lock-out due to lattice

[Dave Love]

Binary package hint: rss-glx

I was locked out of the console and by ssh'ing in found that the problem was due to
lattice apparently having gone wild. The keyboard was unresponsive -- key presses wouldn't
wake up the display. After killing the process, the display wouldn't update properly -- areas
of the desktop didn't get re-drawn -- and I had to stop the session.

This is in up-to-date feisty (rss-glx 0.8.1-3ubuntu3).

[Kagetsuki (zero-tsuki)]

Exact same thing with NVidia GLX on Intrepid. Other GL screensavers seem to do the same thing. Have not tested non-GL screensavers.

[Anonio Fiol (antonio-fiol-es)]

Similar symptoms on Intel GM965/GL960 on a Lenovo T61 Thinkpad.
Busyspheres screensaver (and others) work well, but when I press a key, screen freezes, keyboard unresponsive.
SSH-ing into the machine, busyspheres was taking 100% CPU, and not responding to "kill". After "kill -9", however, the unlock password prompt appeared correctly.

[Gaetan Nadon (memsize)]

In order to provide a complete bug report to development, could any/all of you provide the following information:

Output of "lspci -nn | grep VGA"
Output of "cat /etc/X11/xorg.conf | grep -A 2 'Section "Device"'"
Is the problem intermittent or does it happen all the time?
The version of Ubuntu "uname -a"
The version of rss-glx "aptitude show rss-glx"

I assume the steps to reproduce would be:
1- Lock the screen to run a screensaver, for example "lattice"
2- Attempt to wake-up the desktop with keyboard or mouse
3- The desktop is unresponsive, the password prompt dialog never shows up
4- From a remote computer, logging using ssh reveals high CPU usage and
killing screensaver process may or may not restore the desktop to normal

For my part, I have attempted to reproduce without success. This is understandable if the problem is sensitive to video hardware or driver. These are my computer spec:

01:05.0 VGA compatible controller [0300]: ATI Technologies Inc RS690 [Radeon X1200 Series] [1002:791e]
Section "Device"
 Identifier "Generic Video Card"
 Driver "fglrx"
Linux ubuntu 2.6.24-23-generic #1 SMP Mon Jan 26 01:04:16 UTC 2009 x86_64 GNU/Linux
Architecture: amd64
Version: 0.8.1-8ubuntu4

BugSquad

[fastpakr (cjohnsonnucc)]

My 9.04 32 bit system locks up in gdm when attempting to preview Lattice. Tried killing PID for Lattice via SSH with no success. Now that it's selected, any time the screen saver goes active, video signal ends instantly (monitor actually goes idle).

"lspci -nn | grep VGA"
01:00.0 VGA compatible controller [0300]: ATI Technologies Inc RV516 [Radeon X1300/X1550 Series] [1002:7187]

"cat /etc/X11/xorg.conf | grep -A 2 'Section "Device"'"
Section "Device"
 Identifier "Configured Video Device"
EndSection

The problem does not appear to be intermittent.

"uname -a"
Linux SC-UBU-1000 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:57:59 UTC 2009 i686 GNU/Linux

rss-glx Version: 0.8.2-1ubuntu3

Hope this helps.

[Gaetan Nadon (memsize)]

Thanks for reporting this bug and supporting information. Since this bug has enough information provided for a developer to begin work, I'm going to mark it as confirmed and let them handle it from here. Thanks for taking the time to make Ubuntu better!
BugSquad