[Bug 318327] [NEW] cannot control backlight on lenovo t400 with KDE 4

lucky lucas.charles at unine.ch
Sun Jan 18 00:58:15 UTC 2009

Public bug reported:

Binary package hint: kdebase

A strange bug occurs while I'am running KDE 4.2 packages on Jaunty up to date and on Intrepid as well with the backported packages.
I started to use Intrepid with Gnome on my Lenovo t400 with Intrepid and the backlight was ok, even if it had some strange way to repond to the key events, at least I could manage it, and in Intrepid it is solved by just using a 2.6.28 kernel under Gnome.
But with KDE 4.2, there is no way for me to even change in any way the backlight setting, here is an extract of my dmesg , which pretty much says it should be able to change the backlight  (proof is that gnome is able):

[   11.283115] thinkpad_acpi: Lenovo ThinkPad T400, model 2767AK3               
[   11.284326] thinkpad_acpi: radio switch found; radios are disabled           
[   11.284419] thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver                                  
[   11.284421] thinkpad_acpi: Disabling thinkpad-acpi brightness events by default...                                                                           
[   11.292082] Registered led device: tpacpi::thinklight                        
[   11.292127] Registered led device: tpacpi::power                             
[   11.292156] Registered led device: tpacpi:orange:batt                        
[   11.292184] Registered led device: tpacpi:green:batt                         
[   11.292213] Registered led device: tpacpi::dock_active                       
[   11.292240] Registered led device: tpacpi::bay_active                        
[   11.292268] Registered led device: tpacpi::dock_batt                         
[   11.292297] Registered led device: tpacpi::unknown_led                       
[   11.292334] Registered led device: tpacpi::standby                           
[   11.294468] thinkpad_acpi: Standard ACPI backlight interface not available, thinkpad_acpi native brightness control enabled                                  
[   11.294473] thinkpad_acpi: detected a 16-level brightness capable ThinkPad   
[   11.294800] input: ThinkPad Extra Buttons as /devices/virtual/input/input9   
[   11.393378] HDA Intel 0000:00:1b.0: PCI INT B -> GSI 17 (level, low) -> IRQ

For more information don't hesitate to contact me,
Best regards 

** Affects: kdebase (Ubuntu)
     Importance: Undecided
         Status: New

cannot control backlight on lenovo t400 with KDE 4
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