System hang when switching configurations

Bug #926037 reported by Tessa Lau on 2012-02-03
16
This bug affects 3 people
Affects Status Importance Assigned to Milestone
disper
Undecided
Unassigned

Bug Description

I use disper to toggle between a 2-head setup (docked laptop + external monitor) and a laptop-only setup (undocked). I created a script that I can call just prior to undocking, which invokes disper with the laptop-only configuration. Sometimes when I run this script, the system hangs with a black screen. The external monitor turns off, but the laptop display goes black with the backlight still on. I don't see a mouse cursor, and no keypresses have any effect. I can't press Ctrl-Alt-Fn to get to a terminal. At this point my only option is to power-cycle the machine.

What can I do to help debug this problem?

Here is my disper.conf, which I invoke with "disper -i < ~tlau/dock/disper-undocked.conf":
backend: nvidia
associated displays: DFP-0
metamode: DFP-0: nvidia-auto-select @1440x900 +0+0
scaling: stretched
xinerama info order: DFP-0

Here are the log messages from the Xorg.0.log around the time of the crash:
[ 39066.373] (II) NVIDIA(0): Setting mode "DFP-0:nvidia-auto-select@1440x900+0+0"
[ 39084.071] (WW) NVIDIA(0): WAIT (2, 6, 0x8000, 0x00007ba8, 0x00007bb8)
[ 39091.071] (WW) NVIDIA(0): WAIT (1, 6, 0x8000, 0x00007ba8, 0x00007bb8)
[ 39094.072] (WW) NVIDIA(0): WAIT (2, 6, 0x8000, 0x00007ba8, 0x00007bc8)
[ 39101.072] (WW) NVIDIA(0): WAIT (1, 6, 0x8000, 0x00007ba8, 0x00007bc8)
(and more of the same)

I have disper version 0.3.0. I'll attach the nvidia-bug-report output below. Is there any other information I can provide to help identify this bug? It's very annoying that undocking my laptop and switching display configurations carries the risk of losing all my work.

Thanks!

Tessa Lau (tlau) wrote :
bpedman (bpedman) wrote :

I am having the same problem. I am using the nvidia drivers from the nvidia site directly (rather than the packaged drivers) and have a nvs 4200m...wish I had more helpful information

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