Bug#233933: X server 4.3 stalls for a few seconds when switching from console back to X

[Raphael Zimmerer <killekulla@rdrz.de>]

On Fri, Feb 20, 2004 at 09:04:12PM +0100, Josip Rodin wrote:
> Package: xserver-xfree86
> Version: 4.3.0-0pre1v5

Here:  4.3.0-2
 
> The new (4.3) X server seems to have a nasty habit of stalling transitions
> from the console (640x400) to X (1024x768). Everything on the X display sits
> there for five or six seconds, at which point it resumes normally.

[snip]

> The problem disappears upon reverting to xserver-xfree86 4.2.1-16. That is,
> the pause after switching back from console reverts to being minute (adj.),
> probably as long as the time needed to actually re-render the screen.

Behaviour confirmed.
 
> There also seemed to be a similar longer pause when the X server would be
> started for the first time, but I can't say whether this is just a
> subjective observation. I also seem to recall seeing it on some of the other
> machines where I've installed X 4.3 from experimental, but I'm not sure.

Confirmed, too.

I tried to track down the problem. I found out that XFree86 spends
lots of time in ps2Reset() at /hw/xfree86/input/mouse/pnp.c.

My pointer-device was configured to take data from gpm:

Section "InputDevice" Identifier "Configured Mouse"
    Driver "mouse" 
    Option "CorePointer" 
    Option "Device" "/dev/gpmdata"
    Option "Protocol"        "PS/2"
    Option "Emulate3Buttons" "true"
    Option "ZAxisMapping"    "4 5" 
EndSection

After changing the device to "/dev/psaux" _and_ stopping gpm, the problem
went away.

My /etc/gpm.conf looks like that (with package version 1.19.6-12.1):
device=/dev/psaux
repeat_type=raw
type=ps2

Something in the communication between gpm and X goes wrong.

CC set do Maintainer of gpm.

Regards,
Raphael