RE: SVGA, LCD, Win CE 6.0 and PB
- From: MichaelH <MichaelH@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 5 Aug 2008 07:37:03 -0700
Hello John...
Do you have the following registry: [HKLM]/Drivers/Display/LCDC
or something along this line defined in your BSP? It could be that the CE 6
driver is getting some bad information from the registry and changing the
display.
Good luck.
Michael H.
"John" wrote:
Hi,.
The orignal discussion of my problem is listed under "A black strip on right
side of LCD" which may be too long to read. So, I summarize my problem and
findings in one post here:
The problem:
I run Win CE 6.0 on an AMD CPU based SBC (Single board computer) board. I've
got a black (blank) strip (100 pixels wide) at the right side of the LCD
covering (or say, cut off) portion of the desktop image.
What I've found:
1) I've got full 800 pixel wide desktop image when I run Win XP on the same
board with the same LCD.
2) The BIOS image on the LCD is fine. It extends to the edge of the LCD
screen.
3) I drive a CRT and an LCD simultaneously. While I have a black (blank)
strip on the LCD, the image on CRT is ok (full 800 pixels wide).
4) When I select the LCD resolution setting in BIOS, the LCD clock rate and
synch signals change accordingly. I have measured the timing of each signals
at different settings. They were correct for that setting. Only the SVGA
setting gives me a stable LCD display. The change of LCD modes in BIOS
affects image size on CRT but I’ve got a full desktop image on CRT no matter
what LCD mode I select.
5) I played with resolution settings in boot.ini (w/ BIOS set at SVGA).
Except the 800x600 setting, every other setting (higher or lower) actually
shows a smaller image on both (CRT and LCD) screens with black (blank) strips
all round. The actual resolution changes accordingly. On LCD screen in
addition to the blank strip I still lose 1-2% desktop image at the right side
(with SVGA setting, I lose 100/800=12.5%. What I lose is excatly the width of
the blank strip).
6) Under SVGA resolution, if I move the mouse pointer behind the blank strip
and do right-click, I can bright up a menu window. So, to the mouse, the
screen resolution is SVGA.
7) My board can not read EDID. If I set BIOS read customer EDID, the LCD
display is blank.
The help I need:
1) Can anyone guess who the possible culprit of this problem is?
2) How can I troubleshoot (trace) this problem with PB?
My board vendor thinks this is a display driver problem. But they use AMD
BSP and they don't have detailed information (e.g. source code) about the
driver. I doubt this is a display driver problem. Maybe I am wrong but I
would think different display driver may provide some special features such
as being efficient in some regards. But all of them should be able to drive a
full desktop image, especially the display driver provided by AMD which
should at least be tested for generic capabilities. Right?
Hey, I am stuck. I even don't know what kind of experties to look for to
solve this problem. Can anyone can shed me a light? Many thanks in advnace.
John
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