Bug#602095: black screen after reboot
 

tags 602095 + moreinfo
quit

Julien Cristau wrote:
> On Mon, Nov 1, 2010 at 17:20:49 +0000, Julien Tailleur wrote:

>> Everything went smoothly but after reboot I had a black screen and
>> nothing happening (shortly after grub).
[...]
>> At this time I had not installed the nvidia driver so I thought it
>> should not be this bug but I thought that maybe there was something
>> wrong with the nouveau driver. I thus blacklisted it and installed the
>> nvidia instead, and things work fine now.
>
> Please remove the nvidia driver, unblacklist nouveau, and attach the
> resulting dmesg.

Ping. nouveau and nvidia are different drivers, and each is likely to
have its own bugs. nouveau has the advantage that we might be able to
fix it.

Help in the form of information would be appreciated, though.

Thanks and sorry for the slow response,
Jonathan



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Bug#602095: black screen after reboot
 

Hi,

I'm not sure what I'm supposed to do with this message...

Results of preceding discussions:


Please remove the nvidia driver, unblacklist nouveau, and attach the
resulting dmesg.


I can't do that. If I unblacklist nouveau and remove the nvidia driver,
I just get a black screen right after grub and do not have access to dmesg.



Ping. nouveau and nvidia are different drivers, and each is likely to
have its own bugs. nouveau has the advantage that we might be able to
fix it.


I perfectly agree with that and would be happy to have a free driver
that works fine, whence my bug report.



Help in the form of information would be appreciated, though.


I'm happy to try and provide information but I was a bit lost about how
to provide this information. Since this is a professional computer which
I need to work on a daily basis, I could try to make a new partition,
install squeeze from scratch and get (hopefully) the same result.
However this result is just a black screen so there is not much
information I can give. I suppose I can always chroot into the partition
and access the log files, but you'll have to tell me which files would
help :-)



Thanks and sorry for the slow response,


No worries, sorry for the unhelpful answer :-)

Julien





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Bug#602095: black screen after reboot
 

Hey again,

Julien Tailleur wrote:

> I can't do that. If I unblacklist nouveau and remove the nvidia driver, I
> just get a black screen right after grub and do not have access to dmesg.

Ah, that makes sense.

When you get the black screen, is the machine still usable? E.g., can
you ssh into it, or can you run commands "blindly"? Does ctrl-alt-delete
work? Does the magic sysrq key work? Can you see text on the screen
if you use a bright flashlight to look at it?

Hopefully something like the following can work:

dmesg >log.before && modprobe nouveau && dmesg >log.after

It might also be possible to get the relevant information from
/var/log/dmesg or /var/log/dmesg.0 after rebooting.

Sorry for the slow response, and hope that helps.
Jonathan



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