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Tellegar

Member

Registered: 2023-03-02

Posts: 2

my brightness is mapped wrongly

to explain, i change my brightness using

xbacklight =<value>

values 0-10 are mapped to the same as 11-100 and everything bigger than 100 is the same.
this doesn't seem as the correct behavior and i have no idea how to fix this

this might help

$ lsmod | grep video
video                  73728  2 asus_wmi,nvidia_modeset
wmi                    45056  3 video,asus_wmi,wmi_bmof

$ lspci -v | grep VGA -A12
0000:01:00.0 VGA compatible controller: NVIDIA Corporation GA103M [GeForce RTX 3080 Ti Mobile] (rev a1) (prog-if 00 [VGA controller])
	Subsystem: ASUSTeK Computer Inc. Device 1b4c
	Physical Slot: 1
	Flags: bus master, fast devsel, latency 0, IRQ 227, IOMMU group 13
	Memory at 76000000 (32-bit, non-prefetchable) [size=16M]
	Memory at 6000000000 (64-bit, prefetchable) [size=16G]
	Memory at 6400000000 (64-bit, prefetchable) [size=32M]
	I/O ports at 4000 [size=128]
	Expansion ROM at 77000000 [virtual] [disabled] [size=512K]
	Capabilities: <access denied>
	Kernel driver in use: nvidia
	Kernel modules: nouveau, nvidia_drm, nvidia

Tellegar

Member

Registered: 2023-03-02

Posts: 2

Re: my brightness is mapped wrongly

After recent update of linux kernel (might be some other package that was updated as well) the brightness default after restart remains the 10% but the real brightness was fixed.

So the question now is how can i set the default brightness of my main display on notebook?

Mortimer Houghton

Member

Registered: 2014-09-28

Posts: 89

Re: my brightness is mapped wrongly

What is in /sys/class/backlight folder?
What does cat /sys/class/backlight/<yourbacklight>/max_brightness indicate?
Can you change the brightness manually: echo <numberInRange> > /sys/class/backlight/<yourbacklight>/brightness