Have to restart powerdevil to get brightness settings back

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1

powerdevil 6.3.0-1
plasmashell 6.3.0
Arch Linux

Also when its restarted it automatically goes to 100% and not back to where it should be at 52%

journalctl --user --unit plasma-powerdevil -b

Feb 12 14:42:22 mustafar systemd[830]: Starting Powerdevil...
Feb 12 14:42:22 mustafar org_kde_powerdevil[1195]: Initializing libddcutil.  ddcutil version: 2.1.4, shared library: /usr/lib/libddcutil.so.5.1.2
Feb 12 14:42:22 mustafar org_kde_powerdevil[1195]: Options passed from client:
Feb 12 14:42:22 mustafar org_kde_powerdevil[1195]: Applying combined options:
Feb 12 14:42:22 mustafar org_kde_powerdevil[1195]: busno=2, Feature 0xdd should not exist but ddc_get_nontable_vcp_value() succeeds, returning mh=0x00 ml=0x64 sh=0x00 sl=0x64
Feb 12 14:42:22 mustafar org_kde_powerdevil[1195]: busno=2, Feature 0x41 should not exist but ddc_get_nontable_vcp_value() succeeds, returning mh=0x00 ml=0x64 sh=0x00 sl=0x64
Feb 12 14:42:22 mustafar org_kde_powerdevil[1195]: busno=2, Feature 0x00 should not exist but ddc_get_nontable_vcp_value() succeeds, returning mh=0x00 ml=0x64 sh=0x00 sl=0x64
Feb 12 14:42:22 mustafar org_kde_powerdevil[1195]: busno=2, All features that should not exist detected. Monitor does not indicate unsupported
Feb 12 14:42:22 mustafar org_kde_powerdevil[1195]: Library initialization complete.
Feb 12 14:42:22 mustafar org_kde_powerdevil[1195]: org.kde.powerdevil: [DDCutilDetector]: Failed to initialize callback
Feb 12 14:42:22 mustafar org_kde_powerdevil[1195]: org.kde.powerdevil: org.kde.powerdevil.chargethresholdhelper.getthreshold failed "Charge thresholds are not supported by the kernel for this hardware"
Feb 12 14:42:22 mustafar org_kde_powerdevil[1195]: org.kde.powerdevil: org.kde.powerdevil.backlighthelper.brightness failed
Feb 12 14:42:22 mustafar systemd[830]: Started Powerdevil.
Feb 12 14:42:22 mustafar org_kde_powerdevil[1195]: org.kde.powerdevil: Handle button events action could not check for screen configuration
Feb 12 14:42:22 mustafar org_kde_powerdevil[1195]: org.kde.powerdevil: org.kde.powerdevil.chargethresholdhelper.getthreshold failed "Charge thresholds are not supported by the kernel for this hardware"
Feb 12 14:42:44 mustafar org_kde_powerdevil[1195]: dh=Display_Handle[i2c-2: fd=32], Replacing adjusted sleep multiplier 0.05 with 1.00 for SE_POST_WRITE or SE_POST_SAVE_SETTINGS
Feb 12 16:20:50 mustafar org_kde_powerdevil[1195]: dh=Display_Handle[i2c-2: fd=32], Replacing adjusted sleep multiplier 0.05 with 1.00 for SE_POST_WRITE or SE_POST_SAVE_SETTINGS
Feb 12 16:21:53 mustafar org_kde_powerdevil[1195]: qt.qpa.wayland: There are no outputs - creating placeholder screen
Feb 12 16:21:55 mustafar org_kde_powerdevil[1195]: org.kde.powerdevil: [DDCutilDisplay]: ddca_open_display2 -3030
Feb 12 16:21:55 mustafar org_kde_powerdevil[1195]: org.kde.powerdevil: [DDCutilDisplay]: "DELL U2421E" retrying to set DDC/CI brightness in 1000 milliseconds - attempt no. 1
Feb 12 16:21:56 mustafar org_kde_powerdevil[1195]: org.kde.powerdevil: [DDCutilDisplay]: ddca_open_display2 -3030
Feb 12 16:21:56 mustafar org_kde_powerdevil[1195]: org.kde.powerdevil: [DDCutilDisplay]: "DELL U2421E" retrying to set DDC/CI brightness in 2000 milliseconds - attempt no. 2
Feb 12 16:21:58 mustafar org_kde_powerdevil[1195]: org.kde.powerdevil: [DDCutilDisplay]: ddca_open_display2 -3030
Feb 12 16:21:58 mustafar org_kde_powerdevil[1195]: org.kde.powerdevil: [DDCutilDisplay]: "DELL U2421E" retrying to set DDC/CI brightness in 3000 milliseconds - attempt no. 3
Feb 12 16:22:01 mustafar org_kde_powerdevil[1195]: org.kde.powerdevil: [DDCutilDisplay]: ddca_open_display2 -3030
Feb 12 16:22:01 mustafar org_kde_powerdevil[1195]: org.kde.powerdevil: [DDCutilDisplay]: "DELL U2421E" failed to set DDC/CI brightness
Feb 14 10:16:49 mustafar systemd[830]: Stopping Powerdevil...
Feb 14 10:16:49 mustafar systemd[830]: Stopped Powerdevil.
Feb 14 10:16:49 mustafar systemd[830]: Starting Powerdevil...
Feb 14 10:16:50 mustafar org_kde_powerdevil[31200]: Initializing libddcutil.  ddcutil version: 2.1.4, shared library: /usr/lib/libddcutil.so.5.1.2
Feb 14 10:16:50 mustafar org_kde_powerdevil[31200]: Options passed from client:
Feb 14 10:16:50 mustafar org_kde_powerdevil[31200]: Applying combined options:
Feb 14 10:16:50 mustafar org_kde_powerdevil[31200]: busno=2, Feature 0xdd should not exist but ddc_get_nontable_vcp_value() succeeds, returning mh=0x00 ml=0x64 sh=0x00 sl=0x64
Feb 14 10:16:50 mustafar org_kde_powerdevil[31200]: busno=2, Feature 0x41 should not exist but ddc_get_nontable_vcp_value() succeeds, returning mh=0x00 ml=0x64 sh=0x00 sl=0x64
Feb 14 10:16:50 mustafar org_kde_powerdevil[31200]: busno=2, Feature 0x00 should not exist but ddc_get_nontable_vcp_value() succeeds, returning mh=0x00 ml=0x64 sh=0x00 sl=0x64
Feb 14 10:16:50 mustafar org_kde_powerdevil[31200]: busno=2, All features that should not exist detected. Monitor does not indicate unsupported
Feb 14 10:16:50 mustafar org_kde_powerdevil[31200]: Library initialization complete.
Feb 14 10:16:50 mustafar org_kde_powerdevil[31200]: org.kde.powerdevil: [DDCutilDetector]: Failed to initialize callback
Feb 14 10:16:50 mustafar org_kde_powerdevil[31200]: org.kde.powerdevil: org.kde.powerdevil.chargethresholdhelper.getthreshold failed "Charge thresholds are not supported by the kernel for this hardware"
Feb 14 10:16:50 mustafar org_kde_powerdevil[31200]: org.kde.powerdevil: org.kde.powerdevil.backlighthelper.brightness failed
Feb 14 10:16:50 mustafar systemd[830]: Started Powerdevil.
Feb 14 10:16:50 mustafar org_kde_powerdevil[31200]: org.kde.powerdevil: Handle button events action could not check for screen configuration
Feb 14 10:16:50 mustafar org_kde_powerdevil[31200]: org.kde.powerdevil: org.kde.powerdevil.chargethresholdhelper.getthreshold failed "Charge thresholds are not supported by the kernel for this hardware"
Feb 14 10:16:51 mustafar org_kde_powerdevil[31200]: dh=Display_Handle[i2c-2: fd=32], Replacing adjusted sleep multiplier 0.30 with 1.00 for SE_POST_WRITE or SE_POST_SAVE_SETTINGS
Feb 14 10:17:03 mustafar org_kde_powerdevil[31200]: dh=Display_Handle[i2c-2: fd=32], Replacing adjusted sleep multiplier 0.30 with 1.00 for SE_POST_WRITE or SE_POST_SAVE_SETTINGS
Feb 14 10:17:06 mustafar org_kde_powerdevil[31200]: dh=Display_Handle[i2c-2: fd=32], Replacing adjusted sleep multiplier 0.30 with 1.00 for SE_POST_WRITE or SE_POST_SAVE_SETTINGS
Feb 14 11:41:37 mustafar org_kde_powerdevil[31200]: dh=Display_Handle[i2c-2: fd=32], Replacing adjusted sleep multiplier 0.30 with 1.00 for SE_POST_WRITE or SE_POST_SAVE_SETTINGS
Feb 14 11:41:41 mustafar org_kde_powerdevil[31200]: dh=Display_Handle[i2c-2: fd=32], Replacing adjusted sleep multiplier 0.30 with 1.00 for SE_POST_WRITE or SE_POST_SAVE_SETTINGS
Feb 14 12:09:13 mustafar org_kde_powerdevil[31200]: dh=Display_Handle[i2c-2: fd=32], Replacing adjusted sleep multiplier 0.30 with 1.00 for SE_POST_WRITE or SE_POST_SAVE_SETTINGS
Feb 14 12:10:19 mustafar org_kde_powerdevil[31200]: qt.qpa.wayland: There are no outputs - creating placeholder screen
Feb 14 12:10:21 mustafar org_kde_powerdevil[31200]: org.kde.powerdevil: [DDCutilDisplay]: ddca_open_display2 -3030
Feb 14 12:10:21 mustafar org_kde_powerdevil[31200]: org.kde.powerdevil: [DDCutilDisplay]: "DELL U2421E" retrying to set DDC/CI brightness in 1000 milliseconds - attempt no. 1
Feb 14 12:10:22 mustafar org_kde_powerdevil[31200]: org.kde.powerdevil: [DDCutilDisplay]: ddca_open_display2 -3030
Feb 14 12:10:22 mustafar org_kde_powerdevil[31200]: org.kde.powerdevil: [DDCutilDisplay]: "DELL U2421E" retrying to set DDC/CI brightness in 2000 milliseconds - attempt no. 2
Feb 14 12:10:24 mustafar org_kde_powerdevil[31200]: org.kde.powerdevil: [DDCutilDisplay]: ddca_open_display2 -3030
Feb 14 12:10:24 mustafar org_kde_powerdevil[31200]: org.kde.powerdevil: [DDCutilDisplay]: "DELL U2421E" retrying to set DDC/CI brightness in 3000 milliseconds - attempt no. 3
Feb 14 12:10:27 mustafar org_kde_powerdevil[31200]: org.kde.powerdevil: [DDCutilDisplay]: ddca_open_display2 -3030
Feb 14 12:10:27 mustafar org_kde_powerdevil[31200]: org.kde.powerdevil: [DDCutilDisplay]: "DELL U2421E" failed to set DDC/CI brightness
Feb 14 12:28:35 mustafar systemd[830]: Stopping Powerdevil...
Feb 14 12:28:35 mustafar systemd[830]: Stopped Powerdevil.
Feb 14 12:28:35 mustafar systemd[830]: Starting Powerdevil...
Feb 14 12:28:35 mustafar org_kde_powerdevil[68460]: Initializing libddcutil.  ddcutil version: 2.1.4, shared library: /usr/lib/libddcutil.so.5.1.2
Feb 14 12:28:35 mustafar org_kde_powerdevil[68460]: Options passed from client:
Feb 14 12:28:35 mustafar org_kde_powerdevil[68460]: Applying combined options:
Feb 14 12:28:36 mustafar org_kde_powerdevil[68460]: busno=2, Feature 0xdd should not exist but ddc_get_nontable_vcp_value() succeeds, returning mh=0x00 ml=0x64 sh=0x00 sl=0x64
Feb 14 12:28:36 mustafar org_kde_powerdevil[68460]: busno=2, Feature 0x41 should not exist but ddc_get_nontable_vcp_value() succeeds, returning mh=0x00 ml=0x64 sh=0x00 sl=0x64
Feb 14 12:28:36 mustafar org_kde_powerdevil[68460]: busno=2, Feature 0x00 should not exist but ddc_get_nontable_vcp_value() succeeds, returning mh=0x00 ml=0x64 sh=0x00 sl=0x64
Feb 14 12:28:36 mustafar org_kde_powerdevil[68460]: busno=2, All features that should not exist detected. Monitor does not indicate unsupported
Feb 14 12:28:36 mustafar org_kde_powerdevil[68460]: Library initialization complete.
Feb 14 12:28:36 mustafar org_kde_powerdevil[68460]: org.kde.powerdevil: [DDCutilDetector]: Failed to initialize callback
Feb 14 12:28:36 mustafar org_kde_powerdevil[68460]: org.kde.powerdevil: org.kde.powerdevil.chargethresholdhelper.getthreshold failed "Charge thresholds are not supported by the kernel for this hardware"
Feb 14 12:28:36 mustafar org_kde_powerdevil[68460]: org.kde.powerdevil: org.kde.powerdevil.backlighthelper.brightness failed
Feb 14 12:28:36 mustafar systemd[830]: Started Powerdevil.
Feb 14 12:28:36 mustafar org_kde_powerdevil[68460]: org.kde.powerdevil: Handle button events action could not check for screen configuration
Feb 14 12:28:36 mustafar org_kde_powerdevil[68460]: org.kde.powerdevil: org.kde.powerdevil.chargethresholdhelper.getthreshold failed "Charge thresholds are not supported by the kernel for this hardware"
Feb 14 12:28:37 mustafar org_kde_powerdevil[68460]: dh=Display_Handle[i2c-2: fd=32], Replacing adjusted sleep multiplier 0.05 with 1.00 for SE_POST_WRITE or SE_POST_SAVE_SETTINGS
Feb 14 12:28:55 mustafar org_kde_powerdevil[68460]: dh=Display_Handle[i2c-2: fd=32], Replacing adjusted sleep multiplier 0.05 with 1.00 for SE_POST_WRITE or SE_POST_SAVE_SETTINGS
Feb 14 12:28:57 mustafar org_kde_powerdevil[68460]: dh=Display_Handle[i2c-2: fd=32], Replacing adjusted sleep multiplier 0.05 with 1.00 for SE_POST_WRITE or SE_POST_SAVE_SETTINGS
Feb 14 12:33:03 mustafar org_kde_powerdevil[68460]: qt.qpa.wayland: There are no outputs - creating placeholder screen
Feb 14 12:33:05 mustafar org_kde_powerdevil[68460]: dh=Display_Handle[i2c-2: fd=32], Keeping adjusted sleep multiplier 1.60 for SE_POST_WRITE or SE_POST_SAVE_SETTINGS
Feb 14 12:33:20 mustafar org_kde_powerdevil[68460]: dh=Display_Handle[i2c-2: fd=32], Keeping adjusted sleep multiplier 1.60 for SE_POST_WRITE or SE_POST_SAVE_SETTINGS
Feb 14 12:33:22 mustafar org_kde_powerdevil[68460]: dh=Display_Handle[i2c-2: fd=32], Keeping adjusted sleep multiplier 1.60 for SE_POST_WRITE or SE_POST_SAVE_SETTINGS
2

I have this issue too perhaps someone can answer this?

3

Hi - when you aren’t able to set the brightness via the graphical interface, does using ddcutil to change it using the command line work?

It sounds like you’re probably experiencing a combination of these two issues reported via the KDE Bugtracking System:

If you’d like, you can add yourself to the CC list in Bugzilla to get email notifications whenever new comments are added or the status is changed :slight_smile:

That CC list checkbox is located here - making sure that’s checked, then choosing “Save Changes” will add you:

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