Hello Calvin,
Tuesday, September 13, 2005, 8:53:27 AM, you wrote:
CG> Doing it in user mode should be easy as pie. see WM_SYSCOMMAND,
CG> SC_MONITORPOWER.
CG> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/userinput/keyboardaccelerators/keyboardacceleratorreference/keyboardacceleratormessages/wm_syscommand.asp
Yes, I know. Problem that after mouse movement or keyboard hitting
display is powered on again. Which is inappropriate absolutely.
CG> The CRTC controller is accessed by v-bios, hardware miniport driver and ACPI
CG> firmware. In windows NT environment, OS and the video driver work together
CG> to make sure they don’t fight.
Yes, agree 100%. Strange that I can’t find in Windows direct API in
kernel mode or in user mode to turning off monitor for desirable
amount of time.
CG> In general, video bios service is mainly used for dos apps, ACPI or SMM
CG> firmware (ACPI generate SMI, and SMM code could make int 10h call). Other
CG> application should not do it. Real video driver for pre-LH OS’s can call int
CG> 10h, but it’s highly discouraged.
Thank you for information.
CG> Calvin Guan (Windows DDK MVP)
CG> NetXtreme Longhorn Miniport Prime
CG> Broadcom Corp. www.broadcom.com
CG> ----- Original Message -----
CG> From: “Sergey Kipnis”
CG> To: “Windows System Software Devs Interest List”
CG> Sent: Monday, September 12, 2005 9:19 AM
CG> Subject: Re[2]: [ntdev] VideoPortInt10 strange behaviour
>> Hello Calvin,
>>
>> Friday, September 9, 2005, 6:53:14 PM, you wrote:
>>
>> CG> A physical (as opposed to your virtual) miniport doesn’t turn off the
>> CG> monitor in this way. Doing so might well confuse the real miniport. I
>> would
>> CG> suggest to use the vendor supplied API to work with stuff like playing
>> with
>> CG> monitor, multiple desktop etc.
>>
>> Problem that I need reasonably universal method for turning off
>> monitors in Windows.
>> And I do not have yet(?) access to vendor API to play.
>>
>> CG> Also, try to avoid videoportint10 if all possible, it’s primarily for
>> CG> physical miniport which actually controls the hardware. video bios is
>> CG> implemented in that piece of hw. Even a physical miniport should not
>> use
>> CG> videoportint10 if all possible. My previous employer even re-architect
>> the
>> CG> driver-video bios interface for this.
>>
>> CG> Calvin Guan (Windows DDK MVP)
>> CG> NetXtreme Longhorn Miniport Prime
>> CG> Broadcom Corp. www.broadcom.com
>>
>>
>> CG> ----- Original Message -----
>> CG> From: “Sergey Kipnis”
>> CG> To: “Windows System Software Devs Interest List”
>> CG> Sent: Friday, September 09, 2005 9:08 AM
>> CG> Subject: [ntdev] VideoPortInt10 strange behaviour
>>
>>
>>>> Hello,
>>>>
>>>> There is one absolutely wild thing I encountered.
>>>>
>>>> I have virtual display driver which may be used to turn off monitor
>>>> using
>>>> VESA interface(through VideoPortInt10).
>>>>
>>>> Everything ok, but customer found one computer on which after changing
>>>> resolution situation changes terrible:
>>>>
>>>> - call from system DLL to VideoPortInt10 does nothing( nevertheles
>>>> VideoPortInt10 returns success)
>>>>
>>>> - call from application.exe to VideoPortInt10 does job - turn off
>>>> monitor( and VideoPortInt10 returns success too).
>>>>
>>>> Access in both cases is the same, i.e.
>>>> dc = CreateDC, ExtEscape(dc, OurCmd) =>
>>>> CallMiniport(IOCTL )=>VideoPortInt10
>>>>
>>>> –
>>>> Best regards,
>>>> Sergey mailto:kipnis@wp.pl
>>>>
>>>>
>>>> —
>>>> Questions? First check the Kernel Driver FAQ at
>>>> http://www.osronline.com/article.cfm?id=256
>>>>
>>>> You are currently subscribed to ntdev as: xxxxx@hotpop.com
>>>> To unsubscribe send a blank email to
>>>> xxxxx@lists.osr.com
>>>>
>>
>>
>>
>> CG> —
>> CG> Questions? First check the Kernel Driver FAQ at
>> CG> http://www.osronline.com/article.cfm?id=256
>>
>> CG> You are currently subscribed to ntdev as: kipnis@wp.pl
>> CG> To unsubscribe send a blank email to
>> CG> xxxxx@lists.osr.com
>>
>>
>>
>> –
>> Best regards,
>> Sergey mailto:kipnis@wp.pl
>>
>>
>> —
>> Questions? First check the Kernel Driver FAQ at
>> http://www.osronline.com/article.cfm?id=256
>>
>> You are currently subscribed to ntdev as: xxxxx@hotpop.com
>> To unsubscribe send a blank email to
>> xxxxx@lists.osr.com
CG> —
CG> Questions? First check the Kernel Driver FAQ at
CG> http://www.osronline.com/article.cfm?id=256
CG> You are currently subscribed to ntdev as: kipnis@wp.pl
CG> To unsubscribe send a blank email to
CG> xxxxx@lists.osr.com
–
Best regards,
Sergey mailto:kipnis@wp.pl