[solved] LTS: screen no longer goes into power save

Bronze · 2018-04-28 22:09:20

I have an old Dell laptop running arch. In december I ran the 4.14.4-1-ck-nehalem kernel (no X). The laptop's screen used to go black after not using it for a few minutes. However, when 4.14 came, it no longer turned black.

I fixed it by running the LTS kernel at the time.
Now LTS has also caught up and is 4.14 and my screen fails to go into powersave

What may have happened to the power saving settings? How to fix?

lspci -k | grep -EA3 'VGA|3D|Display'
lspci: Unable to load libkmod resources: error -12
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 18)
Subsystem: Dell Core Processor Integrated Graphics Controller
Kernel driver in use: i915
00:16.0 Communication controller: Intel Corporation 5 Series/3400 Series Chipset HECI Controller (rev 06)

Last edited by Bronze (2018-05-02 00:12:38)

Bronze · 2018-04-30 22:47:13

I tried some kernels between 4.9 and 4.14 and found that 4.12 introduced the issue.
I have not reported a bug before. How to go about this?

seth · 2018-05-01 05:58:22

Did you read https://wiki.archlinux.org/index.php/Di … th_setterm and try the setterm commands to control dpms explicitly?

Bronze · 2018-05-01 23:30:54

Indeed, as of 4.12 "cat /sys/module/kernel/parameters/consoleblank" returns 0
setterm - blank X fixed it.

Can I set that parameter to a different value at boot time, withoug having to use setterm?

Bronze · 2018-05-02 00:12:11

I added "consoleblank=120" as kernel parameter to blank the screen in 120sec.

Arch Linux

#1 2018-04-28 22:09:20

[solved] LTS: screen no longer goes into power save

#2 2018-04-30 22:47:13

Re: [solved] LTS: screen no longer goes into power save

#3 2018-05-01 05:58:22

Re: [solved] LTS: screen no longer goes into power save

#4 2018-05-01 23:30:54

Re: [solved] LTS: screen no longer goes into power save

#5 2018-05-02 00:12:11

Re: [solved] LTS: screen no longer goes into power save

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