Red Hat Bugzilla – Bug 610966
Brightness keys do not work on Lenovo W510
Last modified: 2017-12-06 06:07:26 EST
Not 100% sure if this is xorg-x11-server thing, let's start here.
I'm Lenovo W510 I'm able to adjust the LCD brightness on RHEL5 via the hardware keys, but not on RHEL6. When I press the FN+brightness key the brightness indicator pops up, but nothing changes.
I tried using gnome brightness applet and that is working.
Nothing interesting in the logs is shown.
Created attachment 429177 [details]
nvidia gpu, transfer to nouveau.
Can you list the contents of /sys/class/backlight for me please.
here you go:
[root@kovinek ~]# ls -lR /sys/class/backlight/
lrwxrwxrwx. 1 root root 0 Jul 8 12:06 acpi_video0 -> ../../devices/virtual/backlight/acpi_video0
lrwxrwxrwx. 1 root root 0 Jul 8 12:05 nv_backlight -> ../../devices/pci0000:00/0000:00:03.0/0000:01:00.0/backlight/nv_backlight
lrwxrwxrwx. 1 root root 0 Jul 8 12:10 thinkpad_screen -> ../../devices/virtual/backlight/thinkpad_screen
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Just FYI - brightness keys work properly on F13
As the brightness applet is working, it doesn't appear the hw control is at fault. It's probably a problem of getting the brightness keypress through the stack.
I'm not 100% sure who's responsible for this, reassigned to Peter as he may.
please switch to runlevel 3, then start X with "xinit --". This will bring up X and an xterm. In that xterm, run xev and test if you see any events when you hit the brightness buttons.
This will help us narrow down whether it is an issue in X or in the desktop stack.
Yup, events are shown (attaching screenshot).
Created attachment 439680 [details]
reassigning to g-s-d, the key events are delivered.
gnome-settings-daemon doesn't touch the brightness, only gnome-power-manager handles them.
I'm seeing this problem on Fedora 14 on a W510 as well.
David, can you please attach the output for:
And then pressing the brightness buttons a few times. Thanks.
Created attachment 468882 [details]
gnome-power-manager --verbose output
attaching the log. I've pressed brightness-down key twice, brightness-up key twice. Then CTRL+C to quit.
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The issue here is that laptop_panel.brightness_in_hardware is set, i.e. HAL has told gnome-power-manager that the hardware is handling it's own brightness control. This was probably true before nouveau started handling the backlight device. So, the real fix is to fix hal-info to not set this key for the specified hardware now nouveau is new enough to do the right thing.
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