Confirming a command for switching kernels

[Francisco Tissera]

Hello everyone,

Because of some wi-fi problems I'm having with the latest 5.12 rc4 
kernel in rawhide, I'd like to switch back to 5.12 rc3, because I recall 
that wi-fi worked.

The command, credits to Ed, I tried, was

sudo grub2-editenv - set 
"saved_entry=133a2487cda040dbbe9609f0ab827def-5.12.0-0.rc3.20210319git8b12a62a4e3e.172.fc35.x86_64

but it didn't work, so I'm wondering if that entry thing needs to be 
changed.

If so, how? what should I do?

Thanks for any answer.

Best regards.

Francisco.

[Ed Greshko]

On 27/03/2021 18:35, Francisco Tissera wrote:
> Because of some wi-fi problems I'm having with the latest 5.12 rc4 kernel in rawhide, I'd like to switch back to 5.12 rc3, because I recall that wi-fi worked.
>
> The command, credits to Ed, I tried, was
>
> sudo grub2-editenv - set "saved_entry=133a2487cda040dbbe9609f0ab827def-5.12.0-0.rc3.20210319git8b12a62a4e3e.172.fc35.x86_64
>
> but it didn't work, so I'm wondering if that entry thing needs to be changed.
>
> If so, how? what should I do?
>
> Thanks for any answer.

Well, I did something like that on an F33 system. Switching from 5.11.9-200.fc33 to 5.11.7-200.fc33
with no problem.

After doing the "set" command did you verify that it took by doing the "list" command?

I don't know if it is an email issue, but the command you showed didn't have a closing quote mark.

[Sam Varshavchik]

Francisco Tissera writes:
> Hello everyone,
>
> Because of some wi-fi problems I'm having with the latest 5.12 rc4 kernel in  
> rawhide, I'd like to switch back to 5.12 rc3, because I recall that wi-fi  
> worked.
>
> The command, credits to Ed, I tried, was
>
> sudo grub2-editenv - set  
> "saved_entry=133a2487cda040dbbe9609f0ab827def-5.12.0-0.rc3.20210319git8b12a62a4e3e. 
> 172.fc35.x86_64
>
> but it didn't work, so I'm wondering if that entry thing needs to be changed.
>
> If so, how? what should I do?

grubby --set-default=/boot/vmlinuz-??????.fc33.x86_64

Fill in the path to the kernel version you want to boot by default.

I did this for a few months while the noveau kernel driver has been utterly  
fubared, until it got fixed.

Althought it's unclear whether this would work now that your grub2 config  
has been fiddled with, first. But, that would've been what does the trick.