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This is a regression from the behaviour of Kubuntu 13.04, it seems to be
caused both by the kernel upgrade and the KDE upgrade. When changing
brightness with the laptop function keys, key presses don't correspond
to supported brightnesses in the display, and the brightness bar is not
displayed.
My laptop is a Thinkpad X230 with an i7-3520M and integrated intel
graphics.
On Kubuntu 13.04 with stock packages:
Screen brightness hotkeys work as expected. Increment/decrement in steps of 10,
brightness indicator is displayed by KDE.
On Kubuntu 13.04 with KDE 4.11 backport packages from the Kubuntu PPA:
Screen brightness hotkeys still increment/decrement in steps of 10, brightness
indicator is not displayed.
On Kubuntu 13.04 with 3.12 mainline kernel from PPA, and stock KDE packages:
Screen brightness keys increment/decrement in steps of 1. Needs 10 button
presses for display brightness to change.
On Kubuntu 13.10 daily build *OR* Kubuntu 13.04 with 3.12 mainline kernel and
KDE 4.11 backport packages:
Needs 10 button pressses for display brightness to change, no brightness
indicator displayed. There also seems to be desync between brightness in the
battery monitor applet, and the actual screen brightness.
Expected behaviour:
Same as 13.04 with stock packages.
Please let me know what other info I can provide.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: bot-comment
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brightness hotkeys don't work properly in 13.10 on thinkpad x230
https://bugs.launchpad.net/bugs/1230419
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