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dvda2k
Joined: 19 Apr 2007
Posts: 45
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 Posted: Wed Mar 25, 2009 4:03 am Post subject: How to adjust display brightness? (I'm sure it's possible) |
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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
Guest
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| Posted: Wed Mar 25, 2009 8:12 am Post subject: |
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[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/aa372656%28VS.85%29.aspx
[/OT] |
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BoBo³
Guest
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| Posted: Wed Mar 25, 2009 8:17 am Post subject: |
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OR ...
feel free to have a try to translate the string/URL with Autohotkey.  | 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 £). In addition, the four characters "&<> are translated to "&<>. Finally, each linefeed (`n) is translated to <br>`n (i.e. <br> followed by a linefeed). |
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dvda2k
Joined: 19 Apr 2007
Posts: 45
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| Posted: Wed Mar 25, 2009 9:30 am Post subject: |
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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 ::..
Joined: 20 Sep 2006
Posts: 72
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| Posted: Fri Sep 25, 2009 10:05 pm Post subject: |
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| I humbly second that request for IOCTL_VIDEO_SET_DISPLAY_BRIGHTNESS |
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..:: Free Radical ::..
Joined: 20 Sep 2006
Posts: 72
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| Posted: Sat Sep 26, 2009 11:52 am Post subject: |
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| 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)
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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
Joined: 09 Jul 2009
Posts: 120
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| Posted: Sat Sep 26, 2009 12:45 pm Post subject: |
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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 Sat Sep 26, 2009 1:25 pm; edited 1 time in total |
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..:: Free Radical ::..
Joined: 20 Sep 2006
Posts: 72
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| Posted: Sat Sep 26, 2009 1:16 pm Post subject: |
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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
Joined: 09 Jul 2009
Posts: 120
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| Posted: Sat Sep 26, 2009 1:27 pm Post subject: |
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| Try the code again (fixed NumPut offsets). |
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..:: Free Radical ::..
Joined: 20 Sep 2006
Posts: 72
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| Posted: Sat Sep 26, 2009 1:35 pm Post subject: |
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Same output and no effect. Perhaps my LCD doesn't support backlight control.
Can anyone else test this too? |
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FreeRadical
Guest
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| Posted: Sat Sep 26, 2009 4:49 pm Post subject: |
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Thanks for al the help temp0  . I hope we figure this out someday. |
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pajenn
Joined: 07 Feb 2009
Posts: 384
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| Posted: Sat Sep 26, 2009 9:21 pm Post subject: |
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| Quote: | 1
Errorlevel : 0
Last Error: 0
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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
Joined: 09 Jul 2009
Posts: 120
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8
Joined: 06 Sep 2010
Posts: 1
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| Posted: Mon Sep 06, 2010 6:15 pm Post subject: |
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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
Joined: 20 Oct 2010
Posts: 4
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| Posted: Wed Oct 20, 2010 2:56 pm Post subject: |
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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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