Re: Monitor disconnects (?) in F13

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On Mon, Jun 7, 2010 at 1:31 PM, Patrick O'Callaghan <pocallaghan@xxxxxxxxx> wrote:
On Mon, 2010-06-07 at 12:15 -0400, Gregory Woodbury wrote:
>
>
> On Fri, Jun 4, 2010 at 10:33 PM, Patrick O'Callaghan
> <pocallaghan@xxxxxxxxx> wrote:
>
>         On Sun, 2010-05-30 at 22:05 -0400, Sam Varshavchik wrote:
>         > Patrick O'Callaghan writes:
>         >
>         > > The only recourse seems to be a hard reset as there's no
>         reaction to the
>         > > keyboard or mouse. I haven't yet tried ssh from another
>         machine to poke
>         > > around. If anyone tells me what to look for I'll be happy
>         to do it next
>         > > time.
>         >
>         > Try the ssh. This sounds like a kernel crash.
>
>
>         It happened again so I tried the ssh. I was able to log in and
>         everything seemed to be still running, including my usual GUI
>         apps (I
>         use KDE). Killing kdm, killing X and doing 'init 3' all had no
>         effect.
>         It's as if the monitor is physically disconnected (or the
>         video driver
>         is dead). I had to reboot. I'm going to report it to BZ.
>
> I'm having similar problems, what is the Bugzilla number?

I've been waiting for it to happen again so I can back up my report with
actual data, including /var/log/messages, /var/log/Xorg.*, dmesg output,
lsmod output etc. However the bug doesn't want to collaborate and is now
in hiding. I've turned off power-saving and the screen-saver, and it
hasn't happened again, which may be a clue in itself, but if you can
provide the above data, create the BZ entry and report it here so others
can add comments.

poc

It's not a kernel crash, It's an X server crash/hang. It depends on an interaction between gnoe-screensaver modules, the gnome-power manager and the X server.  The workaround is to select a screensaver module that doesn't crash/hang and leave it alone.

I have not exhaustively tested all the screensaver modules but have found two that definitely elicit the bad behaviours on my x86_64 box. (I've not had the problem on i686 boxes.)

"Ant Inspect" will crash the X server, showing a gdm-greeter when waking up the monitor.
"Apple II" will hang the X server, requiring a ssh into the box and a manual kill -9 of the X server to recover without a reboot.

I have filed a bugzilla report (BZ #606136) and invite y'all to add comments thereunto.

--
G.Wolfe Woodbury
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