On Sun, Nov 15, 2015 at 08:32:47PM -0700, Azael Avalos wrote:
> If transflective backlight is supported and the brightness is zero
> (lowest brightness level), the set_lcd_brightness function will activate
> the transflective backlight, making the LCD appear to be turned off.
>
> This patch fixes the issue by incrementing the brightness level, and
> by doing so, avoiding the activation of the tranflective backlight.
So... I'm not sure this is a bug or even wrong behavior. The lowest setting on
my Thinkpad Yoga 12 is also "off" in Linux. Same is true for my Mac Book Pro (in
Mac OS X).
>From what I can tell, what this patch does is merely disable the lowest setting.
What is it about this behavior that is considered to be wrong?
>
> Cc: <stable@xxxxxxxxxxxxxxx> # 4.3+
> Reported-and-tested-by: Fabian Koester <fabian.koester@xxxxxxxxxxxx>
> Signed-off-by: Azael Avalos <coproscefalo@xxxxxxxxx>
> ---
> drivers/platform/x86/toshiba_acpi.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
> index 2ca3f91..b6a7dc9 100644
> --- a/drivers/platform/x86/toshiba_acpi.c
> +++ b/drivers/platform/x86/toshiba_acpi.c
> @@ -2634,6 +2634,14 @@ static int toshiba_acpi_setup_backlight(struct toshiba_acpi_dev *dev)
> brightness = __get_lcd_brightness(dev);
> if (brightness < 0)
> return 0;
> + /*
> + * If transflective backlight is supported and the brightness is zero
> + * (lowest brightness level), the set_lcd_brightness function will
> + * activate the transflective backlight, making the LCD appear to be
> + * turned off, simply increment the brightness level to avoid that.
> + */
> + if (dev->tr_backlight_supported && brightness == 0)
> + brightness++;
> ret = set_lcd_brightness(dev, brightness);
> if (ret) {
> pr_debug("Backlight method is read-only, disabling backlight support\n");
> --
> 2.6.2
>
>
--
Darren Hart
Intel Open Source Technology Center
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