Fn+keys for adjusting brightness not work after updates

[silentdi]

My laptop is Lenovo thinkpad T420, I only use the discrete graphic. So, I
install the nvidia drivers from rpmfusion, and the /etc/X11/xorg.conf file is below:

# RPM Fusion - nvidia-xorg.conf
#
Section "Device"
Identifier "Videocard0"
Driver "nvidia"
Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection

before yesterday's updates everything works ok, I can adjust the LCD brightness with fn+ keys, but after updates, fn+ keys don't work any more.
But, I can adjust the birghtness by doing below:

echo 9 > /sys/class/backlight/acpi_video0/brightness

I don't know what happened, is there a bug in updates introduce this problem.


Thank you!

---------- Post added at 01:24 AM ---------- Previous post was at 12:55 AM ----------

I remember that after updating something like Dbus, the fn+keys don't work anymore. Is the bug of dbus introduce this problem.

[manol99]

Simliar for me. Echo to /sys/class/backlight/acpi_video0 works fine, but if I hit the Fn keys the overlay appears but doesn't change anything.

[undertoad]

I had this problem too. Took a while updating and downgrading packages... it was bash.

For me, the problem goes away when I do yum downgrade bash

Might be related to this post http://forums.fedoraforum.org/showthread.php?t=272450

---------- Post added at 10:52 PM ---------- Previous post was at 10:45 PM ----------

following the bugzilla trail, another fix is after bash update, yum reinstall bash

[silentdi]

I had this problem too. Took a while updating and downgrading packages... it was bash.

For me, the problem goes away when I do yum downgrade bash

Might be related to this post http://forums.fedoraforum.org/showthread.php?t=272450

---------- Post added at 10:52 PM ---------- Previous post was at 10:45 PM ----------

following the bugzilla trail, another fix is after bash update, yum reinstall bash

Yeah, you are right. I solve this problem just reinstall bash by run the command below:

yum reinstall bash

good job, undertoad, thank you!

---------- Post added at 12:22 PM ---------- Previous post was at 12:02 PM ----------

I had this problem too. Took a while updating and downgrading packages... it was bash.

For me, the problem goes away when I do yum downgrade bash

Might be related to this post http://forums.fedoraforum.org/showthread.php?t=272450

---------- Post added at 10:52 PM ---------- Previous post was at 10:45 PM ----------

following the bugzilla trail, another fix is after bash update, yum reinstall bash

I have another problem, do you know how to save the LCD brightness, because every time
after rebooting, the first thing I have to do is adjusting the brightness.
I have post before, by didn't get an answer.

[undertoad]

sorry I don't know, brightness setting is lost after reboot for me.

[silentdi]

sorry I don't know, brightness setting is lost after reboot for me.

ok, thank you all the same.

[troym]

I had this same problem also. I looked at the system log files and found the following message in /var/log/secure:

Nov 15 18:20:40 localhost pkexec[2373]: troym: The value for the SHELL variable was not found the /etc/shells file [USER=root] [TTY=unknown] [CWD=/home/troym] [COMMAND=/usr/libexec/gsd-backlight-helper --set-brightness 1]

Then I looked in /etc/shells and saw that /bin/bash and /bin/sh were missing from the list of shells. Some upgrade must have clobberd that file. Reinstalling bash fixed it.

[donaldm]

My laptop is Lenovo thinkpad T420, I only use the discrete graphic. So, I
install the nvidia drivers from rpmfusion, and the /etc/X11/xorg.conf file is below:

# RPM Fusion - nvidia-xorg.conf
#
Section "Device"
Identifier "Videocard0"
Driver "nvidia"
Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection

before yesterday's updates everything works ok, I can adjust the LCD brightness with fn+ keys, but after updates, fn+ keys don't work any more.
But, I can adjust the birghtness by doing below:

echo 9 > /sys/class/backlight/acpi_video0/brightness

I don't know what happened, is there a bug in updates introduce this problem.


Thank you!

---------- Post added at 01:24 AM ---------- Previous post was at 12:55 AM ----------

I remember that after updating something like Dbus, the fn+keys don't work anymore. Is the bug of dbus introduce this problem.

Thanks for the info.

I have the same problem with the brightness control on my HP dv7 laptop. Basically the up/down control displays and the scale does move up/down however the screen brightness (ie. dull) remains the same.
Changing the "brightness" number (I use 3 to 5) fixes the issue and my laptop brightness is back to normal again.

[PiElle]

yum reinstall bash solved the same problem here!
Great job!

[donaldm]

yum reinstall bash solved the same problem here!
Great job!

Tried a reinstall of bash but that did not work. Not sure why that would work anyway but at least I can control the brightness by putting a number in /sys/class/backlight/acpi_video0/brightness. I only need to set it once and since I only reboot when I get a new kernel the issue is just a minor annoyance. When travelling I just put the laptop to sleep and on wakeup the setting does not change. All users of my laptop (ie wife and son) are ok with a brightness setting of 6.

[grdryn]

I've just reinstalled bash, and it works!

@undertoad, was it just through trial and error you figured out it was bash??

Anyway, nice work, fixes the same problem in Dell XPS m1530.

[AdamW]

note https://fedoraproject.org/wiki/Commo...ash-etc-shells .

[undertoad]

hi grdryn, yes trials and errors, updating/downgrading groups of packages till only bash was left. The post from troym shows a much quicker way to find the problem.

[ssgoku129]

Awesome! Dell XPS 1702x 3D 1080P GT 555M 3GB here:

thought it was the kernel/init upgrade but was having so success... downgraded bash, instant response from brightness controller. updated bash, instantly unrecognized. reinstalled bash (while updated*) and now i'm up to date with brightness control, should make note of this as I assume it may not be the first time we need to use it!

P.S. I should note that this has no effect without the ' Option "RegistryDwords" "EnableBrightnessControl=1" ' in my xorg.conf under Section "Device".

Thanks!

[PiElle]

P.S. I should note that this has no effect without the ' Option "RegistryDwords" "EnableBrightnessControl=1" ' in my xorg.conf under Section "Device".

Same here!