On Friday, September 19, 2014 10:01:18 AM Aaron Lu wrote:
> The ThinkPad X201s has a working ACPI video backlight interface and is
> shipped before Win8; then there is BIOS update that starts to query
> _OSI("Windows 2012") and that would make our video module stop creating
> backlight interface and caused problem for the user. Add it to the DMI
> table to disable native backlight to fix this problem.
>
> LINK: https://bugzilla.kernel.org/show_bug.cgi?id=81691
> LINK: https://bugzilla.kernel.org/show_bug.cgi?id=51231
> Cc: 3.16+ <stable@xxxxxxxxxxxxxxx> # 3.16+
> Reported-and-tested-by: Yves-Alexis Perez <corsac@xxxxxxxxxx>
> Signed-off-by: Aaron Lu <aaron.lu@xxxxxxxxx>
Queued up for 3.17-rc7, thanks!
> ---
> drivers/acpi/video.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
> index fcbda105616e..8e7e18567ae6 100644
> --- a/drivers/acpi/video.c
> +++ b/drivers/acpi/video.c
> @@ -750,6 +750,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
> DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
> },
> },
> + {
> + .callback = video_disable_native_backlight,
> + .ident = "ThinkPad X201s",
> + .matches = {
> + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
> + DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
> + },
> + },
>
> /* The native backlight controls do not work on some older machines */
> {
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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