How can I rebuild my kernel back to 2.6.15

[lurch]

Hi
I have a sound problem with KDE which appears to be caused by kernel 2.6.16 according to post's i have read.
Can someone tell me how to revert back to 2.6.15 so I can try this ?
Thanks

[cvill64]

Hey Lurch,

There are two things you can try, you can either a) first try the upgrade (I would do this) and b) try the downgrade. To do a, simply do this:

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$ emerge gentoo-sources
$ zcat /proc/config.gz > /usr/src/config
$ genkernel --kernel-config=/usr/src/config --menuconfig --bootloader=grub --gensplash=default all


A make config menu will pop up and you can customize it a bit more, such as I would suggest changing the Processor to Amd64 versus just generic if you have amd or to Intel64 and the same if you have something like a Pentium M or 4 for 32, optimization at its best . Most of the other settings should be right, but if you know the setting in the kernel that is screwing with you KDE, you can try and correct that here. Then you exit, select yes to save the changes, and then reboot when its done and choose the new kernel.

Now to downgrade, you simply do the the same thing except

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$ emerge =sys-kernel/gentoo-sources-2.6.15-r7
$ zcat /proc/config.gz > /usr/src/config
$ genkernel --kernel-config=/usr/src/config --menuconfig --bootloader=grub --gensplash=default all


There is an r8 of 2.6.15, but it is unstable, where as r7 is stable for 64 and 32. Or you can follow B and try a different 2.6.16 kernel instead of going all the way back to .15. Best of luck

[cvill64]

Oh yes! If you use reiser4, you'll need to instead of doing

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$ emerge gentoo-sources

You need to do

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$ emerge reiser4-gentoo-sources

If you get an error saying there are no sources installed in /usr/src then append the "-u" option to your emerge.

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$ emerge -u gentoo-sources

or

$ emerge -u reiser4-gentoo-sources

If you're running miniedition, you can just do

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./scripts/emerge-kernel.sh

and it'll upgrade for you. And don't forget, if you have external drivers just

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$ emerge module-rebuild

and one more thing, if you have nvidia or ati, don't forget to emerge those again,

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$ emerge nvidia-kernel nvidia-glx

and the module-rebuild will automatically do it for your ati drivers If you're not using proprietary drivers, then you should have to worry, just to dhte module-rebuild emerge and it'll take care of it.