Blank screen - Video card problem

[Perro Flaco]

Hi everybody!

My operating system works pretty well. After FBA all hardware devices
are installed and everything seems to be ok. However something strange
appears when I disconnect the screen from the motherboard. Although the
operating system starts up ok without the screen, when I connect the
screen again to the VGA, I cannot see anything in the screen. I mean,
the operating system starts up, but I got a wonderful blank screen. I
have to use F8 when the operating system is starting, and choose
"Enable VGA mode" to see something (in fact, when I do this, the
resolution has changed to 640x480, and if I try to change it again to
800x600, I got a blank screen again, and I have to turn off the
computer because there is nothing a I can do to change this behavior).

Any advice? I've included a component with the driver of the video
card, and the "display control panel" component. Am I forgetting
something?

Thank you very much for your help!

 

[Adora Belle Dearheart]

Hi everybody!

My operating system works pretty well. After FBA all hardware devices
are installed and everything seems to be ok. However something strange
appears when I disconnect the screen from the motherboard. Although the
operating system starts up ok without the screen, when I connect the
screen again to the VGA, I cannot see anything in the screen. I mean,
the operating system starts up, but I got a wonderful blank screen. I
have to use F8 when the operating system is starting, and choose
"Enable VGA mode" to see something (in fact, when I do this, the
resolution has changed to 640x480, and if I try to change it again to
800x600, I got a blank screen again, and I have to turn off the
computer because there is nothing a I can do to change this behavior).

Any advice? I've included a component with the driver of the video
card, and the "display control panel" component. Am I forgetting
something?

Thank you very much for your help!

I had a similar issue which was caused by the machine assuming that if
there was nothing connected to the VGA that I wanted to use the onboard
flat panel thingyummy which I don't think even had a connector. It was
eventually fixed with a BIOS update.

 

[Zirong Wang]

if you have intel 852/855 display adapter, this is the 'normal'
behavior.

 

[Guest]

hello all,
The same problem is what I am facing. I am using VIA EPIA-CN
motherboard(1.3GHz). But at the time of FBA it was all ok. the image booted
properly evrthing was ok and working fine but suddenly the display goes off.
and dont know why but with onboard VGA it was not working. but if i connected
a external VGA Card display was coming on it.
So is it a XP Embedded issue or is realted to hardware. How can i resolve
the issue.
please help.

 

[Perro Flaco]

Yes, this is my display adapter (Intel 852GM), so now I see it is not a
problem with my operating system image. But I also realise that I can't
solve the problem

Thank you!

Zirong Wang ha escrito:

 

[Zirong Wang]

Bingo. to cope with this problem I use the following script
(launched using startup policy, don't ask me)

------------------------------------------------------------------------
:: set display ID to accomodate any subsequently connected display type
set RegKey=HKLM\HARDWARE\DEVICEMAP\VIDEO
set HKLMKey=HKLM\System\CurrentControlSet
for /F "tokens=7* delims=\" %%A in ('reg query "%RegKey%" ^| findstr /I
"video0"') do (
reg add "%HKLMkey%\%%B" /v DisplayDeviceMode /t REG_BINARY /d
01000000 /f >nul
reg add "%HKLMkey%\%%B" /v Display1_UID1 /t REG_BINARY /d 00000303 /f

nul

reg add "%HKLMkey%\%%B" /v Display1_UID2 /t REG_BINARY /d 00000001 /f

nul

)

------------------------------------------------------------------------
you can write a C program if you don't like .bat script
note that it must be launched with admin priviledge.

852/855 display adapter are usually used by laptop where the screen
is ALWAYS present, so no problem for intel, but many problems for
us, poor embedded engineers.

HTH

Zirong

 

[Bing.Chen]

Dear Perro Flaco,

You are able to use Intel IEGD driver instead of extreme driver.

This problem doesn't occur in this one.

Please visit following link for more information of IEGD.
http://www.intel.com/design/intarch/swsup/graphics_drivers.htm

--
Best Regards,
Bing Chen
Advantech Co., Ltd.

?? - ???????????????
http://www.advantech.com.tw/epc/newsletter/ATW/2005MS/

 

[Perro Flaco]

This driver works pretty well! Thank you!

Now, Im going to try the script that Zirong Wang told me.

Thanks, thanks, thanks!!!


Bing.Chen ha escrito:

 

[jrevanswork]

I don't believe it, Intel finally fixed this problem! I've been
struggling with this stupid problem for quite some time now. Here's my
original thread on this:

http://groups.google.com/group/micr...p.embedded/browse_frm/thread/a72e2f0f00490e94

All of the software solutions that I tried didn't work and I ended up
using the bloated desktop driver and enabled hotkeys, so that
Ctrl-Alt-F1 would re-enable the VGA port. Definitely not an elegant
solution, but it was a way around the problem....

I just tried the new IEGD 5.1 driver and to my suprise, it works. My
Java applications no longer render incorrectly and it doesn't matter if
I power up with or without a device connected to the VGA connector:
whenever I plug a monitor in, the video comes on. Excellent!

Jim Evans
R&D Software Engineer