Hello,
On Fedora Workstation 42 I encounter this issue that brightness slider is missing but after I use physical keyboard keys to lower/higher brightness level then brightness slider will show up!!
I also made a new user and checked with it but issue not related to user settings or even gnome extensions.
Before pressing physical keys:
After pressing physical keys:
I just checked, and I have the same issue with Intel graphics. I don’t remember what the behavior was in 41, so I can’t say if it was the same or not.
Since I always use the keyboard to adjust brightness, I didn’t notice this until you brought it up.
Working out of the box with KDE 
@litemotiv mentioned that issue has been fixed and will be back to Fedora but takes some time:
On my Dell laptop, the brightness control was missing from the top bar in Fedora 42. I was able to fix it by updating the system firmware with the following commands:
sudo dnf install fwupd
fwupdmgr update
fwupdmgr get-updates
fwupdmgr refresh --force
fwupdmgr update
After rebooting, the brightness control reappeared and is now working fine.
I just installed Fedora 42 on my Asus ProArt P16 H7606WI. When installed everything was fine, but after the system updates, i have EXACTLY the same issue.
I have also a problem with my system freezing from time to time.
The issue has been fixed kindly update the os completely and it will be fixed.
it is not solved, I can’t set it from the keyboard either
https://gitlab.gnome.org/GNOME/gnome-settings-daemon/-/issues/873
gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.gnome.SettingsDaemon.Power.Screen.StepUp
Error: GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._gsd_5fpower_5fmanager_5ferror.Code1: No usable backlight could be found!
the issue is that in:
ls -al /sys/class/backlight/
total 0
and checked in fedora42 live and here is a link and brightness works(bar and keyboard)
inxi -G
Device-1: Intel Raptor Lake-P [Iris Xe Graphics] driver: N/A
sudo modprobe -v i915
insmod /lib/modules/6.14.4-300.fc42.x86_64/kernel/drivers/gpu/drm/i915/i915.ko.xz
modprobe: ERROR: could not insert ‘i915’: No such device
the i915 module cannot be loaded,in fedora live is loaded
SecureBoot enabled:
sudo modprobe -v -f i915
insmod /lib/modules/6.14.4-300.fc42.x86_64/kernel/drivers/gpu/drm/i915/i915.ko.xz
modprobe: ERROR: could not insert ‘i915’: Key was rejected by service
With SecureBoot disabled have exec format error
Tried with all kernels from grub,reinstalled kernels
With Fedora Live have no issues with i915
I think in your case you have to report to bugzilla under kernel.
To fix this error
Weird is that the second kernel version 6.14.0 is the same version in the latest update and the fedora live…
Not work,what i have is a kernel bug,now I waiting for the next kernel version (6.14.5) and when the issue persist then I will report to bugzilla .
I decided to reinstall (repair) fedora and now all is ok.
Tell me if you update the system, if the issue returns. Here everything I make a clean install, works fine, but after a simple system update, the bug returns.
So far I don’t have the brightness working anymore.
Yes,I update the system and the issue not return..
