Re: [PATCH] ACPI video: ignore BIOS initial backlight value for HP m4

[Aaron Lu <aaron.lu@intel.com>]

On 05/28/2013 10:05 AM, Alex Hung wrote:
> On HP m4 lapops, BIOS reports minimum backlight on boot and
> causes backlight to dim completely. This ignores the initial backlight
> values and set to max brightness.
> 
> Buglink: https://bugs.launchpad.net/bugs/1184501

Same here, but since there is no acpidump attached, I'm not that sure.

Thanks,
Aaron

> 
> Signed-off-by: Alex Hung <alex.hung@canonical.com>
> ---
>  drivers/acpi/video.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
> index 5b32e15..d0937ab 100644
> --- a/drivers/acpi/video.c
> +++ b/drivers/acpi/video.c
> @@ -464,6 +464,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
>  		DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
>  		},
>  	},
> +	{
> +	 .callback = video_ignore_initial_backlight,
> +	 .ident = "HP Pavilion m4",
> +	 .matches = {
> +		DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
> +		DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"),
> +		},
> +	},
>  	{}
>  };
>  
>