Grub2 kernel order preference (rt/generic)

[daltore]

I got a new laptop a couple of days ago, and although I've been running Karmic for a while on my old laptop, this is the first fresh install I've used. Tonight, I found out that Grub2 has completely replace the old version, and does not work the same way.

Since I've installed the UbuntuStudio updates and the realtime kernel, I wanted to go through and set the kernels flagged with "-rt" to be higher in preference to those flagged with "-generic" when it decides a default. I've also go Windows 7 on a different partition, but I want to boot Linux most of the time.

Right now, the kernels labelled "-generic" are taking preference. How do I tell Grub2 that "-rt" is more important without rewriting /etc/default/grub every time I install a new kernel?

[falconindy]

Grub is a dumb animal and will only do what it's told. There's no way to "weight" entries. A little manual maintenance every few weeks isn't so bad, eh?

[daltore]

Interesting. Alright, thanks for the help.

[funkyhat]

I've worked out a solution to this problem - see my blog post:

http://funkyhat.org/2010/01/19/putti...irst-in-grub2/

The gist of it is this:

cd /etc/grub.d
sudo cp 10_linux 09_linux-rt
sudo sed -i 's:\(vmlinu[^ ]*\)-\*:\1-*rt:g' 09_linux-rt #<-edits 09_linux-rt and makes
sudo update-grub                                          #  it only find -rt kernels

Hope this helps!

[canakas]

Nice work. Thank you!

Your sed command is not working, but manual editing of 09_linux-rt did the same job.
update-grub now finds the rt kernels first.

lets hope the reboot goes smoothly =)

EDIT: Looks good =)

[Peter7K]

Just found this, very useful, thanks guys!

Edit: Had a few questions but sorted them out.