[Bug 1518473] Re: /sys/class/backlight/acpi_video0/brightness is broken
I have also this problem with Clevo P775DM3. With one (big) difference, neither xbacklight nor nvidia-settings works in my case :( -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1518473 Title: /sys/class/backlight/acpi_video0/brightness is broken To manage notifications about this bug go to: https://bugs.launchpad.net/system76/+bug/1518473/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1518473] Re: /sys/class/backlight/acpi_video0/brightness is broken
link-dupont really nailed it! I am having the same issue on an HP
Elitebook 8770w with ONLY an NVIDIA Quadro K3000M, using the proprietary
driver version 387.34 on Fedora 27, Kernel 4.14.3-300
I tried all:
acpi_backlight=video
acpi_backlight=vendor
acpi_backlight=native
to no avail, so removed all of that and installed inotify-tools, I do
have /sys/class/backlight/acpi_video0 so I ended up with the following
script in /home/YOURUSERHERE/Scripts/backlight_inotify.sh
#!/bin/sh
path=/sys/class/backlight/acpi_video0
luminance() {
read -r level < "$path"/actual_brightness
factor=$((100 / max))
printf '%d\n' "$((level * factor))"
}
read -r max < "$path"/max_brightness
nvidia-settings -n -a BacklightBrightness="$(luminance)"
inotifywait -me modify --format '' "$path"/actual_brightness | while read; do
nvidia-settings -n -a BacklightBrightness="$(luminance)"
done
And then created file brightnessfix.desktop under
/home/YOURUSERHERE/.config/autostart
[Desktop Entry]
Name=Brightness Fix
Exec=/home/YOURUSERHERE/Scripts/backlight_inotify.sh
Terminal=false
Type=Application
Name[en_US]=backlightfix.desktop
It is a very effective workaround, thanks.
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Title:
/sys/class/backlight/acpi_video0/brightness is broken
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[Bug 1518473] Re: /sys/class/backlight/acpi_video0/brightness is broken
Same issue with GTX 980M on Ubuntu 16.04, even with latest NVIDIA drivers (367.27). I described this on NVIDIA forums: https://devtalk.nvidia.com/default/topic/942337/linux/backlight-brightness-not-hooked-to-acpi-events-ubuntu-16-04-/ I manually fixed it by created an acpid event handler, however in my solution, it only works when changing the brightness with the Fn-keys, but not by changing /sys/class/backlight/acpi_video0/brightness value. Link Dupont's fix works better (but I didn't use video.use_native_backlight=1 on GRUB_CMDLINE_LINUX as he said). By the way, the link to his solution is dead. This one works: http://sub- pop.net/post/fedora-23-on-system76-oryx-pro/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1518473 Title: /sys/class/backlight/acpi_video0/brightness is broken To manage notifications about this bug go to: https://bugs.launchpad.net/system76/+bug/1518473/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1518473] Re: /sys/class/backlight/acpi_video0/brightness is broken
Status changed to 'Confirmed' because the bug affects multiple users. ** Changed in: nvidia-graphics-drivers-352 (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1518473 Title: /sys/class/backlight/acpi_video0/brightness is broken To manage notifications about this bug go to: https://bugs.launchpad.net/system76/+bug/1518473/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1518473] Re: /sys/class/backlight/acpi_video0/brightness is broken
Link, Your write-up for getting this working on Fedora is great, thanks! We're considering adding something like this to the system76-daemon assuming Nvidia isn't going to support this mechanism any more. Thanks again! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1518473 Title: /sys/class/backlight/acpi_video0/brightness is broken To manage notifications about this bug go to: https://bugs.launchpad.net/system76/+bug/1518473/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1518473] Re: /sys/class/backlight/acpi_video0/brightness is broken
I encountered the same issue when installing Fedora 23 onto my Oryx Pro (I know Fedora isn't supported, etc.). I found a solution on the Archlinux wiki that talks about using inotify to watch for changes to the brightness file and run xbacklight to adjust the backlight levels. For my own sake, I documented it, but this might help for you on Ubuntu. It really sounds like a regression with the proprietary NVIDIA drivers. Maybe a similar file-monitoring could be incorporated into system76-daemon? http://www.moxbant.net/fedora-23-on-system76-oryx-pro/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1518473 Title: /sys/class/backlight/acpi_video0/brightness is broken To manage notifications about this bug go to: https://bugs.launchpad.net/system76/+bug/1518473/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1518473] Re: /sys/class/backlight/acpi_video0/brightness is broken
** Changed in: system76 Status: New => Triaged ** Changed in: system76 Importance: Undecided => High ** Changed in: system76 Assignee: (unassigned) => Jason Gerard DeRose (jderose) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1518473 Title: /sys/class/backlight/acpi_video0/brightness is broken To manage notifications about this bug go to: https://bugs.launchpad.net/system76/+bug/1518473/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
