[Maverick SRU][PATCH 0/2] Enable volume hot keys on Dell All-In-One with broken firmware.

Tim Gardner tcanonical at tpi.com
Tue Jan 11 23:27:57 UTC 2011

On 01/11/2011 10:42 AM, Colin King wrote:
> From: Colin Ian King<colin.king at canonical.com>
> Enable WMI hotkeys on event GUID 02314822-307C-4F66-bf0E-48AEAEB26CC8. This
> enables the volume up and down keys.  This Dell All-In-One enablement also
> has to work around a firmware implementation bug where the WMI _WED method
> should return an integer containing the key code and in fact the method
> incorrectly returns the key code in element zero of a buffer.
> The second patch in this series tidies up the driver by removing a lot of
> redundant code by using sparse keymaps.
> BugLink: http://bugs.launchpad.net/bugs/701530
> Impact: Dell device is lacking volume up/down hotkeys which require
> a WMI driver to handle the WMI hotkey events with the GUID
> 02314822-307C-4F66-bf0E-48AEAEB26CC8.
> Fix: Update dell WMI driver to support GUID 02314822-307C-4F66-bf0E-48AEAEB26CC8.
> and handle firmware bug in _WED method return value.
> Testcase: With the driver, hotkeys work correctly. Without the driver,
> hotkeys don't work.
> Colin Ian King (2):
>    UBUNTU: SAUCE: Add WMI hotkeys support for another Dell All-In-One
>      series
>    UBUNTU: SAUCE: Dell WMI: Use sparse keymaps and tidy up code.
>   drivers/platform/x86/dell-wmi-aio.c |  182 +++++++++++++----------------------
>   1 files changed, 67 insertions(+), 115 deletions(-)

So, I'm not too wild about this patch set. While I'm sure its correct 
(and should go upstream), its a substantial patch and will likely make 
our future maintenance efforts much more difficult since this diverges 
substantially from upstream. How difficult would it be to support this 
via an LBM package or DKMS ?

Is there anyway to write a minimally invasive patch that provides the 
same functionality?

Tim Gardner tim.gardner at canonical.com

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