Re: Graphical glitch in all but multiwindow mode over remote desktop

[Erik Fonnesbeck <efonnes at gmail dot com>]

On Mon, Oct 8, 2012 at 7:36 AM, Jon TURNEY <jon.turney@dronecode.org.uk> wrote:
> On 04/10/2012 09:00, Erik Fonnesbeck wrote:
>> This is on Windows Server 2008 R2 with desktop composition enabled
>> over remote desktop and using Cygwin/X 1.12.4 (though I have not seen
>> any release notes mentioning a fix for it, so I'm guessing it is still
>> relevant in the current version).  Windows 7 should be relevant for
>> testing this bug as well.  I do not recall testing without desktop
>> composition enabled for the remote desktop session, and I do not know
>> whether the issue is specific to Windows 7/Server 2008 R2.
>>
>> Multiwindow mode works fine, but all other modes draw on the taskbar
>> instead of in the Cygwin/X window.  I have tried various combinations
>> of settings for the X server, but the behavior is the same in all
>> cases.
> Did you try adding '-engine 1' option to the X server command line?
>
> All modes apart from multiwindow use DirectX drawing by default, and there
> have been reports that doesn't work correctly over RDP.
>
> (From my brief research, this may be related to the DirectX version which Xwin
> uses.  DirectX over RDP, rendering on the host, is supposed to work since
> Vista, but only for DX9 or later clients, and XWin uses an older DX interface)
>

I was unable to reproduce this on my Windows 7 desktop, with desktop
composition enabled or disabled over remote desktop (same version of
Cygwin/X).  It does seem to be specific to desktop composition, as it
seemed to behave fine when I disabled it on the remote desktop
connection to my Windows Server 2008 R2 system (which is a VM with no
3d capabilities, if that's relevant).  Since it isn't used as a
server, after you mentioned DirectX I decided to try installing the
missing DirectX 9 files in case it would have any effect (it didn't).

Adding the '-engine 1' option did make it display properly.

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