I also get the complete system freeze, no mouse movement. Quite certain
this is not an video driver error.
I will try solution mentioned in #91, but is there a way to increase the
priority of this bug?
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For me (complete freeze) will be solved by the solution of #103
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Title:
ubuntu 12.04 64bit completely freezes frequently
To manage notifications
@ #110
okay, we have 2 bugs in 1 bug report :-)
1. Bug: Systems with Intel's Ivy Bridge and Sandy Bridge HD Graphics
completely freezes (keyboard and mouse are not responsive!)
Solution: #91
2. Bug: Systems with NVIDIA- or AMD/ATi- Graphics "only" the xsession
freezes (console access via CTRL+AL
About the kernel fix in #91, by looking at the names aren't those particular
ones targeted for AMD ? Per the "amd64.deb" in the name ?
I need to do something, this is getting ridiculous, it's not freezing right now
only cause I'm stuck in 2d, won't even start 3d :-/
Then I will still have the Nvi
@#108, I've tried to follow instructions in #99, that is adding
ppa:ubuntu-x-swat/x-updates. Only one package was updated :
xserver-xorg-video-intel. Still freezing.
I also tried to install fglrx that are proprietary drivers. Still freezing,
both with kernel 3.2.0.24 and kernel 3.3.6.
Now system
@ #108
"the #91 "linux 3.3.6 solution" is for Intel HD Graphics 2000, 2500, 3000 and
4000 (Ivy Bridge and Sandy Bridge )."
And for non Intel HD Graphics hard lock, any other idea ?
I have a Sandy Bridge (Core i7-720QM) with only a Geforce (GTS 250M),
and I have permanent freezes too. I haven't t
@ #106
you are affected by another bug.
your system is not affected by the "hard freeze" problem, because you can still
use your mouse and keyboard ;-)
let me guess, nvidia graphics? try #99
the #91 "linux 3.3.6 solution" is for Intel HD Graphics 2000, 2500,
3000 and 4000 (Ivy Bridge and Sand
Seeing same behavior on two machines.
One is a complete new reinstall to 12.04 (was 11.04 before) using PS/2 mouse
(through a PS/2 KVM)
The other system is an upgrade from 11.10, and is using a USB mouse.
Mouse simply freezes for 1-3 seconds once in a while (every 10-15 minutes on
first machine,
I've installed the 3.3.6 kernel, but still get the freeze as soon as I've been
logged in.
With keyboard, I can only do Ctrl+Alt+F2
With mouse, I can only move (no click)
I've switch to other linux distribution to be able to read my
emails/browse/etc...
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This affects me too. Complete lock up on 64bit since upgrading to 12.04.
Can't even SSH in remotely. Power cycle only option. Dell Precision
M4500, i7 quad core, Nvidia graphics. Have upgraded several other
(32bit) machines without any problems.
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@ #103
with linux 3.3.6 my system (Intel i5 3570K, Gigabyte Z77M-D3H) runs completely
stable.
I will for now stick with linux 3.3.6
The linux 3.2 series gives me bad memories :-)
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https:
@#91
@#93
If you need 3.2 kernel Ubuntu .deb files with those patches, they're
available here:
http://people.canonical.com/~ogasawara/eugeni/rc6/
For more info:
http://lists.freedesktop.org/archives/intel-
gfx/2012-February/015029.html
Testing them and 3.3 that Michael (starkpc) mentioned now.
Tried / tested kernel 3.3.6. Worked better, but I still get freezes. I'm
back to 11.10 on my laptop. 12.04 is still unusable even with kernel
3.3.6. I can still hang my system by playing a video with Totem and
scrolling through photos with Shotwell.
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Awaiting the Backport.
My Machine has just frozen at exactly : 19h46. (I was working on Firefox, while
Chromium open)
after rebooting here is the output of the System log file:
May 18 19:40:51 L502X dhclient: bound to 192.168.51.10 -- renewal in 128
seconds.
May 18 19:42:00 L502X kernel: [129
Installed kernel 3.3.6 as suggested and now my system seems more stable.
Until now no lock ups. For those who are still suffering from this bug,
please try this. Comment #91 is the way to do it. Oh yeah of course the
command 'dpkg' needs to be sudo dpkg.
The only thing Ubuntu 12.04 still does is a
@ #98
the nvidia driver from here:
ppa:ubuntu-x-swat/x-updates
should work.
or perhaps the newest stable kernel 3.3.6
Since DRM (Direct Rendering Manager) is in mainline, linux machines
freezes a lot more :-)
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We have 14 computers with the exact same config working perfect!
(Some with Windows XP, some with Ubuntu 10.04 / 11.04 or 11.10)
Two computers did have a complete fresh install of Ubuntu 12.04 LTS 64bit.
Since than complete Lockups about once or twice a day with the 12.04 systems.
Even ping or ssh
@#96
Thank you Michael ! I see...
I will install linux kernel 3.3.6
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Title:
ubuntu 12.04 64bit completely freezes frequently
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@ #95
you need linux 3.3.6 ;-)
howto: #91
"xserver-xorg-video-intel 2.19.0-0ubuntu1~xup1" from
"ppa:ubuntu-x-swat/x-updates" does not solve the hard freeze problem!
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@#88
Which PPA source do you use to install 2.19.0? Use ppa:glasen/intel-driver ?
This PPA xserver-xorg-video-intel 2.19.0~precise~ppa1 package description told:
This package provides the driver for the Intel i8xx and i9xx family of
chipsets, including i810, i815, i830, i845, i855, i865, i915, i9
@#93
I hope the kernel team backport the fixes in linux 3.3 to linux 3.2.
But in the meantime, I recommend using linux 3.3.6.
(ubuntu 12.04 uses all components from the "Intel 12.02 graphics package".)
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Same behavior on my system, hard freeze: no responsive mouse, no
responsive keyboard, no responses on pings sent by another machine to
the effected one. In some cases the machine crashed immediately after
login while building the dash. Unity 3D is unusable, Unity 2D work fine,
expect of Firefox (st
I've had the same problems with Ubuntu 12.04 as well as Kubuntu 12.04.
Screen would randomly freeze, particularly while watching a video.
Pointer completely unable to move, and if audio is playing, it skips
like a scratched record. At first I thought it might have been
instability with the newest
Very good news for Intel Ivy Bridge (i5-3570K, etc.) users!
It's a Kernel Bug (drm-intel).
Install Linux 3.3.6 and the system runs stable :-))
Link: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.3.6-precise/
Download this files in a folder:
linux-headers-3.3.6-030306-generic_3.3.6-030306.201
Note that nvidia-current was just upgraded to 295.53... that might
effect stability for some people.
I've been running with 295.49 for several days now on both my systems
and saw a marked improvement in stability - no load spikes, occasional
Firefox freezing but nothing serious. I suspect there a
Underclocking and over-cooling my 3570k led to a system (described about
in a "me too" post) which has been stable for many hours now.
Starting to worry that it might be a hardware issue in the GPU part of
the chip that's triggered by Unity3D.
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I had this problem - the hard freeze version. 3570k processor as well.
Installing version 2.19.0 of the intel video driver seems to have fixed
it.
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I hope they can get to work on it. I think 12.04 LTS is great but there
is no point in upgrading if a bug like this makes it unusable.
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Title:
ubu
interesting sentence on intels graphics website:
http://intellinuxgraphics.org/2012.02.html
Additionally, the following stability patches are currently available in
the drm-intel-fixes branch and should be available on the stable 3.2.x
kernel after this release:
Stability fixes for hard hangs on
I haven't found a bug report for this issue involving a 32-bit 12.04
installation, but otherwise I have the same problem as the rest of the
people here: complete/hard freeze with no mouse movement, tty console,
or ability to SSH into machine.
System configuration:
Intel Ivy Bridge i5 3570k 3.4 Gh
@ Michael (starkpc)
My apology Michael, I should have read the posts a little more carefully.
Additional to my post #80 I would like to add that I do have access to keyboard
so am able to peform REISUB. There looks like there may be the need for several
bug reports from the posts here. I do not
I recently installed newly released ubuntu 12.04 LTS 64 bit version on
my desktop. And it is frequently freezing (one or two time per hour)
during browsing (flash ?). Freeze is complete and CTRL + ALT + F1
doesn't work. Perhaps a kernel freeze ?
I am using on board graphics and do not have any gra
@ Geoff Smith (taurusone)
this is another, very similar bug, in your case "only" X (graphic environment)
freezes.
in other cases, the entire system freezes, no response from mouse or keyboard...
i have entire system freezes in KDE (kwin), Unity (Compiz), Gnome (Mutter).
unity-2d works fine... pr
I noticed that using Chrome/Chromium along simultaneously with Firefox triggers
the bug immediately or only 3 or 4 minutes later.
The Freeze occured frequently when I was interacting with Flash/HTML5 resources
in Chrome/Chromium.
I had this Freeze about 15 times now. COMPLETE FREEZE.
I doubt it'
I am also experiencing quite a few random freezes at startup and other
times. Using Gnome shell with fglrx driver NOT installed. Graphics card
AMD Radeon HD 5770. Cursor still functions but that is all. Clean
install of 12.04 64 bit.
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Total lock up here too. But happens sometimes during boot too ! I don't
even have the time to access login screen. So I went back to 11.10.
I have tried 12.04 with update from 11.10, clean install, live on CD and
USB key. Tried with Nouveau driver, with Nvidia driver. Tried Unity,
Gnome Shell, Uni
Please don't forget to press 'this bug affects me'. Bug heat is already
above 220, but still doesn't attract attention from developers and or
Cannonical
I also have tried Unity2D: on my machine Unity 2D freezes immediately
after the first mouse click!
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Same issue for this config :
Ivy bridge 3570k 3.4 GHz
Asus P8Z77-V
8 Go RAM Corsair vengeance.
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Title:
ubuntu 12.04 64bit completely freezes freq
I am also experiencing random complete freezes on a fresh install of
Ubuntu 12.04 LTS.
Ivy bridge 3570k 3.4 GHz
MSI Z77A-G45
16 GB DDR3-1600y
240 GB SanDisk Extreme SSD
2 TB Hitachi Hard Disk
Onboard HD4000 Graphics
Unity-3D, Unity-2D, Gnome-shell, and Gnome classic with effects all
randomly fre
I'm experiencing the same issue on Ubuntu 12.04 LTS, running Unity 3D and the
onboard Ivy Bridge GPU (Intel HD 4000).
Symptoms: Desktop freezes, no response from mouse or keyboard, can't change
TTY, Magic SysRq not working. Complete freeze.
Affected system:
Intel Core i7 3770K 3.5 GHz
Asus P8Z77
I also have an Intel Core i5 3570K on an ASUS P8H77-V motherboard and
have the same issue. Sometimes I can work for several hours before it
crashes, but often it hangs in a few minutes after logging in (with
GNOME shell).
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For all "Intel Ivy Bridge" user (Intel i5-3570K, HD Graphics 4000)
Unity 3D (Compiz) and Gnome-Shell (Mutter) will crash!
Only 2D Desktop (Unity-2D, ) runs stable.
(KWIN not tested!)
Maybe it's time for a new bug report?
All Systems with integrated Intel HD Graphics 4000 randomly freezes in
3D-
It doesn't seem to be related to the Atheros Network Adaptor as I
suggested before. Though my system becomes more stable not using
wireless networking it seems to be a problem caused by system load/
screen refresh. As soon as I start a video in Totem my system hangs
after not more than a couple of
I've been having the same issue:
Intel® Core™ i5-3570K CPU @ 3.40GHz
MSI Z77A-G43
16GB RAM DDR3
Using onboard graphics
- The machine randomly freezes. It completely locks up, ie. keyboard cap locks
indicator won't even change, mouse cursor won't move, screen is completely
stuck.
I seemed to
Unpredictable machine hangs for me too.
Mouse freeze and keyboard unresponsive.
Intel Core i5 3570K 3.4GHz LGA 1155 Processor Intel Core i5 3570K 3.4GHz LGA
1155
Gigabyte Z77X-UD3H
8GB Corsair DDR3 Vengeance
Using the onboard HD4000 GPU
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Same issue here.
Machine hangs hard about once every 24 hours.
Mouse is NOT responsive - can not move or click the mouse.
Keyboard is NOT responsive.
Can not Ctrl-F1.
Can not Magic SysRq.
Intel Core i5 3570K 3.4GHz LGA 1155 Processor Intel Core i5 3570K 3.4GHz LGA
1155 Processor
ASUS P8
No wireless here, desktop LAN with Realtek RTL8111DL.
So far 3 days with no freezes in 2d
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Title:
ubuntu 12.04 64bit completely freezes frequently
Ethernet controller: Atheros Communications Inc. AR242x / AR542x
Wireless Network Adapter (PCI-Express) (rev 01)
Network adaptor seems to play a role with this bug. Without the network
controller activated my system seems stable, but as soon as a switch on
my network my system reacts differently:
I have had the same Virtualbox freeze after upgrading to 12.04 from
11.10. Prior to this Virtualbox worked flawlessly. I tried some of the
suggested fixes, and nothing helps. The only solution is to lean on the
power button until it shuts off.
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Additional info: Atheros Communications Inc. AR5212/AR5213 Wireless
Network Adapter here.
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Title:
ubuntu 12.04 64bit completely freezes frequently
If it helps, sometimes i'm able to log in froma another machine using ssh.
But I don't know where to start debugging since I've no idea what is causing
the freeze.
Alse: I think this bug should be given more priority since it renders my PC
ununsable for serious work.
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Fix a typo in previous post
"The same exact looking card in another box reporting as >>>
instead didn't give me the problem."
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Title:
ubuntu
For those of you with TOTAL freeze and using ath9k driver for a wireless
card I have been able to fix the problem.
So, my case seemed to be really the wireless driver + the model in used,
concretly an AR9287 as reported by lspci.
The same exact looking card in another box reporting as AR9287 inst
Random freezes, I can access the console and move the mouse, its happens
at least one time a day.
Machine specs :
RAM 8GB
CPU Intel Xeon E31225@3.1ghz
VGA Xeon E3-1200 Processor Family Integrated Graphics Controller
Ubuntu 12.04 LTS 64bits (from 11.10)
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Excuse my previous report, my wireless card is a AR9287. I see many
reports of freezes with this model, even in FREEBSD, googling to find a
fix desperately.
The other machine where I was reporting from that never freezes has a
AR9227, and it is a 32 bit system.
As many say it is obvious some peop
I have a:
02:00.0 Ethernet controller: Atheros Communications Inc. AR8151 v2.0 Gigabit
Ethernet (rev c0)
Kernel driver in use: atl1c
in my case, only unity 3d desktop / compiz freezes. unity-2d works fine.
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This is obviously at least 2 or 3 different problems. My problems seem
to have cleared up after upgrading to NVIDIA's 295.49 drivers. My SysRq
key continued to work even under massive lockup.
Most of us experienced common symptoms: A near complete system freeze
with mouse continuing to work impl
A question to everyone.
Which network card are you using to connect to internet?
I have a:
06:00.0 Network controller: Atheros Communications Inc. AR9227 Wireless Network
Adapter (rev 01)
which is used by the ATH9K driver.
I have tried Linux mint 12, Debian stable and I have had freezes in all
the problem is, how to debug this bug ?!
the machine freezes completely, no mouse or keyboard response.
no chance to switch tty1, tty2 ... Magic SysRq also not working... the machine
is completely death :(
unity-2d works fine, but unity/compiz is prettier.
machine specs:
os: ubuntu 12.04 , 64bit
I've never had an Ubuntu problem like this one and will need to switch
distros if it's not fixed. Should I switch to Debian?
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Title:
ubuntu 12.04
I agree, 3d may be the issue. I have a Nvidia graphics card I'm running
from and have been testing on 2d for 2 days now, I haven't been able to
reproduce the freeze. Although I can't stand the 2d environment, it is
stable so far, not one problem. Hopefully some developers notice this
;-)
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I get complete freezes running Ubuntu 12.04 64 bit on an Intel Ivy
Bridge machine with integrated graphics.
For me, one way to induce a freeze is to randomly drag the map in Google
Maps, both in Firefox and Chromium. The freeze will occur within a few
seconds of dragging. This happens in Unity 3D
Should the bug title not be changed to reflect that it happens in both
32 bit and 64 bit systems?
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Title:
ubuntu 12.04 64bit completely freezes fr
Yesterday I did test run Ubuntu 12.04 32 bit from CD without any updates
or closed source drivers. That went perfectly well: no hanging system,
good performance. I'd love to install 12.04 32 bit and see how it does
after taking the closed source nvidia drivers and updates, but I'm
affraid I have an
same here (see comment #47)
my workaround is unity-2d ;)
please test unity-2d... the problem is 3d desktop related...
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Title:
ubuntu 12.04 64bit c
When my system freezes the mouse and everything else is unresponsive - I
can't even get to a console. Also any music or video that is completely
playing stops as well i.e. a complete freeze
I'm running Ubuntu 12.04 on a Dell Studio 1555 laptop with ATI Radeon
graphics (flgrx driver)
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I read all the issues written over here. Well the problem happens to me
as well. This is happening from ubuntu 11.04 while using ubuntu 3d in
respect of 32 bit or 64 bit. The main problem is the the Xorg freezes.
Mouse can be moved but no response. The freeze is on the screen. But
what ever is runn
My machine also freezes completely, no mouse or keyboard response, but only in
unity.
it freezes mostly in firefox (klick on tab or link), but also in ubuntu
software-center or chromium-browser (rare).
important:
unity-2d works fine!
I can browse the web in unity-2d without any freezes.
I can pl
Indeed, I have just tried the 295.49 driver from nvidia, removing
everything nvidia from ubuntu previously and I still got the freeze.
I also installed latest oneiric kernel with the same result to see if I
get lucky as @yorgasor and still got the total freeze.
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@Trevor Bradley ..I'm not so sure the Nvidia drivers have much to do
with it, I am running 2 monitors and they are a "no go" with Nvidia. I
have to use the open source drivers cause the one's from Nvidia will
white screen one monitor and the cursor turns to an x.
For others, mine is also 32bit an
I suffer the same fatal bug ( yes, Since it's been UDS these last week, the bug
might have passed unseen?).
A fatal bug that prevents even the advanced and experts from using Ubuntu 12.04
LTS as a Production machine and home desktop OS.
In my case, the system freezes completely with no ability to
I've manage to radically reduce the instability on my machine my
upgrading my NVIDIA drivers from 295.40 to 295.49:
https://launchpad.net/~ubuntu-x-swat/+archive/x-updates/+build/3482042
(i386). amd64 can similiarly be grabbed from launchpad)
I don't think it's the entire picture, but not crashin
I have the same problem too with 32 bit version.
I noticed it often happens while i'm using the mouse scroll, maybe it could
help finding a solution.
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Fails the same way for me too. Sometimes a complete freeze, sometimes I
am able to switch to the text terminal.
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Title:
ubuntu 12.04 64bit complet
@ Norm. That's bad. I wanted to try the 32 bit version as I encounter
the freezes with the 64 bit version. But if the 32 bit version does the
same than that's no way out. Did you try the 64 bit version as well?
It's necessary for the solution of this bug to know if both versions (64
and 32 bit) hav
I have the same problem with the 32 Bit version.
Frequent random lockups, the only thing that will work is the mouse cursor,
hard reset to recover.
The problem has also occurred during normal shutdown and system hangs and
needs to be powered off to shutdown.
Have been forced to go back to Win
I've managed to solve my problem by using kernel 3.0.0-17-generic x86_64
from 11.10, and I've gone a couple days now without any lockup.
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Title:
u
I must say I have installed 12.04 succesfully in 3 other machines with
no freezes, so maybe this is happening on fairly new type of hardware?
My results in different boxes:
* Lenovo T400 laptop, Intel Integrated, 32bit install, successful
* Intel Core Duo E6600, 32bit install, Nvidia Gforce 210, s
I tried compiling the kernel from kernel.org, version 3.3.5, it took a
while but it also freezed completely (machine completely unresponsive,
no mouse or ping or ctrl+alt+f1 out of it) same as with ubuntu stock
kernel.
I am including my syslog of the whole evening with the two different
kernels (u
Hi,
some problem for me with oneiric kernel 3.0.0-19-generic gnome 3.2.1 64
bit - with today latest update .
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Title:
ubuntu 12.04 64bit completel
For me it's enough now. I'm going to downgrade to 11.10/ reinstall
11.10. That version at least worked! Just got 5 times a hanging system
in just 20 minutes: this is ridiculous!
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After a large update yesterday including Compiz I hoped we would have
some solution. Nope. My system still randomly freezes and my screen
flashes like a strobe light in the discotheque sometimes.
What really bothers me is that if you google you see that lots and lots
of Pangolin users suffer from
Random freezes, I can access the console and move the mouse.
Thinkpad T60 (ATI X1400, 12.04 x64)
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Title:
ubuntu 12.04 64bit completely freezes fr
I've trying to do some lite work today fixing my conkys that got messed up from
stupidly installing 12.04 and had a freeze every 5-8 minutes for 2 hours, it
won't be long and I'll have to replace my reset button o.O I should have stayed
with 11.04.
Was using gedit and viewing my home folder only
I've been using the last kernel released with 11.10 since my crash
yesterday. So far, I haven't had any problems. If I can last another
day, I'll be 95% sure that solved the problem. I don't think I've gone
2 days since my upgrade on this computer. Oddly enough, I've upgraded 3
other laptops as
Has anyone tried compiling and working with a different kernel version
than the one which ships with ubuntu?
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Title:
ubuntu 12.04 64bit completely
Not sure if its related but i have a similar problem after the upgrade from
10.04 to 12.04.
I usually get a freeze when i close tabs in my browser (often with flash
elements, Opera) or just opening a link with a flash video.
After a while opera will be responsive again since the plugin are calle
Same problem, freezing completely no input response at all. It
definately looks like there's two bugs here:
One where just the display freezes CTRL/ALT/F1 allows access to a terminal.
One where system locks completely requiring hard reboot.
I'm guessing the hard freeze issues relate to a bug here
Same here, X is freezing a couple of times a day, mouse still movable,
no clicks/keyboard input accepted, but can switch login on a console via
e.g. Alt+F1.
Running on an Lenovo R60 with an ATI Radeon X1400, updated 12.04 from
11.10; system was perfectly stable before the dist-upgrade.
Happy to p
My system freezes every few hours.
I've used ctrl-alt-fn+F1 to switch to another terminal and open a sudo
bash shell and then back to my 64 bit 12.04 LTS Ubuntu Desktop (Lenovo
Thinkpad E520) to keep working as long as possible before having to do a
hard reboot.
Freezes happen less frequently whe
I'm adding an update to my previous post, system has froze 5 times this morning
and I have part of a log file from the incidents. Every freeze shows the same
entries and can not access terminal through ctrl+alt+f2...
-
May 10 16:27:04 brendan-MS-7636 kernel: [ 6695.819009
Switching to nvidia drivers 295.49 and fixing a conflict in CompizConfig
where both the Unity Application switcher and Application Switcher were
activated simultaneously seems to have resolved the issue on my work
computer. Crossing fingers that I can fix things when I get home...
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The freezing is so bad I'm often unable to switch to a terminal with
Ctrl-Alt-F1, and when I can't I can't get past the password prompt. The
whole thing just seizes up. I could try having a terminal open from
another machine and watch the behaviour of top.
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This is hitting both my home server and my work desktop hard.
I can freeze my 64 bit 12.04 desktop by opening a few windows (firefox,
thunderbird, rhythmbox) and holding down alt-tab for a few seconds. My
home server is freezing about every 24-48 hours and my software RAID
isn't very happy about
It looks like we may have two separate bugs. People who have their
xsession mostly freeze but can still access the console and move the
mouse, and those whose systems completely lock up. I'm getting the
'completely locked up' problem.
I started with the default nvidia drivers. I would get almos
Problem : Ubuntu 12.04 freezes , not able to click any button on
keyboard or mouse , unable to go to console or reboot. the screen looks
3/4th black and 1/4th grey color. power off is the only option.
some more details.
I am using Intel i5 Dell laptop with 8GB RAM, Upgraded from Ubuntu 11.10 to
1
Same problem here, freezes about once every work day, which is rather
alarming. Mouse moves and music keeps playing. I can Ctrl+Alt+F1 into
the console, but if i try to go back without restarting anything, it
will lock down completely, with a hard reset left as the only option.
Release: 12.04 64-b
I'm also having a similar complete freeze, no mouse movement. Fresh
install 12.04 32bit is freezing every so often. Was watching a video
earlier, noticed the curser was no longer moving for me then the video
started shuddering. Was typing an email a few minutes ago when it froze
again. I think this
This bug seems to affect me as well. Ubuntu 12.04 64bit, Nvidia 295.40.
Screen freezes and the cursor stops moving. Also experienced a black screen
followed by a forced reebot.
Other operating systems on the computer works fine.
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I think this could help. The bug just appeared again as I was within a
gnome classic (WITH effects) session with my ubuntu 12.04 64 bits.
So it looks like it's really a issue of compiz and not really a bug in
unity.
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