[BUG] High CPU usage in certain circumstances

[yochananmarqos]

Clight version the issue has been seen with:

4.0

Used distribution:

Manjaro GNOME

Describe the bug
A few things:

• At the top of the log, it says:

(W)[10:32:14]{opts.c:194}	SCREEN forcefully disabled as Clightd was built without screen support.

Is there a missing Cmake flag in the PKGBUILD?

• When I start my laptop (Dell Inspiron 5575) on battery power, the clight process uses a lot of CPU and no log is generated. If I kill clight, restart the clightd.service and start clight again, everything is fine.

• When keyboard backlight calibration is on, the backlight does not come on at all in the dark. It kind of defeats the purpose of having a keyboard backlight.

• When dpms is enabled, the screen turns of while watching a full-screen video. I use SMPlayer.

Expected behavior
Self-explanatory.

To Reproduce
Normal use.

clight.log

[FedeDP]

Hi! Thanks for reporting these issues!

At the top of the log, it says:

Fixed in Clightd 4.0-2 (https://aur.archlinux.org/packages/clightd/). Thanks!

When dpms is enabled, the screen turns of while watching a full-screen video. I use SMPlayer.

SMplayer uses mpv as backend. Unfortunately org.freedesktop.ScreenSaver support is broken in mpv at the moment. I have the same issue. I just right click on clight desktop file and select "Pause backlight calibration"; or you can use eg: vlc!
Hopefully it will be fixed soon.

When keyboard backlight calibration is on, the backlight does not come on at all in the dark. It kind of defeats the purpose of having a keyboard backlight.

This is weird! Can you report here output of: busctl call org.freedesktop.UPower /org/freedesktop/UPower/KbdBacklight org.freedesktop.UPower.KbdBacklight GetMaxBrightness ? Thanks!

When I start my laptop (Dell Inspiron 5575) on battery power, the clight process uses a lot of CPU and no log is generated. If I kill clight, restart the clightd.service and start clight again, everything is fine.

This is weird; i cannot reproduce it here. Your log seems fine.
Can you paste here a log from a clight fault run?

[yochananmarqos]

Fixed in Clightd 4.0-2 (https://aur.archlinux.org/packages/clightd/).

Aha! I thought there was a Cmake flag missing. 😄️ Thanks!

output of: busctl call org.freedesktop.UPower /org/freedesktop/UPower/KbdBacklight org.freedesktop.UPower.KbdBacklight GetMaxBrightness

i 2

I re-enabled keyboard backlight calibration and I'll see if I can catch something abnormal in the log.

[FedeDP]

Note how kbd backlight is set to (1.0 - backlight_level) * max_kbd_backlight (in your case 2): https://github.com/FedeDP/Clight/blob/master/src/modules/backlight.c#L268.
Moreover, it is rounded to nearest integer, thus it should be set to "2" on low ambient brightness, ie: your maximum!

Let me know about the other issue too! Thanks!

[NICHOLAS85]

I’ve also experienced the issue with the clight process using a lot of cpu a couple times. I haven’t been able to pinpoint when this occurs or what causes it, I usually only notice once I feel my laptop warming up abnormally. Killing and starting the clight process fixes this. I’ll leave on the verbose setting and attempt to share the log the next time this occurs.

[FedeDP]

Great, thanks for joining! I have been using clight devel for months and it didn't occur here, or I didn't notice...

EDIT: care to share your configs @yochananmarqos @NICHOLAS85 ?

[NICHOLAS85]

Here’s a link to my current config file:
https://raw.githubusercontent.com/NICHOLAS85/dotfiles/4c9a2719a60ce691f4350fea735c10743830382e/.config/clight.conf

[yochananmarqos]

Here's my clight.conf.

[yochananmarqos]

I noticed a webcam error in my journal after rebooting:

Nov 26 20:44:36 inspirognome kernel: uvcvideo: Failed to query (SET_CUR) UVC control 10 on unit 2: -32 (exp. 2).
Nov 26 20:44:36 inspirognome kernel: uvcvideo: Failed to query (SET_CUR) UVC control 4 on unit 1: -32 (exp. 4).

Only one error in the clight.log:

(D)[20:44:36]{bus.c:279}	get_screen_brightness(): Input/output error

[FedeDP]

Here’s a link to my current config file:

Here's my clight.conf.

You both have dimmer dpms and gamma disabled. I will try with this config if i can reproduce the issue!

I noticed a webcam error in my journal after rebooting:

That should not be an issue.

Only one error in the clight.log:

This is interesting. It seems that XGetImage() fails here: https://github.com/FedeDP/Clightd/blob/master/src/modules/screen.c#L95.

[yochananmarqos]

I can't reproduce the issue with the keyboard backlight now. Maybe it was a fluke or kernel 5.4 fixed it. It fixed not being able to resume from suspend, so you never know. ¯\_(ツ)_/¯

[FedeDP]

Let's focus on high cpu bug then!

[NICHOLAS85]

clight.log
The high cpu bug has occurred again, attached is a log. Some info is I recently rebooted. Additionally, I built clightd with SCREEN support but this log states it was built without at the top. After restarting clight that message at the top dissapears.

[FedeDP]

Mmmh I can't see anything wrong there. Is clightd.service enabled?