How do I manually turn on the light

Alex Deucher alexdeucher at
Mon Feb 11 05:32:55 PST 2013

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


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