> Then please post the results requested in
> https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1649566/comments/21
> so it may be reviewed.

Comment 21:
>> If still reproducible, please post results following:

>> https://wiki.ubuntu.com/DebuggingKernelBoot
This is not applicable as booting is successful

>> https://wiki.ubuntu.com/DebuggingSystemCrash
I reproduced the crash and tried "Alt+SysRq+1" followed by "Alt+SysRq+t".
As the display was frozen with the blue-white pattern I did not see a 
traceback. After reboot,
I found in "kern.log":

Feb  5 19:05:10 localhost kernel: [ 4756.501608] nouveau 0000:00:0d.0: bus: 
MMIO write of 01b20001 FAULT at 00b020
Feb  5 19:05:11 localhost kernel: [ 4758.190584] nouveau 0000:00:0d.0: bus: 
MMIO write of 00000000 FAULT at 00b020
  5 19:07:22 localhost kernel: [    0.000000] Initializing cgroup subsys cpuset

I see many further "MMIO write of XXXX FAULT at 00b0[12]0" in "kern.log"
(I will attach the extract of "nouveau" messages from "kern.log").

Obiously, the kernel is in a very bad state. Do you see a good chance
that a crash kernel would get activated in the situation above?

> Did you checksum the ISO you downloaded?

> If so and it passed, you can make an ISO of what you burned and checksum this 
> to confirm it burned correctly via a terminal:
> sudo dd if=/dev/sdX of=file.iso

Surprisingly "sudo dd if=/dev/sr0 of=file.iso" ("sr0" corresponds to my DVD 
resulted in a much larger "file.iso" than the original Ubuntu ISO file (I 
aborted the copy after "file.iso" grew up to about 2.7 GB (the Ubuntu ISO is 
about 1.5 GB)).
When I mount the burned ISO file, the "properties" menu and "du -s" tell me the 
correct size (thus, the "dd" copy may do something wrong).

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  [GeForce 7025 / nForce 630a] System freeze

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