[Bug 886496] [NEW] KDE Screenlock renders machine unusable since software-upgrade of Nov. 4th, 2011

[udippel]

Public bug reported:

Since my daily software update && upgrade of yesterday, every time the screen lock sets in, in does not get out of it again, except at a hard reboot.
The machine underneath is running happily, but neither keyboard nor mouse re-activate the screen. The Monitor LED indicates 'no signal', likewise to the state when the screen saver has been active for some time.

Reproducible: Always

Here is the tail end of 'ps ax' obtained through ssh when the system is 'stuck' with a blank, deactivated screen:
[...]
3223 ?        Sl     0:05 /usr/lib/chromium-browser/chromium-browser --type=renderer --lang=en-US --force-fieldtest=ConnCountImpact/conn_count_6/ConnnectBackupJobs/ConnectBackupJobsEnabled/DnsImpact/default_enabled_prefetch/DnsParallelism/parallel_default/GlobalSdch/global_enable_sdch/IdleSktToImpact/idle_timeout_10/Prefetch/ContentPrefetchPrerender1/ProxyConnectionImpact/proxy_connections_32/SpdyImpact/npn_with_spdy/SuggestHostPrefix/Www_Prefix/WarmSocketImpact/warm_socket/ --disable-client-side-phishing-detection --channel=2281.0x7fdee7c69700.374597154
 3974 ?        Sl     0:00 /usr/lib/kde4/libexec/kscreenlocker
 3979 ?        TN     0:00 kblankscrn.kss -root
 6538 ?        S<     0:00 [iprt]
 6539 ?        S      0:00 udevd --daemon
 6541 ?        S      0:00 udevd --daemon
 6682 ?        S      0:00 [kworker/1:0]
 6699 ?        S      0:05 [kworker/1:2]
 7042 ?        S      0:00 [kworker/0:1]
 7046 ?        S      0:00 [kworker/2:0]
 7055 ?        S      0:00 [kworker/u:0]
 7057 ?        S      0:00 [kworker/2:2]
 7058 ?        S      0:00 [kworker/u:2]
 7059 ?        S      0:00 [kworker/0:0]
 7061 ?        S      0:00 [kworker/2:1]
 7062 ?        S      0:00 [kworker/u:1]
 7063 ?        S      0:00 [kworker/0:2]
 7066 ?        Ss     0:00 sshd: udippel [priv]
 7277 ?        S      0:00 sshd: udippel at pts/2 
 7278 pts/2    Ss     0:00 -bash
 7333 pts/2    R+     0:00 ps ax
$

It is not possible to kill the kscreenlocker, only the kblankscrn.kss
-root can go. Then it looks like this:

3223 ?        Sl     0:06 /usr/lib/chromium-browser/chromium-browser --type=renderer --lang=en-US --force-fieldtest=ConnCountImpact/conn_count_6/ConnnectBackupJobs/ConnectBackupJobsEnabled/DnsImpact/default_enabled_prefetch/DnsParallelism/parallel_default/GlobalSdch/global_enable_sdch/IdleSktToImpact/idle_timeout_10/Prefetch/ContentPrefetchPrerender1/ProxyConnectionImpact/proxy_connections_32/SpdyImpact/npn_with_spdy/SuggestHostPrefix/Www_Prefix/WarmSocketImpact/warm_socket/ --disable-client-side-phishing-detection --channel=2281.0x7fdee7c69700.374597154
 3974 ?        Z      0:00 [kscreenlocker] <defunct>
 6538 ?        S<     0:00 [iprt]
 6539 ?        S      0:00 udevd --daemon
 6541 ?        S      0:00 udevd --daemon
 6682 ?        S      0:00 [kworker/1:0]
 6699 ?        S      0:05 [kworker/1:2]
 7042 ?        S      0:00 [kworker/0:1]
 7057 ?        S      0:00 [kworker/2:2]
 7062 ?        S      0:00 [kworker/u:1]
 7066 ?        Ss     0:00 sshd: udippel [priv]
 7277 ?        S      0:00 sshd: udippel at pts/2 
 7278 pts/2    Ss     0:00 -bash
 7339 ?        S      0:00 [kworker/2:0]
 7340 ?        S      0:00 [kworker/u:0]
 7343 ?        S      0:00 [kworker/0:0]
 7353 ?        S      0:00 [kworker/2:1]
 7374 ?        S      0:00 [kworker/u:2]
 7442 ?        S      0:00 [kworker/0:2]
 7444 pts/2    R+     0:00 ps ax

I cannot make out which update did this; in the last 24-48 hours? The
only major item that I remember was the fglrx update of the ATI-driver.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: kde-workspace-bin 4:4.7.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Sat Nov  5 18:39:57 2011
InstallationMedia: Kubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427)
ProcEnviron:
 LANGUAGE=
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: kde-workspace
UpgradeStatus: Upgraded to oneiric on 2011-10-14 (22 days ago)

** Affects: kde-workspace (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug oneiric

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https://bugs.launchpad.net/bugs/886496

Title:
  KDE Screenlock renders machine unusable since software-upgrade of Nov.
  4th, 2011

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