Hi,

I have some new info.

Going through Xorg.0.log I saw this entries:

...
(II) intel(0): EDID vendor "SEC", prod id 22615
(II) intel(0): Printing DDC gathered Modelines:
(II) intel(0): Modeline "1440x900"x0.0   96.31  1440 1504 1536 1760  900 903 
906 912 -hsync -vsync (54.7 kHz)
(II) intel(0): EDID vendor "SEC", prod id 22615
(EE) intel(0): Mode 1280x1024 does not fit virtual size 2720x900 - internal 
error
(II) intel(0): EDID vendor "SEC", prod id 22615
(II) intel(0): Printing DDC gathered Modelines:
(II) intel(0): Modeline "1440x900"x0.0   96.31  1440 1504 1536 1760  900 903 
906 912 -hsync -vsync (54.7 kHz)
(II) intel(0): EDID vendor "SEC", prod id 22615
(EE) intel(0): Mode 1280x1024 does not fit virtual size 2720x900 - internal 
error
(II) intel(0): EDID vendor "SEC", prod id 22615
(II) intel(0): Printing DDC gathered Modelines:
(II) intel(0): Modeline "1440x900"x0.0   96.31  1440 1504 1536 1760  900 903 
906 912 -hsync -vsync (54.7 kHz)
(II) intel(0): EDID vendor "SEC", prod id 22615
(EE) intel(0): Mode 1280x1024 does not fit virtual size 2720x900 - internal 
error
...

It caught my attention that the error message made reference to the virtual 
screen size, so I checked that this was the size set on my xorg.conf (correct) 
and went to Screen Resolution to see what was happening.
In Screen Res there was my laptop screen (Inspiron 9400 17") AND another screen 
(I don't have any other monitor connected to my laptop right now).
Thinking that it might be some stored configuration from the last time I hooked 
the laptop to my TV, I checked with Xrandr and, to my surprise, the output said 
that my TV output was connected - which wasn't. Even more, I've always used my 
DVI output, not my TV output.

In an attempt to avoid the error seen in Xorg.0.log I moved this TV screen to 
be below the laptop screen (and increase the vertical resolution). The first 
time I did it without activating the second screen (it was always "Off" in 
Screen Resolution) and nothing changed.
The second time I activated the TV screen, placed it under the laptop's, saved 
(with a dialog telling me it was going to change my virtual screen size in 
xorg.conf) closed everything and suspended the laptop.

After resume, the loging screen came up without a glitch   :-D

I thought that the change in virtual screen size had made the trick, but
in fact what has happened is that the second screen is no longer
recognized as "connected" by Xrandr and hence doesn't show up on Screen
Resolution.

Even though I'm happy that things are back to normal, there are a couple
of questions that still remain a mystery for me:

1) Why was the TV output showing up as "connected" even though it wasn't (and 
has never been)? Even through several reboots!
2) Why was the driver (?) trying to fit 1280x1024 in my virtual screen? If it 
had anything to do with the "ghost" TV screen it would be even more weird, as 
the maximum resolution for the TV output shown in Xrandr was much lower than 
that.

Thank you again for your help.

Regards,
Alfonso

-- 
945GM blank screen after resume, Ctrl-Alt-F1 gets to login
https://bugs.launchpad.net/bugs/300672
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