Public bug reported:
After a recent update, the "Prime Profiles" option disappeared from Nvidia
Settings. I'm not sure if this is a bug in Nvidia-Settings or something else
though... because prime-select doesn't work either:
$ sudo prime-select intel
Error: alternatives are not set up properly
E
I've managed to fix this by blacklisting nouveau:
$ cat /etc/modprobe.d/blacklist-nouveau.conf
blacklist nouveau
blacklist lbm-nouveau
alias nouveau off
alias lbm-nouveau off
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Public bug reported:
I'm using Ubuntu 14.04 Trusty Tahr 64 bit and my laptop (Dell XPS L702x
using Nvidia Optimus) can't boot starting with kernel 3.13 (I've tried
all three updates: 3.13.0-1-generic, 3.13.0-2-generic and
3.13.0-3-generic). When booting, I get this error: "BUG: soft lockup -
CPU#
Hello,
The last working kernel was 3.12.0-8-generic and the first for which the
bug started was 3.13.0-1-generic. I'll also try what you said and post
the results.
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I've tried the kernels you mentioned and:
- v3.12 final worked
- v3.13-rc3 didn't work
The problem is that the bug behavior changed after a couple of reboots.
I was trying to take a photo of the error messages but I couldn't get a
clear photo and after a few reboots, the error wasn't displayed an
** Attachment added: "error photo 2"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1269404/+attachment/3950837/+files/2014-01-17%2013.25.59.jpg
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** Attachment added: "error photo 1"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1269404/+attachment/3950836/+files/2014-01-17%2013.23.05.jpg
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Both v3.13-rc2 and v3.13-rc1 didn't work. This time I was able to make
photos of the errors. I've attached 2 photos to the bug report...
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https://bugs.launchpad.net/bugs/12694
Thanks!
Unfortunately v3.13-rc8 doesn't work either...
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Title:
BUG: soft lockup - CPU#2 stuck for 22s! [systemd-udevd:546]
Status
I found out what was causing it: starting with v3.13-rc1, having
"threadirqs" under "GRUB_CMDLINE_LINUX_DEFAULT" in the /etc/default/grub
configuration file causes the behaviour I mentioned above.
After removing "threadirqs" from /etc/default/grub, the bug doesn't
occur any more. I guess this is s
The packages you provided do not install successfully. Here's the output
(I've tried a couple of time and the result was the same):
sudo dpkg -i *.deb
(Reading database ... 721241 files and directories currently installed.)
Preparing to unpack
linux-headers-3.12.0-031200-generic_3.12.0-031200.201
Yes, it was installed successfully. But unfortunately it doesn't work.
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Title:
BUG: soft lockup - CPU#2 stuck for 22s! [systemd-udev
Yes, I meant that the bug is still present with this kernel.
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Title:
BUG: soft lockup - CPU#2 stuck for 22s! [systemd-udevd:546]
St
Unfortunately the bug still occurs with the kernel from your latest
comment.
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Title:
BUG: soft lockup - CPU#2 stuck for 22s! [system
Unfortunately the laptop froze with this kernel too, so the bug still
occurs.
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Title:
BUG: soft lockup - CPU#2 stuck for 22s! [syste
This kernel worked, the bug didn't occur.
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Title:
BUG: soft lockup - CPU#2 stuck for 22s! [systemd-udevd:546]
Status in “linux” pac
Well, I spoke too soon.
With this kernel, the laptop doesn't freeze on boot. But the laptop
freezes when I click the restart button under Unity, it happened every
time. It doesn't occur with the "sudo reboot" command though.
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I investigated further and something is really messed up with this last
kernel. Every time I switch to a tty, the laptop freezes and the tty
displays a huge list of error messages. And this happens even without
"threadirqs". I'm attaching photos of the errors.
** Attachment added: "pictures - ker
I forgot something: those errors occur when switching to a tty AFTER
logging in to Unity. If I get to the login screen and then I switch to a
tty, the laptop doesn't freeze when switching to the tty and no errors
are displayed in the tty. Maybe that's somehow relevant.
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No, I didn't see any "soft lockup" messages.
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Title:
BUG: soft lockup - CPU#2 stuck for 22s! [systemd-udevd:546]
Status in “linux”
The bug still occurs, this one freezes too.
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Title:
BUG: soft lockup - CPU#2 stuck for 22s! [systemd-udevd:546]
Status in “linux” p
Like the others, this one freezes too when using "threadirqs". So the
bug still occurs.
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Title:
BUG: soft lockup - CPU#2 stuck for 2
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