RE: Rotating the display using ChangeDisplaySettingsEx

Hi Jeffrey,

Thanks for your reply.

I have been unsure whether it was necessary to set the resolution when I
rotate or not. But I have tried doing it, and it did not help.

I have sent you a C++ solution via email that that sets both resolution and
orientation. Running it gives the DISP_CHANGE_BADMODE return when I run it on
my XP Professional/NVIDIA system.

I have tested on a PC with Intel 915 integrated graphics card (this is
actually the target system that our application will run on). It was using XP
Professional and Intel's IEGD 7.0 (embedded) graphics driver. On this system
I get identical results.

Upgrading to IEGD 8.0 drivers did not help.

Running on a PC with XP Professional, Intel 965 chipset and Intels mobile
driver, the program succeds!

So, are NVIDIAs and Intels IEGD drivers not supporting
ChangeDisplaySettingsEx, while Intels mobile driver is?

Is there a workaround? Any alternative API I can use?

I can change the rotation with no problems using NVIDIAs display setup
dialog and with Intels IEGD display configuration tool.


Best regards,
Mikael

""Jeffrey Tan[MSFT]"" wrote:

Hi Mikael,

The code below looks like incomplete - there's no resolution set. If that's
really the complete code, then that's probably the cause of the failure. A
rotation is also a resolution change (e.g. 1024x768 -> 768x1024) and you
have to specify the new resolution for it to be accepted since a mode of
1024x768x90 degrees is not a valid mode.

Have you tried your code on other machines? I find some other cases
regarding ChangeDisplaySettingsEx+DM_DISPLAYORIENTATION which are display
driver dependent. So, if your code runs well on other machines while fails
on this specific machine, it is very likely a driver problem.

If adding the valid resolution setting still did not resolve this problem,
can you provide a simple sample project for me to reproduce this problem?

Finally, based on my research on my colleague's Vista Intel display card
Dell machine, the display configuration application igfxcfg.exe internally
communicates with igfxdev.exe which also calls ChangeDisplaySettingsExA API
with DM_DISPLAYORIENTATION and other flags to rotate the screen.

I will wait for your further feedback, thanks.

Best regards,
Jeffrey Tan
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