ubuntu-x-swat team mailing list archive

[Mats Ahlgren <768567@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

This worked before absolutely just fine in karmic koala, but now it is
crashing and bringing down the entire operating system. ctrl-alt-f1 and
ctrl-alt-bksp are not working, and a hard reboot is required.

___Steps to reproduce___

Add a custom symbol file and load it via xkbcomp.
The file which produces this behavior is attached and in /usr/share/X11/xkb/symbols/reachable

___Instructions for how to use xkb___

Run [xkbcomp -w 4 schema.txt $DISPLAY], where schema.txt contains the
output of [setxkbmap -print], but with '+reachable' added to the
xkb_symbols clause.

___Symptoms___

Holding down right-alt+i should normally produce the Up Arrow key, but
in this version of the operating system, the system will hard-freeze,
such that no keyboard or mouse input seems to arrive at the screen at
all. This may take a few keystrokes, or holding it down so it
autorepeats, to trigger the freeze. Otherwise the arrow key does not
seem to work (as it had before). This can also be replicated on any
window, but works reliably on chromium while holding down ctrl+(ralt+[)
and holding it down.

Furthermore, if you hit shift-alt-numlk to enable Mouse Keys, you will
be able to emulate the mouse buttons, via ralt+h,n,m. These used to work
just fine in karmic, but now whenever they are pressed, on keydown (I
think), the pointer jumps a large way across the screen. The amount
jumped is roughly described as follows: If the pointer is on the bottom-
right portion of the screen, the pointer jumps a few hundred pixels to
the left and slightly fewer (but still a few hundred pixels) upwards. If
the point is on the bottom-left portion of the screen, the pointer jumps
up and to the left a few hundred pixels, but a bit less than before, and
now more towards the direction of the top-left corner. If the pointer is
in the top-left corner of the screen, the pointer jumps much less than a
hundred pixels, in the direction of the top left corner. It's as if
every time any mouse button is pressed, the pointer leaps towards the
left side of the screen, and moves slightly towards the top-left corner
of the screen, each time jumping a smaller and smaller amount, such that
it never quite reaches there.

If none of these keys are pressed, the system seems otherwise fairly
stable (I am writing this bug right now with this custom setting, but if
I use any of these particular key combos, my system will hard-freeze and
I will lose my bug report...).

Additionally I mention the following for completeness: This is probably
unrelated to the fact that in karmic, every few hours when using this
setup, all keyboard input will become impossible. The mouse button will
still work, but every time one wishes to type a letter, one has to press
and hold a key; apparently, autorepeat is able to make the keys work,
but the first press does not input anything. Thus typing 'ctrl-S' would
take about 5 seconds, since you had to hold down ctrl so it would be
autorepeating, then hold down S so it would be autorepeating. This is
probably a separate issue from the one I am reporting now.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xserver-common 2:1.7.6-2ubuntu7.5
ProcVersionSignature: Ubuntu 2.6.32-31.61-generic 2.6.32.32+drm33.14
Uname: Linux 2.6.32-31-generic x86_64
NonfreeKernelModules: fglrx
Architecture: amd64
Date: Thu Apr 21 15:24:05 2011
EcryptfsInUse: Yes
InstallationMedia: Kubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/zsh
SourcePackage: xorg-server

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug lucid

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https://bugs.launchpad.net/bugs/768567

Title:
  x11 keyboard: xkb pointer emulation broken and hard freezing, 100%
  reproducible