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Old 03-07-2017, 08:16 AM   #1
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how to update grub?


I have the following error in my dmesg output:

tsc: Fast TSC calibration failed
I don't really understand what it means, but searching around I get that I should add acpi_pm to GRUB_CMDLINE_LINUX in /etc/default/grub:

I got the instructions from here.

After that I'm supposed to update GRUB, but how do I do that on Slackware 14.2?
Old 03-07-2017, 11:23 AM   #2
Registered: Sep 2004
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If you already have grub / os-prober installed, and an existing grub.cfg was already made at some point in the past;
grub-mkconfig -o /boot/grub/grub.cfg
This is assuming your grub.cfg is in /boot/grub/, and your kernel (/boot/vmlinuz*) and any initrd (/boot/initrd.gz, etc) files are already in place and will match the filenames that the scripts (/etc/grub.d/10_linux, and so on) look for to determine what menu entries to create.
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Old 03-08-2017, 02:37 AM   #3
Registered: Dec 2012
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On Slackware, if you update grub.cfg manually, you don't need to update grub as it will automatically read /boot/grub/grub.cfg at boot and take everything that is in there.

However, if (e.g. you update your kernel and) subsequently run grub-mkconfig, then you will have a new grub.cfg generated without the modifications you made. So, back it up before running any grub-mkconfig.

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Old 03-16-2017, 06:05 AM   #4
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Thanks a lot for clearing that up!


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