The bug is still happening to me with a fully updated Natty.
How I can set compiz to run with vblank_mode=0 and vsync disabled to prevent
this, as suggested on comment #32 ?
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No, the bug still appears in compiz (1:0.9.4+bzr20110415-0ubuntu2) natty. I am
working on Ubuntu natty Unity
with compiz (1:0.9.4+bzr20110415-0ubuntu2. And my system halted a lot of times
everyday.
I am using the experimental nouveau driver. Here is my backtrace:
[ 22727.289] [mi] EQ
** Changed in: unity
Milestone: 3.8.10 = 3.8.12
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Title:
compiz hangs randomly several times per day
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Ok. I
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Title:
compiz hangs randomly several times per day
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Ahem. I've traced this locally and it doesn't *seem* to be a compiz
problem. Compiz is waiting for the next frame, and X is waiting for the
kernel to tell it the next frame has happened.
Adding a kernel task, as it looks like that's where the problem lies.
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Ok. So, for a work around I think we can start compiz with the
vblank_mode=0 environment set and vsync disabled; this will stop compiz
being blocked waiting on vsync, but in return allow some tearing to
occur.
With vblank_mode=0 I can toggle dpms on/off with a GL screensaver
running - which
Chris: I notice that from your kernel log it looks like the driver is
scanning for vblank changes on two CRTCs - do you have a dual-monitor
setup, and if so, what are its details?
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** Changed in: unity
Status: Fix Committed = Triaged
** Changed in: compiz (Ubuntu Natty)
Status: Fix Released = Triaged
** Changed in: unity (Ubuntu Natty)
Status: Fix Committed = Triaged
** Changed in: unity (Ubuntu Natty)
Importance: Undecided = High
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This happens to me too often, sometimes when i lock the screen.
How I can help debugging?
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Title:
compiz hangs randomly several times per day
Just got a new crash now, while using Chrome (dev channel). I forgot to
say that after the crash I get the gdm login page.
Last lines I see on syslog just after the crash are
Apr 18 12:25:47 shrimp gdm-simple-slave[8578]: WARNING: Unable to load file
'/etc/gdm/custom.conf': File o directory non
To clarify: I think the bug is now at the Xlib/driver level, not so much
in Unity or Compiz anymore. Sam stays around if there is something to do
at the compiz or unity level to find a workaround.
** Changed in: compiz (Ubuntu Natty)
Assignee: Sam SmSpillaz Spilsbury (smspillaz) = Chris
Darn. I think that demonstrates that this is a separate bug. There
certainly *were* corner cases with grabs being hit, but yours doesn't
appear to be one.
Oh, well. It was a nice weekend with the delusion of this being fixed!
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Chris, can you confirm this also happens with vsync disabled? That is
the only case I can think of where the grab shouldn't be relevant
anyhow.
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Note, this has happened 3 times this afternoon. grabState is 0 when it
happens. Not sure if that's what you expect ;)
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Title:
compiz hangs
I think I've discovered an underlying cause of these hangs - compiz
taking a server grab and not flushing its command buffers - and have
pointed DX at the fix.
To confirm this hypothesis, next time you see this freeze could you
attach gdb to the *X* process (with “sudo gdb Xorg $(pgrep X)”) and
** Branch linked: lp:~unity-team/compiz/trunk
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Title:
compiz hangs randomly several times per day
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** Changed in: compiz (Ubuntu Natty)
Status: Incomplete = Fix Committed
** Changed in: compiz (Ubuntu Natty)
Assignee: Chris Halse Rogers (raof) = Sam SmSpillaz Spilsbury
(smspillaz)
** Also affects: unity
Importance: Undecided
Status: New
** Changed in: unity
** Branch linked: lp:compiz
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Title:
compiz hangs randomly several times per day
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This bug was fixed in the package compiz - 1:0.9.4+bzr20110415-0ubuntu1
---
compiz (1:0.9.4+bzr20110415-0ubuntu1) natty; urgency=low
* New upstream snapshot
- Focus problem with Thunderbird (LP: #753951)
- Chromium fullscreen + Alt-TAB confuses the launcher (LP: #757434)
** Branch linked: lp:ubuntu/compiz
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Title:
compiz hangs randomly several times per day
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** Changed in: unity (Ubuntu Natty)
Status: New = Fix Committed
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Title:
compiz hangs randomly several times per day
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@jamson: those artifacts should be fixed now with the compiz version you
can find in our daily builds at
https://launchpad.net/~unity/+archive/daily
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Note, I can reproduce this quite easily by closing and opening the lid
on my laptop a few times
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Title:
compiz hangs randomly several times per
** Also affects: compiz (Ubuntu Natty)
Importance: High
Assignee: Chris Halse Rogers (raof)
Status: Confirmed
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Title:
compiz hangs
Can you disable vsync and see if it still happens?
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Title:
compiz hangs randomly several times per day
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disabling vsync does not help. tried that before. Other thing to note -
there are also some artifacts - for example adding bookmark in Chromium
by clicking star icon and then Done, sometimes leaves gray menu shape,
that is not removed until content is scrolled.
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Can you disable vsync and then get another trace. It will be different.
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Title:
compiz hangs randomly several times per day
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We had killed one of them in latest unity release (3.8.6), is it still
happening with this?
The only time I get some X freeze now is when my hard drive is writing
like crazy (seems chromium and firefox doing that), and no refresh of
compiz meanwhile…
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Yeah. Jason has worked around one particularly easy to trigger hang,
but it's a more general problem and there are still edges to hit.
** Changed in: compiz (Ubuntu)
Assignee: (unassigned) = Chris Halse Rogers (raof)
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Ubuntu 11.04:
Compiz generally only crashes when I run a pyqt gui programme from Python. I'm
just left with the desktop background (with no ability to report the
problem)and have to manually switch off.
Hope this helps to pin-point the problem.
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I guess the next thing for me to try when it happens is to attach gdb to
X to see what it is doing, perhaps?
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Title:
compiz hangs randomly
status confirmed
importance high
assign me
milestone ubuntu-11.04
I can reproduce this easily, both on Intel and Radeon hardware.
I'm not sure yet where in the stack this problem is - it could be X,
libX11, or compiz - but to the user it appears as a system-freeze and
it's reasonably easy to
I am seeing this on two laptops. It happens only(?) when flash video is playing
and display switches off/goes to sleep. And not every time. One thing to note
is that switching to vt1 and
#export DISPLAY=:0.0; killall -9 compiz; compiz --replace
fixes problem - compiz comes up and display is
Hm. Jason Smith has brought up a bug with similar symptoms to this -
hanging in poll from _XReply - which suggests that this might not
actually be a driver problem at all, but a more general X/libX11 bug.
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I just recreated this with drm.debug=0x1. The log is huge though, so it
might be pretty difficult for you to parse.
Note, this log contains a few days of information in it, probably the
only relevant bit is from today (Apr 19th). I managed to do it within 5
minutes or so of booting up (it's quite
That looks to me awfully like an entirely idle gpu.
My hypothesis is that the driver has missed the vblank interrupt, so the
MSC compiz is waiting on will never be raised.
Could you please add ‘drm.debug=0x1’ to your kernel command line and
attach dmesg next time this happens? That should spit
Here we go :)
** Attachment added: Output of intel_gpu_dump
https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/740126/+attachment/1948595/+files/dump
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** Tags removed: unity-priority
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Title:
compiz hangs randomly several times per day
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Next time someone encounters this bug, could you please attach the
output of “sudo intel_gpu_dump”?
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Title:
compiz hangs randomly several times
** Tags added: unity
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Title:
compiz hangs randomly several times per day
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Not sure this is unity-related, I see this with the classic 3D desktop
as well.
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Title:
compiz hangs randomly several times per day
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From IRC a few days ago:
[11:33] chrisccoulson RAOF, if you're interested, here's the compiz hang i
was talking about yesterday - bug 740126 ;)
[11:33] ubot2 Launchpad bug 740126 in compiz compiz hangs randomly several
times per day [Undecided,New] https://launchpad.net/bugs/740126
[11:33]
** Changed in: compiz (Ubuntu)
Status: Triaged = Incomplete
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Title:
compiz hangs randomly several times per day
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I have a similar bug. In my case the screen stays black except for the
mouse cursor. It is not frozen though, I can move the mouse cursor just
fine and it changes shape when I get in the middle of the screen (over
the invisible password prompt). When I blindly enter my password the
screen gets
I don't get that so often, but I get some as well. Setting on the
priority list.
** Changed in: compiz (Ubuntu)
Status: New = Triaged
** Changed in: compiz (Ubuntu)
Importance: Undecided = High
** Tags added: unity-priority
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