Sorry, here is the link to the latest .xsession-errors --> http://pastebin.com/jMBGnuwB
After another event, I was again able to return to desktop by mousing to what would be a blank area of the desktop just on either side of the bottom panel. then right click and I have my desktop and open apps back! very strange.[UPDATE]
Don't know what other logs I can post, but maybe this helps. First, since this CAN happen before
login, it would seem some driver issue is possible if kdm is not called yet. Several of my /var/logs indicate "fbcon not found". Some threads say no problem, others indicate fbcon - i915 conflict as fbcon not loaded properly at boot. --> http://en.gentoo-wiki.com/wiki/Intel_GMA#Blackscreen
or --> http://www.digipedia.pl/usenet/thread/18802/2447/#post2438
or --> http://firstname.lastname@example.org/msg00622.html
There are numerous threads about i915 black screen issue with SEVERAL causes appearing/fixed/reappearing since 2009.
The only other relevant info I can provide is pclos 2010.12 kde which uses X11-xserver 1.6.5-x with no black screen issues on this laptop I can recall. Looking through my posts, it was after the X11-server-xorg upgrade (currently at 1.10.4-1 ) that these black screen issues seemed to come up.
I could stay with pclos 2010 if not for FF 3.5.x being outdated. I could live with FF 3.5.x if the rest of the world didn't change.
[UPDATE2] As of 04/19/12 am going to run pclos 2010.12 for a few days and see what gives. Will post back
[UPDATE 3] As of 04/26 Have tried several other distros with x11-server > 1.6.x and having similar blackscreen issues so currently running pclos 2010.12 with no "bump off" into black screen. Since there appears to be no way to upgrade 2010 and no way to rollback 2012, I may be "frozen" at 2010 which seems to be all that I need ( with latest versions of LO and FF installed successfully outside of repos). Unfortunately have not found a true solution. If I could rest assured that this was merely a display problem with pclos-2012 and that my files would remain bulletproof, I could feel more comfortable, but the current 2010 install will be stable enough as a backup machine alongside my desktop.
[UPDATE 4] As of 08/12/12 no bumps off into black screen with pclos 2010. This would seem to discount hardware issues that were suggested on another forum. I ran into this thread ( again on the Arch forums) -> https://bbs.archlinux.org/viewtopic.php?id=145187
about someone else with issues regarding X running on tty8 instead of tty7 as was happening on this Toshiba. Lots of stuff regarding policykit, kdmrc, /etc/inittab.
When running 2012.x I did ocassionally boot into KDE desktop with a " A monitor has been disconnected" warning. I don't know if this was related to the issue of X running on tty8 instead of tty7.
Have just decided to run this lappy as a general purpose unit and not for business. Too bad as it's got decent specs.[UPDATE 5]
As of Oct 1, 2012 all is fine on this laptop and it has been worked in as a backup business machine. Pretty sure the issue was a combination of funky hdwr and the xorg-server version issue. At this time have not found a way to easily run a newer pclos version with an old xorg-server so leaving it be.