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Which Kernel?

Posted: Tue Sep 10, 2019 7:41 am
by fredmint
I installed mint XFCE 19.2 on my Lenovo X240 laptop.
I noticed that the installed kernel is currently 4.15.060.
Kernel 5.0.0.27 is available in the update manager.

Is there a reason I should switch to 5.0 kernel instead of 4.15 branch : better SSD management, faster CPU, Longer battery life... ???

Re: Which Kernel?

Posted: Tue Sep 10, 2019 7:49 am
by Hoser Rob
In Linux new kernels are really meant for new hardware support, and the machine you're talking about is 5 years old. So I wouldn't expect performance improvements, the opposite is at least as likely.

It can't hurt to try a newer kernel though, as long as you know how to reboot into the last one if it breaks something. Just reboot (hit ctl-alt-F11 to get a tty login if necessary. Then, as it's startiing, hold down the left shift key to bring up the grub menu. Scroll to the last working kernel and finish booting.. Then remove the newer kernel (I use SYnaptic).

Other high level updates aren't so easy to revert if something breaks, a system backup is advisable before trying those.

Re: Which Kernel?

Posted: Tue Sep 10, 2019 8:09 am
by fredmint
thank's for the warning.
My system is working fine with 4.15 kernel so I think I should not take the risk to break it with a newer kernel.

Re: Which Kernel?

Posted: Tue Sep 10, 2019 8:18 am
by gm10
fredmint wrote:
Tue Sep 10, 2019 7:41 am
Is there a reason I should switch to 5.0 kernel instead of 4.15 branch : better SSD management, faster CPU, Longer battery life... ???
Not sure what you mean with SSD management, but there were some notable improvements to the F2FS filesystem, should you be using that on you SSD (unlikely). Your CPU won't get faster, but power management has been improved for certain platforms, so longer battery life is a possibility.

Only one way to find out if it works well on your device. 5.2 will become available soon, too.

Re: Which Kernel?

Posted: Tue Sep 10, 2019 8:38 am
by Spearmint2
fredmint wrote:
Tue Sep 10, 2019 8:09 am
thank's for the warning.
My system is working fine with 4.15 kernel so I think I should not take the risk to break it with a newer kernel.

yes, the 11th Commandment. ;)

Re: Which Kernel?

Posted: Tue Sep 10, 2019 3:12 pm
by fredmint
finally switch to kernel 5.
All seems OK, battery life 6h18mn at 64% with firefox opened.
Can tell if it is better than Kernel 4.15, battery life was great too and is impressive with this laptop.

Re: Which Kernel?

Posted: Tue Sep 10, 2019 3:37 pm
by Pjotr
Why "upgrade" to a short-lived intermediate kernel series like the 5.0, when the older, long term supported kernel series (4.15.x) works just as well? :shock:

Re: Which Kernel?

Posted: Tue Sep 10, 2019 3:58 pm
by fredmint
Pjotr wrote:
Tue Sep 10, 2019 3:37 pm
Why "upgrade" to a short-lived intermediate kernel series like the 5.0, when the older, long term supported kernel series (4.15.x) works just as well? :shock:
because human nature is curious and there is a French saying : "if it works, touch it until it is broken" :lol:

Re: Which Kernel?

Posted: Tue Sep 10, 2019 3:59 pm
by fredmint
fredmint wrote:
Tue Sep 10, 2019 3:58 pm
Pjotr wrote:
Tue Sep 10, 2019 3:37 pm
Why "upgrade" to a short-lived intermediate kernel series like the 5.0, when the older, long term supported kernel series (4.15.x) works just as well? :shock:
because human nature is curious and there is a French saying : "if it works, hack it until it is broken" :lol:

Re: Which Kernel?

Posted: Tue Sep 10, 2019 4:04 pm
by Pjotr
fredmint wrote:
Tue Sep 10, 2019 3:58 pm
Pjotr wrote:
Tue Sep 10, 2019 3:37 pm
Why "upgrade" to a short-lived intermediate kernel series like the 5.0, when the older, long term supported kernel series (4.15.x) works just as well? :shock:
because human nature is curious and there is a French saying : "if it works, touch it until it is broken" :lol:
That's a good reason. :mrgreen: