I can confirm for Lenovo Thinkpad (P15/P17/T15g/T15p/P15v Gen 1) that
backlight control is working now since the last BIOS update Version 1.28
below excerpt from the readme file:
CHANGES IN THIS RELEASE
Version 1.28
[Important updates]
Update includes a security fix.
[New functions or
Thanks, "nvidia.NVreg_RegistryDwords=EnableBrightnessControl=1" works on
Ubuntu 20.04 5.11.0-40-generic with Nvidia driver 495.44 on Lenovo
Legion 15ARH05.
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Thanks Kunal for the update, this regkey is already incorporated in future
released driver.
So we should not have to explicitly define it in near future.
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I had already tried the "EnableBrightnessControl=1" kernel parameter a
year ago but I tried it anyway, no effect. However, trying the
suggestion of @paulplusx I can happily report that brightness works
flawlessly after using
"nvidia.NVreg_RegistryDwords=EnableBrightnessControl=1" with the latest
Hi Kamal / David,
Please confirm if anyone get a chance to try with above suggested regkey.
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https://bugs.launchpad.net/bugs/1905591
Title:
no
Hi All,
Please try with the EnableBrightnessControl =1 as kernel parameter or add it in
xorg.conf file.
You can add it in device section as shown below -
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "NVIDIA RTX A3000 Laptop GPU"
Hi All,
Please try with the EnableBrightnessControl =1 as kernel parameter or add it in
xorg.conf file.
You can add it in device section as shown below -
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "NVIDIA RTX A3000 Laptop GPU"
Hi All,
Please try with the EnableBrightnessControl =1 as kernel parameter or add it in
xorg.conf file.
You can add it in device section as shown below -
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "NVIDIA RTX A3000 Laptop GPU"
Hi All,
Please try with the EnableBrightnessControl =1 as kernel parameter or add it in
xorg.conf file.
You can add it in device section as shown below -
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "NVIDIA
** Changed in: oem-priority
Status: Confirmed => New
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Title:
no brightness control in {455,460} after
** Changed in: oem-priority
Status: New => Confirmed
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Title:
no brightness control in {455,460} after
Now, it works for me (ubuntu 20.04.3) with the kernel (v5.11.0.34.36)
parameter
nvidia.NVreg_RegistryDwords=EnableBrightnessControl=1
And nvidia drivers 460.91.03. No need to do anything else.
The parameter is mentioned in arch wiki
Nothing changed after removing parameter.
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Title:
no brightness control in {455,460} after update from 450
Can you also try to boot the system without parameter without nvidia-
drm.modeset=1 and share test results.
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My content of /sys/class/backlight is just the /acpi_video0 directory.
Ubuntu 20.04.1
kernel 5.8.0-63-generic
Lenovo Legion 5 15ARH05
GTX 1650 Ti
Driver Version: 470.57.02
Brightness control still not working.
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Please list the content of /sys/class/backlight folder.
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Title:
no brightness control in {455,460} after
Hi All,
Please list the content of /sys/class/backlight folder.
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Title:
no brightness control in {455,460}
Just to add to the report by @manzood, this bug affects my variant of y540 as
well.
My complete laptop spec is as follows:
Lenovo Legion Y540
NVIDIA GTX 2060 Mobile
Ubuntu 18.04
kernel 5.4.0-72-generic
and again, the workaround suggested by @sureshot16 does not work, editing
The 460 driver is broken again. No brightness control.
01 May 2021: nvidia-driver-460 (proprietary, tested).
A reboot fixed everything. Reporting this here as it's not a bug with
the driver.
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To add more info on what I tried, I have put it here:
https://askubuntu.com/questions/1329928/legion-5-pro-brightness-control-
doesnt-work-on-ubuntu-20-04-with-nvidia-driver . Surprisingly the
brightness also works on Manjaro (as mentioned in my post) after adding
'Option "RegistryDwords"
As a temporal workaround, this works for me
https://linuxhint.com/display_brightness_commandline/
xrandr --output DP-0 --brightness 0.7
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Same problem on Legion 5 AMD® Ryzen 7 4800h with radeon graphics × 16 RTX 2060
Solution in comment 11 didn't work for me
Also tried some grub commands that did not work.
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It (link above) didn't work for me, even with Kernel 5.10 and 5.11.
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Title:
no brightness control in
Same problem with Legion 5 pro, 5800H+3070. Tried config
https://www.reddit.com/r/GamingLaptops/comments/ls9k5r/legion_5_pro_other_info_64gb_ram_upgrade_linux/
This guy claims that after 'upgrading to Kernel 5.10', 'Blacklisting
noveau drivers', 'changing the .conf file' and 'adding modules in
I have the same problem with Asus Rog Strix (GL502VY). Nvidia 980M.
Ubuntu 20.10, kernel 5.8.0-43-generic. Driver nvidia-driver-460.
Movement of modules to initramfs did not help.
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I have the same problem and the fix in comment #11 fixed it.
I agree with comment #16. I join a copy of my dmesg and Xorg.0.log
before and after the fix. I hope it will be useful.
** Attachment added: "dmesg and Xorg.0.log before and after the fix."
The workaround suggests that there's an interaction between the NVIDIA
driver and another kernel module at play here. Presumably, adding the
NVIDIA kernel modules to the initrd causes them to be loaded before the
other module. Maybe video.ko, which registers its own brightness
handler?
The
Problem persists with nvidia-driver-460 (460.39-0ubuntu0.18.04.1) on
Lenovo X1 Extreme. The comment #11 workaround still works for this
laptop model.
** Description changed:
On my Lenovo X1 Extreme with GPU: NVIDIA Corporation GP107M [GeForce GTX
1050 Ti Mobile]:
WORKS FINE:
I can confirm that this bug affects me too, but unfortunately the
workaround suggested by @sureshot16 that worked for some users here did
not work for me, so I think it wouldn't for some makes and models.
For reference, I'm on a laptop with the following specifications:
Lenovo Legion Y540
NVIDIA
@sureshot16 thanks a lot!! fixes on my system too! (hp omen 15)
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Title:
no brightness control in {455,460}
The workaround outlined by @sureshot16 in comment #11 (add the nvidia
drivers to initramfs) fixes it my Lenovo X1 Extreme too: Brightness
control works again with nvidia-460.32.03, and no pixel garbage on mode
switch either. Thanks, @sureshot16!
** Description changed:
On my Lenovo X1
I tried the fix for a different problem in this link randomly and it
worked for me.
https://forums.developer.nvidia.com/t/problem-driver-nvidia-455-45-01
-on-linux-mint-20-4-6-7/165402
I am adding steps here:
1. Add the following lines to the file "/etc/initramfs-tools/modules"
nvidia
** Changed in: nvidia-graphics-drivers-455 (Ubuntu)
Status: Triaged => In Progress
** Changed in: nvidia-graphics-drivers-455 (Ubuntu)
Status: In Progress => Confirmed
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I have the same problem. My system config is:
Lenovo X1 extreme
NVIDIA 1050 Ti max Q
Ubuntu 20.04
kernel 5.8.0-36-generic
Brightness control works on Nvidia 450 driver and not on Nvidia 460.
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Here's my log
** Attachment added: "nvidia-bug-report.log.gz"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-455/+bug/1905591/+attachment/5451331/+files/nvidia-bug-report.log.gz
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Confirming the bug on HP Omen 15 - with GTX 1070.
Driver 450, brightness works. When installing 455 or 460, latest updates.. it
gets stuck at max brightness. (Using ubuntu 20.04.1)
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: nvidia-graphics-drivers-460 (Ubuntu)
Status: New => Confirmed
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** Description changed:
+ On my Lenovo X1 Extreme with GPU: NVIDIA Corporation GP107M [GeForce GTX
+ 1050 Ti Mobile]:
WORKS FINE:
nvidia-driver-450: 450.102.04-0ubuntu0.18.04.1
NO BRIGHTNESS CONTROL:
nvidia-driver-455: 455.38-0ubuntu0.18.04.1
nvidia-driver-460:
The 460 driver package was installed with the latest updates and I've
rebooted.
For me, at least, it's working perfectly again.
And I made a mistake on my machine type: it's a ThinkPad P73.
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** Description changed:
- On my Lenovo X1 Extreme with GPU: NVIDIA Corporation GP107M [GeForce GTX
- 1050 Ti Mobile]
- Updating to nvidia-driver-455 results in loss of brightness control. On
- boot, the laptop display brightness is somewhat less than fully bright
- and cannot be changed.
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