Red Hat Bugzilla – Bug 971784
backlight control keys not working
Last modified: 2015-02-18 08:55:19 EST
Description of problem:
I cannot control the brightness of my laptop (Lenovo T510) screen with the keyboard in RazorQt. This has worked for me in KDE.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. hit Fn+Home/Fn+End
screen goes brighter/darker
writing /sys/class/backlight/acpi_video0/brightness or using xbacklight works
Razor-qt not handles keyboard. This is job of keyboard handlers (like keyboard layout switcher).
Try to use razorqt-globalkeyshortcuts.
(In reply to Eugene A. Pivnev from comment #1)
> Razor-qt not handles keyboard. This is job of keyboard handlers (like
> keyboard layout switcher).
> Try to use razorqt-globalkeyshortcuts.
pardon my ignorance, but ... do you suggest to make sure manually that xbacklight is installed and use razorqt settings to create a key binding between the Fn+PgUp/PgDn combinations and "xbacklight +-N"? for each user separately?
this doesn't look very user-friendly ...
in addition, I'm just not getting the "Razor-qt not handles keyboard" part - how is that possible that hitting Fn+PgUp works for controlling the keyboard light for example, while Fn+PgUp/PgDn does not work?
either both should work, or both should not work, if half of the Fn-combinations works and half does not, that's not a feature, that's cleanly a bug, IMO
(In reply to Karel Volný from comment #2)
> in addition, I'm just not getting the "Razor-qt not handles keyboard" part -
> how is that possible that hitting Fn+PgUp works for controlling the keyboard
> light for example, while Fn+PgUp/PgDn does not work?
> either both should work, or both should not work, if half of the
> Fn-combinations works and half does not, that's not a feature, that's
> cleanly a bug, IMO
Another idea - openbox intercepts _some_ keys. Try to run razorqt over another WM (e.g. kwin or icewm).
I can't test you problem because has no notebook nor special keys on keyboard.
The same here with Laptop Fujitsu Lifebook E8420.
The FN-Keys don't change the backlight. The symbol occurs on the screen, but the backlight doesn't change the brightness. In gnome-shell the slider in the upper right menu works fine.
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
Fedora 20 beta, kernel 3.11.9
(In reply to Rolle from comment #4)
> The same here with Laptop Fujitsu Lifebook E8420.
I have swapped the hardware meanwhile and I don't have RazorQt on the new machine; not exactly in the mood to install it just for testing this, so ... please, if this happens to you on your Lifebook, could you try the suggestion in comment #3 and report back? (NEEDINFO)
The keys doesn't work in RazorQT nor in Gnome 3.10.
What do you mean with "openbox intercepts _some_ keys"?
I can add some hot keys in RazorQT and in Gnome. But what command must I insert?
For me is curious: The slider in gnome works. The laptop keys (FN + F6/F7) reacts in gnome -> the symbol for brightness appera. But I can only change with the keys in 1 step. The bar in the brightness symboll changes only 1 step.
If I change the brightness with the slider and then I try it with the key, the symbol reads at the beginning the correct brightness value and shows the right position of the bar (high brightness -> full bar; middle brightness -> middle bar; dark brightness -> small bar). But I can't change the value to the limits. It is only changeable in 1 step.
Maybe the hotkey reads the actual value correctly, but not the limits and/or the steps to change the level.
Could this possibly be connected to this: https://bugzilla.redhat.com/show_bug.cgi?id=1046085
I have the same issue on two different laptops. Not sure if really is kernel-related or some other component though, I just came across the issue after the Fedora20 updated the first time after a stock installation, so there are many components changed...
For me, on both machines, only the "reduce screen backlight" does not work (which is Fn+F4 on one machine, and Fn+CursorLeft on the other).
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