X11 does not start up <winMultiWindowXMsgProc - Fatal error 1 on xcb connection>

[Marco Atzeri]

On 30/01/2025 23:11, Charles Perkins wrote:
> Hello Marco,
> 
> After I modified the permissions I decided to re-run the setup and 
> install of X11.  That did work without any errors.  However, I am still 
> getting the same problem: "winMultiWindowXMsgProc - Fatal error 1 on xcb 
> connection" when I run startxwin.  This was on a fresh invocation of cygwin.
> 
> Attached to this email, please find three files:
> 
>   * /var/log/xwin/XWin.0.log
> 
>   * ~/startxwin.log
> 
>   * ~/cygcheck.out
> 
> Thanks in advance for any help you can provide.
> 
> Regards,
> Charlie P.
> 

please Bottom-Posting on these mailing lists, and trim
the content. It makes easier to follow up

https://en.wikipedia.org/wiki/Posting_style

> 
> On 1/28/2025 7:03 AM, Marco Atzeri wrote:
>> On 27/01/2025 22:01, Charles Perkins via Cygwin wrote:
>>> Hello folks,
>>>
>>> I have had multiple problems trying to install X11 on Cygwin. I am 
>>> running Cygwin on Windows 11 on my Asus VivoBook.
>>>
>>> The initial X11 installation showed Error 3 for the sub-installation 
>>> of xinit.

It should be related to the items on the start menu.
Unlikely related to your issue.


>>> Looking through previous answers, I found a suggestion to run the 
>>> following:
>>>
>>>   CYGWINFORALL=-A /bin/sh -vx /etc/postinstall/xinit.sh   (**)
>>>
>>> This failed with the following error:
>>>
>>>     mkshortcut: Saving "/cygdrive/c/ProgramData/Microsoft/Windows/Start
>>>     Menu/Programs/Cygwin-X/User .xsession script.lnk" failed; does the
>>>     target directory exist?
>>>
>>> Later, after quite a bit of rigamarole involving "takeown" and 
>>> "icacls", I was able to run (**) without any error message.
>>>
>>> So then I tried startxwin, with the following error:
>>>
>>>     winMultiWindowXMsgProc - Fatal error 1 on xcb connection
>>>
>>>
>>> Here is the complete output of startxwin:
>>>
>>> ========================================================================
>>> Welcome to the XWin X Server
>> ...
>>> winMultiWindowXMsgProc - xcb_connect() returned and successfully 
>>> opened the display.
>>> Using Composite redirection
>>> xinit: connection to X server lost
>>>
>>> waiting for X server to shut down winClipboardProc - 
>>> winClipboardFlushWindowsMessageQueue trapped WM_QUIT message, exiting 
>>> main loop.
>>> winMultiWindowXMsgProc - Fatal error 1 on xcb connection
>>> winDeinitMultiWindowWM - Noting shutdown in progress
>>> (II) Server terminated successfully (0). Closing log file.
>>> ==================================================================================
>>>
>>> Thanks in advance for any help you can provide.  If I seem clueless, 
>>> that's pretty much how I feel right now -- sorry!
>>>


I have not seen anything obvious.
It looks like that program reached its end and exit.

Are you trying to use some Window Manager ?
Any .startxwinrc on you $HOME diretory ?
If you run directly XWin , what's happen ?


Jon, the X package maintainer, probably will have better debugging ideas.

One thing I noticed is that you installed almost all available packages.

$ grep "OK$" cygcheck.out | wc -l
7554

Any reason for that ?
https://cygwin.com/faq.html#faq.setup.everything

The golden rule should be "install only what you need";
the system will be lighter as space and responsivness and there are less 
risk of something going wrong.

Just to give you a reference I have only 2632 packages installed and I 
am one of the main packagers as number of packages to take care of.


Regards
Marco