On Mon, 2010-01-25 at 17:45 +0800, luke lin wrote:
> Hi all,
>
> I read the drivers/acpi/video.c:
>
> 895 result = acpi_video_device_lcd_set_level(device, max_level);
> 896 if (result)
> 897 goto out_free_levels;
> 898
> 899 result = acpi_video_device_lcd_get_level_current(device, &level);
> 900 if (result)
> 901 goto out_free_levels;
> 902
> 903 br->flags._BQC_use_index = (level == max_level ? 0 : 1);
> 904
> 905 if (!br->flags._BQC_use_index) {
> 912 for (i = 2; i < br->count; i++)
> 913 if (level_old == br->levels[i])
> 914 level = level_old;
> 915 goto set_level;
> 916 }
> why after level == max_level, it will still need set_level again?
> is this a bug, or it is necessary.
>
Because setting the backlight to max_level is just to check if _BQC uses
indexed value. We need to set the backlight back after this is done.
thanks,
rui
> thx
> luke
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