Xubuntu 18.04: make Fn brightness keys work with /sys/class/backlight/nv_backlight/
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I have an old laptop, oldtimer linux fellow, and updated it to xubuntu 18.04.
After some sleep/resume problems with the proprietary nvidia-340 driver, I decided to try the nouveau. Sleep/resume ok. But there is a new problem: the brightness.
Using the proprietary driver, with Option "RegistryDwords" "EnableBrightnessControl=1" in the xorg.conf, the Fn-bright-up and Fn-bright-down keys work out of the box.
With the nouveau driver they don't.
$ ls /sys/class/backlight/
returns acpi_video0 and nv_backlight.
As expected nothing can be done using acpi_video0.
But, surprise! The nv_backlight is working:
$ echo 20 | sudo tee /sys/class/backlight/nv_backlight/brightness
works!
But I don't know how to make my friend xfce knows that the Fn-bright-up and Fn-bright-down should talk with /sys/class/backlight/nv_backlight/brightness instead of /sys/class/backlight/acpi_video0/brightness.
Thank you.
nvidia xfce brightness backlight
edited Jun 14 at 23:19
WinEunuuchs2Unix
34.2k756130
asked May 28 at 1:03
dedalu
13816
add a comment |Â
up vote
1
down vote
favorite
I have an old laptop, oldtimer linux fellow, and updated it to xubuntu 18.04.
After some sleep/resume problems with the proprietary nvidia-340 driver, I decided to try the nouveau. Sleep/resume ok. But there is a new problem: the brightness.
Using the proprietary driver, with Option "RegistryDwords" "EnableBrightnessControl=1" in the xorg.conf, the Fn-bright-up and Fn-bright-down keys work out of the box.
With the nouveau driver they don't.
$ ls /sys/class/backlight/
returns acpi_video0 and nv_backlight.
As expected nothing can be done using acpi_video0.
But, surprise! The nv_backlight is working:
$ echo 20 | sudo tee /sys/class/backlight/nv_backlight/brightness
works!
But I don't know how to make my friend xfce knows that the Fn-bright-up and Fn-bright-down should talk with /sys/class/backlight/nv_backlight/brightness instead of /sys/class/backlight/acpi_video0/brightness.
Thank you.
nvidia xfce brightness backlight
edited Jun 14 at 23:19
WinEunuuchs2Unix
34.2k756130
asked May 28 at 1:03
dedalu
13816
I modified the xfce4-power-manager_1.6.1 source code, changing xfpm-backlight-helper.c -> backlight_helper_get_best_backlight(), making it choose the raw backlight type instead of firmware or platform. It's a work for me only fix... Would be nice to have an option to change the preference order.
– dedalu
May 28 at 15:05
add a comment |Â
up vote
1
down vote
favorite
up vote
1
down vote
favorite
I have an old laptop, oldtimer linux fellow, and updated it to xubuntu 18.04.
After some sleep/resume problems with the proprietary nvidia-340 driver, I decided to try the nouveau. Sleep/resume ok. But there is a new problem: the brightness.
Using the proprietary driver, with Option "RegistryDwords" "EnableBrightnessControl=1" in the xorg.conf, the Fn-bright-up and Fn-bright-down keys work out of the box.
With the nouveau driver they don't.
$ ls /sys/class/backlight/
returns acpi_video0 and nv_backlight.
As expected nothing can be done using acpi_video0.
But, surprise! The nv_backlight is working:
$ echo 20 | sudo tee /sys/class/backlight/nv_backlight/brightness
works!
But I don't know how to make my friend xfce knows that the Fn-bright-up and Fn-bright-down should talk with /sys/class/backlight/nv_backlight/brightness instead of /sys/class/backlight/acpi_video0/brightness.
Thank you.
nvidia xfce brightness backlight
edited Jun 14 at 23:19
WinEunuuchs2Unix
34.2k756130
asked May 28 at 1:03
dedalu
13816
I have an old laptop, oldtimer linux fellow, and updated it to xubuntu 18.04.
After some sleep/resume problems with the proprietary nvidia-340 driver, I decided to try the nouveau. Sleep/resume ok. But there is a new problem: the brightness.
Using the proprietary driver, with Option "RegistryDwords" "EnableBrightnessControl=1" in the xorg.conf, the Fn-bright-up and Fn-bright-down keys work out of the box.
With the nouveau driver they don't.
$ ls /sys/class/backlight/
returns acpi_video0 and nv_backlight.
As expected nothing can be done using acpi_video0.
But, surprise! The nv_backlight is working:
$ echo 20 | sudo tee /sys/class/backlight/nv_backlight/brightness
works!
But I don't know how to make my friend xfce knows that the Fn-bright-up and Fn-bright-down should talk with /sys/class/backlight/nv_backlight/brightness instead of /sys/class/backlight/acpi_video0/brightness.
Thank you.
nvidia xfce brightness backlight
edited Jun 14 at 23:19
WinEunuuchs2Unix
34.2k756130
asked May 28 at 1:03
dedalu
13816
edited Jun 14 at 23:19
WinEunuuchs2Unix
34.2k756130
edited Jun 14 at 23:19
WinEunuuchs2Unix
34.2k756130
edited Jun 14 at 23:19
WinEunuuchs2Unix
34.2k756130
34.2k756130
asked May 28 at 1:03
dedalu
13816
asked May 28 at 1:03
dedalu
13816
asked May 28 at 1:03
dedalu
13816
13816
I modified the xfce4-power-manager_1.6.1 source code, changing xfpm-backlight-helper.c -> backlight_helper_get_best_backlight(), making it choose the raw backlight type instead of firmware or platform. It's a work for me only fix... Would be nice to have an option to change the preference order.
– dedalu
May 28 at 15:05
add a comment |Â
I modified the xfce4-power-manager_1.6.1 source code, changing xfpm-backlight-helper.c -> backlight_helper_get_best_backlight(), making it choose the raw backlight type instead of firmware or platform. It's a work for me only fix... Would be nice to have an option to change the preference order.
– dedalu
May 28 at 15:05
I modified the xfce4-power-manager_1.6.1 source code, changing xfpm-backlight-helper.c -> backlight_helper_get_best_backlight(), making it choose the raw backlight type instead of firmware or platform. It's a work for me only fix... Would be nice to have an option to change the preference order.
– dedalu
May 28 at 15:05
I modified the xfce4-power-manager_1.6.1 source code, changing xfpm-backlight-helper.c -> backlight_helper_get_best_backlight(), making it choose the raw backlight type instead of firmware or platform. It's a work for me only fix... Would be nice to have an option to change the preference order.
– dedalu
May 28 at 15:05
add a comment |Â
1 Answer
1
active
oldest
votes
up vote
1
down vote
The nouveau driver now (some time ago it didn't) creates the /sys/class/backlight/nv_backlight and it works. So passing acpi_backlight=vendor to the kernel disables the /sys/class/backlight/acpi_video0. Without acpi_video0, the backlight_helper_get_best_backlight() will return the nv_backlight out of the box.
So, open /etc/default/grub, edit:
GRUB_CMDLINE_LINUX_DEFAULT="[...] acpi_backlight=vendor"
Save and sudo update-grub.
edited May 29 at 14:38
Stephen Rauch
1,1545716
answered May 29 at 13:26
dedalu
13816
Of particular interest to you is this question whereacpi_backlight=vendordidn't work and a custom script was the solution: askubuntu.com/questions/1045624/…
– WinEunuuchs2Unix
Jun 14 at 23:16
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
1
down vote
The nouveau driver now (some time ago it didn't) creates the /sys/class/backlight/nv_backlight and it works. So passing acpi_backlight=vendor to the kernel disables the /sys/class/backlight/acpi_video0. Without acpi_video0, the backlight_helper_get_best_backlight() will return the nv_backlight out of the box.
So, open /etc/default/grub, edit:
GRUB_CMDLINE_LINUX_DEFAULT="[...] acpi_backlight=vendor"
Save and sudo update-grub.
edited May 29 at 14:38
Stephen Rauch
1,1545716
answered May 29 at 13:26
dedalu
13816
Of particular interest to you is this question whereacpi_backlight=vendordidn't work and a custom script was the solution: askubuntu.com/questions/1045624/…
– WinEunuuchs2Unix
Jun 14 at 23:16
add a comment |Â
up vote
1
down vote
The nouveau driver now (some time ago it didn't) creates the /sys/class/backlight/nv_backlight and it works. So passing acpi_backlight=vendor to the kernel disables the /sys/class/backlight/acpi_video0. Without acpi_video0, the backlight_helper_get_best_backlight() will return the nv_backlight out of the box.
So, open /etc/default/grub, edit:
GRUB_CMDLINE_LINUX_DEFAULT="[...] acpi_backlight=vendor"
Save and sudo update-grub.
edited May 29 at 14:38
Stephen Rauch
1,1545716
answered May 29 at 13:26
dedalu
13816
Of particular interest to you is this question whereacpi_backlight=vendordidn't work and a custom script was the solution: askubuntu.com/questions/1045624/…
– WinEunuuchs2Unix
Jun 14 at 23:16
add a comment |Â
up vote
1
down vote
up vote
1
down vote
The nouveau driver now (some time ago it didn't) creates the /sys/class/backlight/nv_backlight and it works. So passing acpi_backlight=vendor to the kernel disables the /sys/class/backlight/acpi_video0. Without acpi_video0, the backlight_helper_get_best_backlight() will return the nv_backlight out of the box.
So, open /etc/default/grub, edit:
GRUB_CMDLINE_LINUX_DEFAULT="[...] acpi_backlight=vendor"
Save and sudo update-grub.
edited May 29 at 14:38
Stephen Rauch
1,1545716
answered May 29 at 13:26
dedalu
13816
The nouveau driver now (some time ago it didn't) creates the /sys/class/backlight/nv_backlight and it works. So passing acpi_backlight=vendor to the kernel disables the /sys/class/backlight/acpi_video0. Without acpi_video0, the backlight_helper_get_best_backlight() will return the nv_backlight out of the box.
So, open /etc/default/grub, edit:
GRUB_CMDLINE_LINUX_DEFAULT="[...] acpi_backlight=vendor"
Save and sudo update-grub.
edited May 29 at 14:38
Stephen Rauch
1,1545716
answered May 29 at 13:26
dedalu
13816
edited May 29 at 14:38
Stephen Rauch
1,1545716
edited May 29 at 14:38
Stephen Rauch
1,1545716
edited May 29 at 14:38
Stephen Rauch
1,1545716
1,1545716
answered May 29 at 13:26
dedalu
13816
answered May 29 at 13:26
dedalu
13816
answered May 29 at 13:26
dedalu
13816
13816
Of particular interest to you is this question whereacpi_backlight=vendordidn't work and a custom script was the solution: askubuntu.com/questions/1045624/…
– WinEunuuchs2Unix
Jun 14 at 23:16
add a comment |Â
Of particular interest to you is this question whereacpi_backlight=vendordidn't work and a custom script was the solution: askubuntu.com/questions/1045624/…
– WinEunuuchs2Unix
Jun 14 at 23:16
Of particular interest to you is this question where
acpi_backlight=vendor didn't work and a custom script was the solution: askubuntu.com/questions/1045624/…– WinEunuuchs2Unix
Jun 14 at 23:16
Of particular interest to you is this question where
acpi_backlight=vendor didn't work and a custom script was the solution: askubuntu.com/questions/1045624/…– WinEunuuchs2Unix
Jun 14 at 23:16
add a comment |Â
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I modified the xfce4-power-manager_1.6.1 source code, changing xfpm-backlight-helper.c -> backlight_helper_get_best_backlight(), making it choose the raw backlight type instead of firmware or platform. It's a work for me only fix... Would be nice to have an option to change the preference order.
– dedalu
May 28 at 15:05