In the entry titled "Optional Kernel Command Line Parameter" add your new parameter to the end of the line. Click OK to save the new setting. Back on the Boot Loader Settings window click OK again and reboot the system to test it out.
In addition, you can see in this file that there are specific settings for this parameter applied for certain models of Dell, HP, and others to work around BIOS issues. Of course, the exceptions are not complete so manually changing this parameter will be required for some systems.
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- Document ID:7009779
- Creation Date: 21-Nov-2011
- Modified Date:10-May-2023
- SUSE Linux Enterprise Desktop
- SUSE Linux Enterprise Server
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