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Old 10-04-2012, 08:37 AM   #1
Chris.Bristol
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Kubuntu kernel bug?


I changed from Ubuntu to Kubuntu three days ago and since then the screen has locked up twice. On both occasions what I think is a log file appeared on the screen. Nothing I tried would unlock the screen.

A line with
Quote:
-----cut here-----
appears near the top followed by:

Quote:
kernel BUG at /build/buildd/linux-3.2.0/drivers/gpu/dsm/ttm/ttm_bo.c:1648!
Followed by 20ish more lines.
 
Old 10-07-2012, 11:02 AM   #2
tommcd
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Quote:
Originally Posted by Chris.Bristol View Post
I changed from Ubuntu to Kubuntu three days ago and since then the screen has locked up twice. ...
How did you make this change???
1. Did you do a clean install of Kubuntu??
2. Did you simply just run: sudo apt-get install kubuntu-desktop???
3. Or did you do something else to change to Kubuntu??? We need the specifics here.
Quote:
Originally Posted by Chris.Bristol View Post
On both occasions what I think is a log file appeared on the screen. Nothing I tried would unlock the screen. ...
On both occasions of what??? Are you talking about when you try to boot into Kubuntu??? Or something else???

Please tell us:

1. Exactly how did you switch from Ubuntu to Kubuntu?
2. What exactly happens when you boot? Do you get a choice to boot to Ubuntu or Kubuntu??
Please tell us exactly what happens when you boot the K/Ubuntu system.

Also, are you using any third party repositories on your system, including those PPA repositories???

For reference, see this for how to install KDE on Ubuntu:
http://psychocats.net/ubuntu/kde
And should you wish to purge all traces of Ubuntu and just go with a pure Kubuntu system, see this:
http://psychocats.net/ubuntu/purekubuntu

Note that for the best results, a clean install of Kubuntu would give you a pristine Kubuntu system without any of the left over detritus from a Ubuntu install that added Kubuntu and then attempted to purge Ubuntu from your new Kubuntu system.

Last edited by tommcd; 10-07-2012 at 11:17 AM.
 
Old 10-07-2012, 12:23 PM   #3
Chris.Bristol
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Kubuntu kernel bug?

Quote:
Originally Posted by tommcd View Post
How did you make this change???
1. Did you do a clean install of Kubuntu??
Yes, I formatted the "/" partition but kept the "/home" partition.

Quote:
On both occasions of what???
Of the crash.

Quote:
Please tell us exactly what happens when you boot the K/Ubuntu system.
Normal startup, login gives me these four options:
Default
KDE Plasma
KDE Plasma (failsafe)
Failsafe


Quote:
Also, are you using any third party repositories on your system, including those PPA repositories???
No.

Last edited by Chris.Bristol; 10-07-2012 at 12:37 PM.
 
Old 10-16-2012, 05:32 PM   #4
JaseP
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Upgrade your system to linux-image-3.2.0-32-generic (3.2.0-32.51). This is a known issue and should be fixed as of 10/15/2012.
 
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Old 10-16-2012, 06:16 PM   #5
Chris.Bristol
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Quote:
Originally Posted by JaseP View Post
Upgrade your system to linux-image-3.2.0-32-generic (3.2.0-32.51).
Thanks - I've no idea how to do this, but I intend to upgrade to Ubuntu 12.10 tomorrow when it comes out. The first Beta had a later Linux image than you mention, so I imagine that the stable release should be OK.

Quote:
Quantal Beta-2 includes the 3.5.0-15.23 Ubuntu Linux kernel which was based on the v3.5.4 upstream Linux kernel.
I have been using Kubuntu as I prefer the KDE Desktop Manager to Unity, but I prefer the programs and utilities that come with Ubuntu, so I am going to try installing Ubuntu then changing to the KDE Plasma desktop. With my limited understanding of Window Managers and Desktop Managers (I'm still not sure of where one stops and the other starts) that should be entertaining!

Last edited by Chris.Bristol; 10-16-2012 at 06:26 PM.
 
Old 10-17-2012, 01:37 PM   #6
JaseP
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From a terminal;

sudo apt-get update

Followed by;
sudo apt-get upgrade

Don't want to change your mind or anything,... but 12.04 is a Long Term Support (LTS) release (3+ years). Ver. 12.10 will not be (18 mos., I think)... There is a certain level of pain when upgrading, no matter how well they've done their bug-hunt.

Just FYI...
 
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Old 10-17-2012, 05:29 PM   #7
Chris.Bristol
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JaseP
I didn't realise that I could upgrade to the latest kernel that easily! I did update and then upgrade - nothing happened, but I always accept the latest automatic updates so maybe I've already got it. I haven't had the problem recently either.

Thanks for the very sensible warning. I'm not too bothered about the LTS and I know from past experience that when I upgrade to 12.10 I'm likely to have a few hiccups. If it all goes pear-shaped I shall either just go back to 12.04 or swap to another distribution. I've had to do that a few times now! I stuck with Ubuntu for quite a while as it was reliable and it suited me perfectly, then along came Unity, sigh......
 
Old 11-03-2012, 10:06 AM   #8
Chris.Bristol
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I've upgraded to Ubuntu 12.10 plus Gnome Classic, it's reliable and is more to my taste.
 
Old 11-04-2012, 08:40 AM   #9
tommcd
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Quote:
Originally Posted by Chris.Bristol View Post
I've upgraded to Ubuntu 12.10 plus Gnome Classic, it's reliable and is more to my taste.
You are not the only one.
Ubuntu 12.10 with Unity got a rather poor review on distrowatch.com this week:
http://distrowatch.com/weekly.php?is...121029#feature
Not surprisingly, Ubuntu 12.10 with Unity is reported there to be significantly slower, than the same setup on 12.04. Using Ubuntu 12.10 with Gnome Fallback improved things for the reviewer.

Meanwhile, I am happy to report that Lubuntu 12.10 with the LXDE desktop is just as light and snappy as it has always been!
 
Old 11-04-2012, 10:47 AM   #10
Chris.Bristol
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Quote:
Originally Posted by tommcd View Post
You are not the only one
Actually I meant ...more to my taste than Kubuntu. With Unity it isn't a matter of taste, it is completely unusable (IMHO).

Quote:
Meanwhile, I am happy to report that Lubuntu 12.10 with the LXDE desktop is just as light and snappy as it has always been!
Haha! I already have Lubuntu on my old laptop, but I will take your hint and upgrade it - provided doing so doesn't **** up the wireless access that took quite a while to get working...
 
  


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