I just updated my system with the new lts kernel and my power consuptions went from between 5w-6w to 12w-14w after the upgrade. Does anyone know why the new kernel is drawing so much power?
old kernel version= lts 4.19.101-1
new kernal version= lts 5.4.19-1
Because it’s so powerful !!
All kidding aside, I’m using the same LTS kernel as well. I’ll let you know what I find out on my end. What’s your computer’s specs/components for reference? I’m on a thinkpad e560, the i7 version with AMD discrete graphics.
Edit: I mostly use it as a desktop with external components (monitor, keyboard, etc.) so I don’t really notice power consumption. I only take the thing on the go when I head to the courthouse for work.
I have listed my specs bellow. I have downgraded to the 4.19-lts kernel and power consumption went back to normal so im pretty sure is is the new 5.4-lts kernel.
OS: ArchLabs Linux x86_64
Host: Aspire E5-575G V1.47
Uptime: 11 hours, 17 mins
Packages: 943 (pacman) \
Shell: bash 5.0.11
I cons: ArchLabs [GTK2/3]
CPU: Intel i5-6200U (4) @ 2.800G
GPU: NVIDIA GeForce 940MX
GPU: Intel Skylake GT2 [HD Graph
Memory: 1635MiB / 15908MiB
How are you measuring the power consumption? Try
powertop to analyse usage.
Regressions are rife in Linux so I wouldn’t rule that out here, I suppose you could try the vanilla kernel to see if they’ve corrected any problems.
Using the old LTS version is not recommended, it contains known vulnerabilities that every script kiddie in China will be trying to exploit.
Thx for the warning
@anon42040838. Haven t tought about it.
I have been using powertop.
Thanks for the suggestion and warning, Head_on_a_Stick . I will try the most recent vanilla kernel and see if that make a difference.
Can you verify the increased consumption through any other methods? For example, is your battery getting used up quicker?
It could be that the new kernel reports power consumption differently but there is actually no substantial change at all.
yes. My battery does get used up quicker and my laptop gets really hot. Here is a link to my reply to a different thread. See what you think.
I thought that the random poweroff had been fixed since journalctl reported no errors and I hadn’t had any poweroffs for a few hours; however, that wasnt the case. I had another one(poweroff) and I am pretty sure that It was due to over heating. I found this thread, link is below, stating that recent kernels have had issues with increased power consumption. I know the thread suggests that lts-kernels newer than 4.19.83 have this issue but I have found that the latest 4.19.101 has brought my power consumption back to normal using powertop with the autotune setting. I have tried newer lts-kernals and even with powertop set to autotune power consumption doesn’t lower.
I haven’t tried the Vanilla-Kernels other than the most recent and power consumption is still high even with powertop set to autotune.
So, for now I guess I will have to stick with 4.19.101-lts until i hear of a fix.
If you hear of any fix with the new kernels please let me know since it was pointed out in a bug report thread that was issued that is is dangerous to use older lts-kernels do to security issues.