[PATCH 3/4] (drop after 3.0) ideapad: add backlight driver

Ike Panhc ike.pan at canonical.com
Wed Aug 24 14:07:24 UTC 2011

There is a bug with this patch is found and it will cause kernel panic when
hit backlight off hotkey if acpi_backlight=video

The patch[1] has been sent to platform-x86 list and I have revised the

[1] http://www.mail-archive.com/platform-driver-x86@vger.kernel.org/msg02340.html

[2] http://www.mail-archive.com/platform-driver-x86@vger.kernel.org/msg02343.html

I will monitor the landing of this patch and make the cherry-pick.

On 08/11/2011 05:28 PM, Ike Panhc wrote:
> When acpi_backlight=vendor in cmdline or no backlight support in acpi video
> device, ideapad-laptop will register backlight device and control brightness
> and backlight power via the command in VPC2004.
> Signed-off-by: Ike Panhc <ike.pan at canonical.com>
> Signed-off-by: Matthew Garrett <mjg at redhat.com>
> (cherry picked from mainline commit a4ecbb8ae7be16497db2f984ee7a3ffec0f164c3)
> ---
>  drivers/platform/x86/ideapad-laptop.c |  123 +++++++++++++++++++++++++++++++--
>  1 files changed, 117 insertions(+), 6 deletions(-)

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