Re: [PATCH] dell-laptop: add parameter to disable the backlight device.

[Alex Davis <alex14641@yahoo.com>]

--------------------------------------------
On Sun, 12/8/13, Levente Kurusa <levex@linux.com> wrote:

> Subject: Re: [PATCH] dell-laptop: add parameter to disable the backlight device.
> To: "Alex Davis" <alex14641@yahoo.com>, "mjg59@srcf.ucam.org" <mjg59@srcf.ucam.org>, >"linux->kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
> Date: Sunday, December 8, 2013, 9:06 AM
 
 
 >>2013-12-08 14:40, Alex Davis:
 >> I have a Dell Inspiron N7010 Laptop with Intel
 graphics. When the dell-laptop module is loaded,
 >> two backlight device devices are created;
 dell_backlight, and intel_backlight from the Intel
 >> graphics driver. The dell_backlight device is
 non-functional, but the graphics subsystem uses
 >> it instead of the functioning intel_backlight device.
 The result is that, when running KDE,
 >> screen brightness cannot be controlled. I've added a
 module parameter, disable_backlight
 >> which, when true, will disable the dell_backlight
 device, and leave only the intel_backlight:
 >> with this, screen brightness can be controlled.
 >> 
 
> Hi,
 
 >I think it would be better if we could figure out why the
 >dell_blacklight device is not working rather than disabling
 >it.
 
 
> Regarding your patch, it creates a memory leak as you:
>  * allocate a platform device
>  * you add it
>  * you allocated a page for SMI
> 
> Your if(disable_blacklight) code should go
> where it checks the DMI.
> 
> -- Regards,
> Levente Kurusa

Levante,

You are correct. The existing code also has a memory leak. I will submit a patch for that.