On 06/28/2011 09:35 PM, Keng-Yu Lin wrote:
> BIOS fires notifications in a constant period with VPC bit 1 set when the
> power cord is unplugged.
>
> This event is not known yet to have any effect, but it makes the
> call to sparse_keymap_report_event() and generates many KEY_UNKNOWNs.
>
> This causes the userspace (Gnome Power Manager in my case) unable
> to enter the idle mode. As the result there is no screensaver showing up,
> no dim backlight, etc.
>
> Signed-off-by: Keng-Yu Lin <kengyu@xxxxxxxxxxxxx>
> ---
> drivers/platform/x86/ideapad-laptop.c | 3 ++-
> 1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
> index bfdda33..820f013 100644
> --- a/drivers/platform/x86/ideapad-laptop.c
> +++ b/drivers/platform/x86/ideapad-laptop.c
> @@ -463,7 +463,8 @@ static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
> ideapad_sync_rfk_state(adevice);
> else if (vpc_bit == 4)
> read_ec_data(handle, 0x12, &vpc2);
> - else
> + else if (vpc_bit == 1) {
> + } else
> ideapad_input_report(priv, vpc_bit);
> }
> }
So far I know this event (coming with vpc_bit=1) is for Lenovo PM utility
on Windows. For most of the machine this event is not implemented in BIOS.
Its ok that we just ignore the event.
I think it will be better if we can let sparse-keymap or any upper level
application to ignore all unknown scancode or KEY_UNKNOWN but so far I do
not know a better way then this patch.
--
To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
