System Crashes to Login Screen (haven been able to continually reproduce)

[Justin Bartos]

At random times doing various activities, Ubuntu will crash to the login screen. At first I read this may be related to FLASH video's, however this has since happened when running After Shot Pro (browsers closed) and Spotify

DMESG has errors around my SATA cable, but those shouldn't cause a crash to log in:
[477293.218954] ata5.00: status: { DRDY ERR }
[477293.218956] ata5.00: error: { ICRC ABRT }
[477293.218960] ata5: hard resetting link
[477293.218962] ata5: nv: skipping hardreset on occupied port
[477293.684032] ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[477293.700817] ata5.00: configured for UDMA/33
[477293.700827] ata5: EH complete
[477380.066259] ata5: EH in SWNCQ mode,QC:qc_active 0x1 sactive 0x1
[477380.066264] ata5: SWNCQ:qc_active 0x1 defer_bits 0x0 last_issue_tag 0x0
[477380.066265] dhfis 0x1 dmafis 0x1 sdbfis 0x0
[477380.066268] ata5: ATA_REG 0x41 ERR_REG 0x84
[477380.066270] ata5: tag : dhfis dmafis sdbfis sactive
[477380.066272] ata5: tag 0x0: 1 1 0 1
[477380.066282] ata5.00: exception Emask 0x1 SAct 0x1 SErr 0x300000 action 0x6 frozen
[477380.066284] ata5.00: Ata error. fis:0x21
[477380.066287] ata5: SError: { Dispar BadCRC }
[477380.066290] ata5.00: failed command: READ FPDMA QUEUED
[477380.066295] ata5.00: cmd 60/c0:00:a0:d4:34/00:00:38:00:00/40 tag 0 ncq 98304 in
[477380.066296] res 41/84:04:a0:d4:34/84:00:38:00:00/40 Emask 0x10 (ATA bus error)
[477380.066299] ata5.00: status: { DRDY ERR }
[477380.066301] ata5.00: error: { ICRC ABRT }
[477380.066305] ata5: hard resetting link
[477380.066307] ata5: nv: skipping hardreset on occupied port
[477380.532029] ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[477380.548714] ata5.00: configured for UDMA/33
[477380.548772] ata5: EH complete

When looking at my GDM logs I see:
(EE) NVIDIA(GPU-0): EVO Push buffer channel allocation failed
(EE) *** Aborting ***
(EE) NVIDIA(GPU-0): Failed to allocate EVO DMA push buffer
(EE) *** Aborting ***
(II) Unloading nvidia
(II) Unloading wfb
(II) Unloading fb
(EE) Screen(s) found, but none have a usable configuration.

Fatal server error:
no screens found

Please consult the The X.Org Foundation support
  at http://wiki.x.org
 for help.
Please also check the log file at "/var/log/Xorg.4.log" for additional information.

 ddxSigGiveUp: Closing log
Server terminated with error (1). Closing log file.

I don't see any errors in XOrg.0.log
pastebin of lightdrm.log:
http://paste.ubuntu.com/1261287/

I'm running the following:
Ubuntu 12.04LTS (up to date on patches)
Mythbuntu backend
8 GIG RAM (memtest ok)
2 SATA 1 TB WD Hard drives
NVIDIA Driver: 295.40
Chipset: Intel Core Duo 2.33Mhz
Motherboard: Asus P5N-E SLI
Video Card:Nvidia GeForce 8600GTS

[Justin Bartos (jbartos)]

Xorg log

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1062016/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]