Ubuntu
gdm package

random garbage on TTY1

Bug #535316 reported by Noel J. Bergman
24
This bug affects 4 people
Affects Status Importance Assigned to Milestone
gdm (Ubuntu)
Invalid
Undecided
Unassigned
plymouth (Ubuntu)
Triaged
High
Unassigned

Bug Description

Binary package hint: gdm

See attached image of random garbage being put on TTY1. This is a new phenomena, after the recent updates.

ProblemType: Bug
Architecture: amd64
Date: Tue Mar 9 15:00:12 2010
DistroRelease: Ubuntu 10.04
InstallationMedia: Error: [Errno 13] Permission denied: '/var/log/installer/media-info'
NonfreeKernelModules: nvidia
Package: gdm 2.29.92-0ubuntu1
ProcEnviron:
 LANG=C
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-16.24-generic
SourcePackage: gdm
Uname: Linux 2.6.32-16-generic x86_64

Revision history for this message
Noel J. Bergman (noeljb) wrote :
Revision history for this message
Noel J. Bergman (noeljb) wrote :

Actually, it may have been happening earlier, too.

Revision history for this message
Noel J. Bergman (noeljb) wrote :

This appears to be related to plymouth. Reverting plymouth to the last known working version,. 0.8.0~-7, clears up the garbage, but mountall depends on 0.8.0~-10ubuntu1.

Revision history for this message
Noel J. Bergman (noeljb) wrote :

I don't believe that this is gdm related at all.

Changed in gdm (Ubuntu):
status: New → Invalid
Revision history for this message
Noel J. Bergman (noeljb) wrote :

Fully upgraded Lucid with plymouth exhibits this problem, which goes away as soon as plymouth (not libplymouth2) is purged.

Revision history for this message
John S. Gruber (jsjgruber) wrote :

Thanks for your report, Noel.

I believe you are right about gdm. I think it's more probably about how/when gdm gets started. I also believe you are seeing scan codes that are being sent to X and that a getty/login session is also running on /dev/tty1 and is getting confused.
In LP: #532047 the confusion may be between X and the plymouth daemon. Are you seeing occasional crashes when pressing certain keys by any chance? If so that might relate to LP: #529230.

If I'm correct your photo may help track these problems down. If I'm wrong your report is even more helpful.

Revision history for this message
Steve Langasek (vorlon) wrote :

This is an understood bug in plymouth's VT handling that causes gdm to start X on the wrong VT and/or with the VT in an inconsistent state. The fix for this is expected to land tomorrow; please test once the new plymouth upload is available.

Changed in plymouth (Ubuntu):
importance: Undecided → High
status: New → Triaged
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