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[eyeshavings <706783@xxxxxxxxxxxxxxxxxx>]

Athlon XP on biostar mobo with 1GB RAM running every thing before 9.04
with no problem - absolutely shut down since 10.04 to 31 January 2011.

As it so happened...
changed Monitor Preferences resolution
   from 1920 x 1080 (16:9) 1.7 ratio
   to 1680 x 1050 (16:10) 1.6 ratio
   screen measures 20 x 11.25 (16:9) 1.7 ratio
   Probably will not change anything but it was easy and worth a shot.

the spell-checking feature annoyed me.  Cleared option in Preferences
and Tomboy 1.4.2 unceremoniously blinked off.  I officially caught a
lucky break.  Discovered fix while absolutely furious and no destruction
occured.

Shut down, stopped into BIOS since I noticed references to RAM and BIOS
settings in many explanations regarding openchrome and this bug.

Planned:
:/: Reboot and determine function
:/: toggle VGA SHARE MEMORY SIZE settings to verify root cause of MALF.
:/: toggle VIDEO RAM CACHEABLE settings to verify root cause of MALF.

BIOS CHANGE LOG (Bottom line)
State A Verify w/monitor res 16:10
State 1 VGA SHARE 64M	RAM CACHE ON	PASS
State 2 VGA SHARE 32M	RAM CACHE ON	FAIL
State 3 VGA SHARE 64M	RAM CACHE OFF	PASS
State 4 VGA SHARE 32M	RAM CACHE OFF	FAIL

State B Verify w/monitor res 16:9
State 1 VGA SHARE 64M	RAM CACHE ON	PASS
State 2 VGA SHARE 32M	RAM CACHE ON	FAIL
State 3 VGA SHARE 64M	RAM CACHE OFF	PASS
State 4 VGA SHARE 32M	RAM CACHE OFF	FAIL

CONCLUSION:
BIOS SETTING>ADVANCED SHIPSET FEATURE>AGP & P2P BRIDGE PROTOCOL>VGA SHARE MEMORY SIZE appears to be the single point failure starting with 10.04 onward.  As a courtesy - I point out that should one for some reason select VGA SHARE MEMORY SIZE [Disabled] it may well appear that the mobo is fried, or there is an issue with either the video card (some more) or monitor.  Likely there are normal beeps, but display shuts down without so much as a BIOS screen.  Navigating BIOS blind has about a 2% chance of success.  One may clear BIOS with a jumper in most cases, but one will still have to go through BIOS and put all things back in place.

BIOS SETTING>CPU & BUS CONTROL setting VIDEO RAM CACHEABLE [Enabled or
Disabled] setting does not impact login loop issue.

Ubuntu 10.04, 10.10 & 11.04 (somehow got updated while I was sleeping)
Monitor Preference Setting for Screen Resolution did not impact login
loop issue for the two states tested (16:10 and 16:9).

eyeshavings RECOMMENDATION: set bios VGA SHARE MEMORY SIZE to 64M or
max.

Thank you to every one that said something, I needed Every Bit of the input I got.  I hope this is useful to the next update.  Apologies for going on so much.  Thanks again.
==============

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https://bugs.launchpad.net/bugs/706783

Title:
  [KM400] Xorg crash on Ubuntu 10.10