Thanks for the report, and don't worry about filing against gnome-
control-center — it's a natural first guess since brightness settings
live in the Settings app. That said, on Ubuntu the actual backlight
control is handled by the kernel (ACPI/WMI drivers like asus-wmi) which
expose interfaces under /sys/class/backlight/ or /sys/class/iio/, and
then by gnome-settings-daemon and mutter to make the controls work on
the desktop side. The Settings panel itself just reads what those layers
provide.
Because this is on a daily build with kernel 7.0-rc7, it's quite
possible the kernel hasn't yet created the right backlight interfaces
for your OLED panel. To figure out which layer is responsible, could you
run the following on the same system (or a later daily build if one is
available):
1. Check whether the kernel sees any backlight devices:
ls /sys/class/backlight/
2. If that directory is empty or shows nothing relevant, check for IIO-based
sensors instead:
ls /sys/class/iio/device/
3. Look for asus_wmi or ACPI video driver messages in dmesg:
dmesg | grep -i "asus_wmi\|acpi_video\|oled_backlight\|backlight"
4. Check the journal for any errors when you try to change brightness (press a
brightness key, wait a moment, then run):
journalctl --since "10 minutes ago" | grep -i
"brightness\|backlight\|asus_wmi\|g-s-d-power"
If step 1 shows a device (for example asw_backlight or oled_backlight),
the kernel sees it and the issue may be in gnome-settings-daemon or
mutter. If the directory is empty, the kernel driver likely hasn't
initialized support for your panel yet, which would be a kernel-side
fix.
Also, could you confirm whether the Fn+F5/F6 (or whatever) brightness
keys produce any on-screen indicator at all? Even if brightness doesn't
change, seeing the OSD would help narrow things down.
I've noted that bug #2085359 as a related report — different model but
same symptom class. If you can share the output of the commands above, I
can help determine whether this should be refiled against the linux
kernel package.
Thanks for your patience with this and your input helps push the support
forward.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2148630
Title:
Brightness control does not work at all on ROG Zephyrus G14 GA403WP
laptop
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