https://bugs.kde.org/show_bug.cgi?id=420861
Bug ID: 420861
Summary: Powerdevil can’t adjust brightness: wrong sysfs entry
Product: Powerdevil
Version: 5.18.4
Platform: Ubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: to.roma.from.kde...@qwertty.com
Target Milestone: ---
On my Dell XPS 9570 Powerdevil is unable to adjust screen brightness. This is
because the laptop has two sysfs entries:
$ grep -s . /sys/class/backlight/*/*
/sys/class/backlight/acpi_video0/actual_brightness:2
/sys/class/backlight/acpi_video0/bl_power:0
/sys/class/backlight/acpi_video0/brightness:2
/sys/class/backlight/acpi_video0/max_brightness:10
/sys/class/backlight/acpi_video0/scale:unknown
/sys/class/backlight/acpi_video0/type:firmware
/sys/class/backlight/intel_backlight/actual_brightness:12000
/sys/class/backlight/intel_backlight/bl_power:0
/sys/class/backlight/intel_backlight/brightness:12000
/sys/class/backlight/intel_backlight/max_brightness:120000
/sys/class/backlight/intel_backlight/scale:unknown
/sys/class/backlight/intel_backlight/type:raw
Writing to acpi_video0/brightness does nothing. Writing to
intel_backlight/brightness works.
However, the code in daemon/backends/upower/backlighthelper.cpp looks at the
“type” parameter and prefers “firmware” to “platform” to “raw”, which, in this
case, chooses the wrong device. The error is fixed, at least on my laptop, if I
edit the code to make “raw” entries the top preference.
Please add more logic to choose the correct sysfs entry or make it user
configurable.
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