Slow response to keypresses in xorg-server-1.8.0-1

[Ken Brown]

On 5/1/2010 9:49 AM, Ken Brown wrote:
> I'm often seeing a very slow response to keypresses under
> xorg-server-1.8.0-1.  The problem is intermittent, but it always happens
> within a few minutes after starting the server (via the start menu
> shortcut or a slight variant).  Here are some examples:
>
> 1. Switching windows with Alt-Tab sometimes takes up to 15 seconds or
> doesn't work at all (i.e., I get tired of waiting to see if the focus is
> ever going to switch).
>
> 2. When using 'less' to view a file in an xterm window, there is
> sometimes a delayed response to 'space' or 'q'.
>
> 3. When viewing a directory in emacs-X11, pressing 'v' to start viewing
> a file can sometimes result in a long delay, pressing 'space' to scroll
> in view mode can be slow, and pressing 'q' to exit view mode can be slow.
>
> In some of these cases, I sometimes don't get a response to the first
> keypress until I press a second key.  For example, if I'm viewing a file
> with 'less', I may press 'q' and get no response.  Then pressing 'q' a
> second time exits 'less' and also produces an echoed 'q' in xterm.
> Similarly, I'll sometimes press a key, see no echo, and then get two
> characters echoed at once after pressing a second key.
>
> Reverting to xorg-server-1.7.6-2 solves the problem.
>
> I'm attaching cygcheck output and an XWin log.

I found a test case that I can reproduce reliably on my system.

1. With no .Xdefaults or .startxwinrc, start the X server via the start 
menu shortcut.

2. Start xfig (with 'xfig &' in the xterm window).

3. Repeatedly press Alt-Tab to switch between the xterm and xfig 
windows.  At some point the focus fails to switch.  When this happens, 
press Alt and the focus switches.

Ken

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