Ubuntu 12.04 beta1: screen remains blank after screen saver (nvidia)

[devvv]

Ubuntu 12.04 beta1

Steps to reproduce:
* Install nvidia driver as recommended
* Go somewhere and wait a few minutes
* Return to PC, screen is black
* Move mouse

Expected result:
* Unlock screen

Actual result:
* Black screen, only mouse cursor visible

Additional info: Bug is present for years and has apparently never been fixed
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: devvv 1777 F.... pulseaudio
 /dev/snd/controlC0: devvv 1777 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfa100000 irq 46'
   Mixer name : 'Realtek ALC889A'
   Components : 'HDA:10ec0885,1458a002,00100101'
   Controls : 49
   Simple ctrls : 23
Card1.Amixer.info:
 Card hw:1 'NVidia'/'HDA NVidia at 0xf7000000 irq 17'
   Mixer name : 'Nvidia GPU 10 HDMI/DP'
   Components : 'HDA:10de0010,10de0101,00100100'
   Controls : 24
   Simple ctrls : 4
DistroRelease: Ubuntu 12.04
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.
MachineType: Gigabyte Technology Co., Ltd. P35-DS4
NonfreeKernelModules: nvidia
Package: linux (not installed)
ProcEnviron:
 LANGUAGE=de_AT:de
 TERM=xterm
 LANG=de_AT.UTF-8
 SHELL=/bin/bash
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-18-generic root=UUID=592a5e07-5c7b-40b7-9609-a6badaae242b ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-18-generic N/A
 linux-backports-modules-3.2.0-18-generic N/A
 linux-firmware 1.71
RfKill:

Tags: precise
Uname: Linux 3.2.0-18-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 06/19/2009
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F14
dmi.board.name: P35-DS4
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF14:bd06/19/2009:svnGigabyteTechnologyCo.,Ltd.:pnP35-DS4:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnP35-DS4:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: P35-DS4
dmi.sys.vendor: Gigabyte Technology Co., Ltd.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/948180/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Fabio Marconi (fabiomarconi)]

Hello
Can you please reproduce the bug and attach here, using the button below 'Add attachment or patch' the file
/var/log/kern.log
/var/log/Xorg.0.log.old
/var/log/syslog
one at time then run in terminal
apport-collect 948180
---
Ubuntu Bug Squad volunteer triager
http://wiki.ubuntu.com/BugSquad

[devvv (devvv)]

Seems to be a crash in gnome-screensaver.

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[devvv (devvv)]

Hello, I have reproduced the bug and attached the requested files. I think it's a problem in gnome-screensaver because of the last kern.log line:

Mar 12 23:56:54 gaga kernel: [38061.034879] gnome-screensav[1997]: segfault at 30 ip 00007f7651c163e7 sp 00007fffc9b390b0 error 4 in libgtk-3.so.0.318.0[7f76519ec000+4bf000]

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Vanessa Dannenberg (vanessadannenberg)]

This bug is still present in the release of Precise, and it not limited to nVidia cards (I have an ATI Radeon HD6870 using the binary driver). Exact same symptoms as the original reporter: computer is still alive and running, but all I havbe when this triggers is a black screen and a movable mouse cursor. I have to ctrl-alt-F1 and reboot to recover (restarting X isn't enough). I run XFCE and xscreensaver, not gnome, so clearly the problem is somewhere lower-level.

I find this happens mostly when I come back from suspend, but not always - sometimes it happens if I just leave the computer idle and in the screensaver for long enough.

[Fabio Marconi (fabiomarconi)]

while your symptoms sound similar, you're likely experiencing an unrelated issue. Please file a new bug for it using the command 'ubuntu-bug linux' (and a photo if any corruption is seen).

[Tarus Balog (tarus)]

Just a note to Vanessa - I have this same problem on precise with ATI - if I leave the machine for a day or so when I come back I get the blank screen with just a mouse cursor issue.

Today I found that if you just wait - on the order of 4-5 minutes - the login prompt will eventually show up. Running top I found that chromium was taking up a lot of CPU, so I restarted it, but I'm not sure if that is related.

In any case, there is obviously something going on here but next time it happens wait and see if it eventually does present you with a password or a desktop screen.