How do I manually turn on the light

James Cobban webmaster at
Mon Feb 11 09:49:51 PST 2013

On 13-02-11 08:32 AM, Alex Deucher wrote:
> On Sat, Feb 9, 2013 at 4:03 PM, James Cobban <webmaster at> wrote:
>> I am running Ubuntu 12.10 on a Dell laptop with VGA compatible controller:
>> Advanced Micro Devices [AMD] nee ATI BeaverCreek [Mobility Radeon HD 6620G].
>> The Xorg driver works well except that when I close and reopen the laptop
>> and the system resumes the light is not turned on to illuminate the LCS
>> display.  Can I manually turn the light on?  If so how?  I don't see any
>> activity on related bugs since 2010.
>> I have had to switch back to the proprietary fglrx driver despite its
>> problems because being able to close and reopen my laptop is higher priority
>> than the improved display characteristics of the Xorg driver.
> What kernel are you using?  Does manually adjusting the backlight
> controls after resume fix the issue?  Are you using the acpi backlight
> interface or the radeon specific backlight interface?  Open a bug
> ( and attach your xorg log and dmesg
> output.
> Alex
Ubuntu 12.10 with kernel 3.5.0-23-generic.  I am just running with 
whatever configuration the Ubuntu "Additional Drivers" graphical tool 
activates.  I do not know what that is.  I have no idea how to manually 
adjust the backlight controls, but the light is completely off, so I 
think that would be pointless.  I tried using "radeontool light on" to 
turn the light on, because I could see that command being issued by the script, but that did nothing.  I am not familiar with the 
capabilities of the acpi interface.  I just want to turn the light on!  
I would not be asking if I knew what to do. I do not believe there is an 
intrinsic problem that needs a bug fix.  The actual resume seems to be 
working fine.  For example I can telnet into the resumed system.  I 
think this is just a configuration error in Ubuntu for this particular 
hardware.  For example I get exactly the same behavior if I switch to 
the fglrx driver, using the "Additional Drivers" script, and then forget 
to run the "aticonfig --initial" script.  So I am confident that all I 
have to do is find the right command to turn the light on.

I do not know what I am doing, so just tell me what to try.


Jim Cobban webmaster at 
<mailto:webmaster at>
Web-site: <>
34 Palomino Dr.
Kanata, ON, CANADA
K2M 1M1
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