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dvda2k
PostPosted: March 25th, 2009, 5:03 am 
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Joined: April 19th, 2007, 8:05 am
Posts: 48
In Vista and Win 7, you can press Win + X to use Windows Mobility Center to adjust your LCD backlight. Windows Mobility Center talks to your graphics driver.

I searched MSDN and found some articles talking about "Backlight Control Interface". But I just don't know how to implement this code into Autohotkey.

Can anyone help? The MSDN link is here:
http://msdn.microsoft.com/en-us/library/aa372656(VS.85).aspx


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BoBo³
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PostPosted: March 25th, 2009, 9:12 am 
[OT]
OK. We often see 'half-converted' URLs used within the forum, like the following one (taken from above):
http://msdn.microsoft.com/en-us/library/aa372656(VS.85).aspx

The reason is the use of special characters, here ---> ( ), which won't be translated by the forum software phpBB. A quick one to help yourself is to drop the link into Google and search for it. You can extract the (now) converted special characters afterwards from the (converted) link which is shown at the address bar.
http://msdn.microsoft.com/en-us/library ... 85%29.aspx
[/OT]


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BoBo³
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PostPosted: March 25th, 2009, 9:17 am 
OR ...
feel free to have a try to translate the string/URL with Autohotkey. 8)
Quote:
HTML, String: Converts String into its HTML equivalent by translating characters whose ASCII values are above 127 to their HTML names (e.g. £ becomes &pound;). In addition, the four characters "&<> are translated to &quot;&amp;&lt;&gt;. Finally, each linefeed (`n) is translated to <br>`n (i.e. <br> followed by a linefeed).


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dvda2k
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PostPosted: March 25th, 2009, 10:30 am 
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Joined: April 19th, 2007, 8:05 am
Posts: 48
BoBo³, thanks for your reply. Fortunately the MSDN website has some error-proof feature, the broken URL still gets you to the right place.

Do you have any comment on my question itself?


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..:: Free Radical ::..
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PostPosted: September 25th, 2009, 11:05 pm 
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Joined: September 20th, 2006, 2:05 pm
Posts: 73
I humbly second that request for IOCTL_VIDEO_SET_DISPLAY_BRIGHTNESS


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..:: Free Radical ::..
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PostPosted: September 26th, 2009, 12:52 pm 
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Joined: September 20th, 2006, 2:05 pm
Posts: 73
Code:
hLCD = CreateFile( "\\.\LCD" , #GENERIC_READ | #GENERIC_WRITE , #FILE_SHARE_READ | #FILE_SHARE_WRITE , #Null , #OPEN_EXISTING , #Null , #Null )

DeviceIoControl( hLCD , #IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS , #Null , #Null , MDB  , SizeOf ( MDB  ) , @ lReturnedBytes , #Null )

DeviceIoControl( hLCD , #IOCTL_VIDEO_SET_DISPLAY_BRIGHTNESS , SDB , SizeOf ( tDisplayBrightness ) , #Null , #Null , @ returnedBytes , #Null)


Can someone help me write the appropriate dllcall?
Code:
hLCD := DllCall("CreateFile", "str", "\\.\LCD", "Uint", 0, "Uint", 3, "Uint", 0, "Uint", 3, "Uint", 0, "Uint", 0)
SUPPORTED_BRIGHTNESS := DllCall("DeviceIoControl", "Uint", hLCD, "Uint", 0x125, "Uint", 0, "Uint", 0, "str", 0, "str", 256, "Uint", 0, "Uint", 0)


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temp01
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PostPosted: September 26th, 2009, 1:45 pm 
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Joined: July 9th, 2009, 9:25 pm
Posts: 120
Does this work (I don't have an LCD monitor to test)? If not, what does the msgbox show?
Code:
hLCD := DllCall("CreateFile"
   , Str, "\\.\LCD"
   , UInt, 0x80000000 | 0x40000000  ; GENERIC_READ | GENERIC_WRITE
   , UInt, 0x1 | 0x2  ; FILE_SHARE_READ | FILE_SHARE_WRITE
   , UInt, 0
   , UInt, 0x3  ; OPEN_EXISTING
   , UInt, 0, UInt, 0)
if hLCD <> -1
{
   FILE_DEVICE_VIDEO := 0x00000023, METHOD_BUFFERED := 0, FILE_ANY_ACCESS := 0
   VarSetCapacity(DISPLAY_BRIGHTNESS, 3, 0)
      NumPut(0x03, DISPLAY_BRIGHTNESS, 0, "UChar")   ; 0x01 = Set AC, 0x02 = Set DC, 0x03 = Set both
      NumPut(50, DISPLAY_BRIGHTNESS, 1, "UChar")      ; The AC brightness level
      NumPut(50, DISPLAY_BRIGHTNESS, 2, "UChar")      ; The DC brightness level
   Msgbox % ""
   . DllCall("DeviceIoControl"
      , UInt, hLCD
      , UInt, (FILE_DEVICE_VIDEO<<16 | 0x127<<2 | METHOD_BUFFERED<<14 | FILE_ANY_ACCESS) ; IOCTL_VIDEO_SET_DISPLAY_BRIGHTNESS
      , UInt, &DISPLAY_BRIGHTNESS, UInt, 3
      , UInt, 0, UInt, 0
      , UIntP, dwBytesReturned  ; Unused.
      , UInt, 0) "`nErrorLevel:`t`t" ErrorLevel "`nLastError:`t`t" A_LastError
   DllCall("CloseHandle", UInt, hLCD)
}

(based on this code (remarks))


Last edited by temp01 on September 26th, 2009, 2:25 pm, edited 1 time in total.

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..:: Free Radical ::..
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PostPosted: September 26th, 2009, 2:16 pm 
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Joined: September 20th, 2006, 2:05 pm
Posts: 73
Doesn't work :(
I am on a desktop LCD (AC power). Don't have a laptop.

Msgbox Output:

Code:
1
Errorlevel :  0
Last Error:  0


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temp01
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PostPosted: September 26th, 2009, 2:27 pm 
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Joined: July 9th, 2009, 9:25 pm
Posts: 120
Try the code again (fixed NumPut offsets).


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..:: Free Radical ::..
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PostPosted: September 26th, 2009, 2:35 pm 
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Joined: September 20th, 2006, 2:05 pm
Posts: 73
Same output and no effect. Perhaps my LCD doesn't support backlight control.

Can anyone else test this too?


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FreeRadical
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PostPosted: September 26th, 2009, 5:49 pm 
Thanks for al the help temp0 :). I hope we figure this out someday.


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pajenn
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PostPosted: September 26th, 2009, 10:21 pm 
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Joined: February 7th, 2009, 11:28 pm
Posts: 384
Quote:
1
Errorlevel : 0
Last Error: 0


Same here. I can adjust my laptop LCD brightness with fn+f9/f10, but AHK cannot detect the 'fn' key (no sc/vk code) so I cannot remap it -- I'd prefer to use the mouse scroll wheel...

_________________
Hardware: 1.8 GHz laptop with 4 GB ram, Windows XP/SP3
Software: Prevx, Privatefirewall, KeyScrambler.


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temp01
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PostPosted: September 27th, 2009, 12:00 am 
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Joined: July 9th, 2009, 9:25 pm
Posts: 120
I think what you want is SetMonitorBrightness not IOCTL_VIDEO_SET_DISPLAY_BRIGHTNESS


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8
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PostPosted: September 6th, 2010, 7:15 pm 
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Joined: September 6th, 2010, 7:11 pm
Posts: 1
Any ideas how to call DxgkDdiSetBrightness from AutoHotkey? (more info here)
IOCTL is deprecated in Vista/7 and mostly doesn't work anyway, but this method should be the same which is used in the mobility center.
Thanks.


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rcll
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PostPosted: October 20th, 2010, 3:56 pm 
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Joined: October 20th, 2010, 11:48 am
Posts: 4
Sorry to post in this old thread but I'm also looking for this solution.

The Fn keys on my laptop are signaled at BIOS level or something and seem impossible to remap using the HID DLL method to identify the keys.

Windows Mobility Center has a GUI brightness slider that corresponds to the same function, brightness up/brightness down. Can this be mapped to a hotkey?


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