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Message-ID: <debe0033-4b18-4660-a1c2-9a505fa58501@dronecode.org.uk>
Date: Tue, 19 May 2026 12:49:33 +0100
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Subject: Re: X server doesn't start
To: Fabio Rossi <rossi.f@inwind.it>
References: <136722204.3589176.1779093670625@mail1.libero.it>
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Cc: cygwin@cygwin.com
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From: Jon Turney via Cygwin <cygwin@cygwin.com>
Reply-To: Jon Turney <jon.turney@dronecode.org.uk>
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On 18/05/2026 09:41, Fabio Rossi via Cygwin wrote:
> I had installed Cygwin with X server on a Windows 10 machine without problems. Now I have converted the same machine to Windows 11 but not I am not able to run X server anymore. I get no meaningful errors. I have tried also reinstalling Cygwin with the same result. Here is the output when running the simplest case:
> 
> $ XWin
> Welcome to the XWin X Server
> Vendor: The Cygwin/X Project
> Release: 1.21.1.21
> OS: CYGWIN_NT-10.0-26200 XXXXXX 3.6.9-1.x86_64 2026-04-21 15:46 UTC x86_64
> OS: Windows 10  [Windows NT 10.0 build 26200] x64
> Package: version 21.1.21-1 built 2026-01-16
> 
> winInitializeScreenDefaults - primary monitor w 1024 h 768
> (--) Windows reports only 2 mouse buttons, defaulting to -emulate3buttons
> XWin was started with the following command line:
> 
> XWin
> 
> (II) xorg.conf is not supported
> (II) See http://x.cygwin.com/docs/faq/cygwin-x-faq.html for more information
> winUpdateDpi - primary monitor native DPI x 96 y 96
> LoadPreferences: /home/pcad/.XWinrc not found
> LoadPreferences: Loading /etc/X11/system.XWinrc
> LoadPreferences: Done parsing the configuration file...
> winDetectSupportedEngines - RemoteSession: yes

Huh, this indicates that you're using RDP (or similar). Is that the 
case?  If so, do things work correctly in a local session?

> winDetectSupportedEngines - DirectDraw4 installed, allowing ShadowDDNL
> winDetectSupportedEngines - Returning, supported engines 00000005

Is the XWin process hung at the point? or has it crashed?

Since it seems like the problem is occurring while initializing DD4, 
perhaps adding the command line argument '-engine 1' might work around it?


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