In Gnome Shell adding this line to /etc/environment:
CLUTTER_PAINT=disable-clipped-redraws:disable-culling
totally solves both tearing and performance issues in the same time on my
configuration, Nvidia ION.
Though I don't know what exactly this line does, I hope this information can be
@ leuke
That really worked for me too, on my nvidia cart. This also could be a
solution to bug #764330
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https://bugs.launchpad.net/bugs/880707
Title:
[regression] Visible tearing is
Hi Daniel,
This are my results:
1. OpenGL Sync To VBlank = ON
Workarounds Force full screen redraw (buffer swap) on repaint = ON
No tearing at all, but with this settings video playback is quite jittery and
widow movement looks worst. It's very slow and windows lag behind mouse.
2. OpenGL
Tomek, that's good news. Your preferred configuration is the default
configuration for compiz in Ubuntu.
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Title:
[regression] Visible tearing is
The theoretically perfect solution, for optimal performance and zero
tearing, is proposed in bug 901097. However it's presently buggy and
requires more work, possibly a lot more work.
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Hi Daniel,
Thanks for pointing me to this bug and your patches. I can confirm that
after installing them there's just occasional video tearing in Unity -
similar to Gnome 2 and Gnome Shell.
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If you would like to eliminate the possibility of tearing then the best
solution might be in CCSM:
Workarounds Force full screen redraw (buffer swap) on repaint = ON
OpenGL Sync To VBlank = OFF
(still using ppa:vanvugt/compiz ideally)
In my experience this config looks the nicest. But it's
** Tags added: performance
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Title:
[regression] Visible tearing is worse in 11.10 than 11.04, even when
Sync To VBlank is enabled, but only
Thank you very much Daniel for your unity and compiz patches.
For me the situation is a little complicated, using a Nvidia ION platform I get:
- heavy tearing using Unity and Unity-2d, kwin, Windows 7 with aero disabled
- minor tearing using Gnome-shell (upper part of the screen).
- zero
After a lot of fiddling, I finally found something that works for me:
Turn vysnc on in both NVIDIA and Compiz.
Do NOT turn on undirect fullscreen windows. Leave that workaround UNCHECKED
or you'll have tearing in fullscreen.
Then do either of the following
A) Turn allow flipping OFF in Nvidia
I don't expect the compiz portion of this fix will be seen in an Ubuntu
release until 12.04. No need for me to have it in progress. Still
keeping the upstream portion in my name.
** Changed in: compiz (Ubuntu)
Status: In Progress = Confirmed
** Changed in: compiz (Ubuntu)
Assignee:
** Changed in: compiz (Ubuntu)
Status: Confirmed = In Progress
** Changed in: compiz (Ubuntu)
Assignee: (unassigned) = Daniel van Vugt (vanvugt)
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Experimental fixes for this and related performance bugs are now available
for testing in ppa:vanvugt/compiz and ppa:vanvugt/unity. For the best
results I recommend trying both together. But testing them individually is
useful too.
IMPORTANT NOTES:
* The fixes in ppa:vanvugt/compiz REQUIRE
** Changed in: compiz-core
Milestone: None = 0.9.6
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Title:
[regression] Visible tearing is worse in 11.10 than 11.04, even when
Sync To
** Changed in: compiz-core
Importance: Medium = High
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Title:
[regression] Visible tearing is worse in 11.10 than 11.04, even when
Sync To
With respect to this bug, it is the tearing seen when dragging windows
around when running Unity.
This bug is mainly about the fact that it got noticeably worse in 11.10
compared to 11.04. The precise reason why it got worse is detailed here:
Will be interested to see the results, as far as tearing in video
scenes prone to it or tearing tests 11.10 is the 1st release I've
never been able to totally remove, though it extends to all sessions.
Interesting about the 'latency regression', there is something i've seen
on a nvidia laptop
** Changed in: unity
Importance: Undecided = High
** Changed in: unity (Ubuntu)
Importance: Medium = High
** Changed in: compiz (Ubuntu)
Importance: Medium = High
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When I was testing with the nvidia driver I did spend some time watching
Powermizer to see if it was able to idle more often, but couldn't see an
obvious improvement. Powermizer successfully clocked down to low power
mode in all cases when /fairly/ idle, with or without the fix. No I
haven't
** Summary changed:
- [regression] Visible tearing occurs even when Sync To VBlank is enabled,
but only when Unity is active.
+ [regression] Visible tearing is worse in 11.10 than 11.04, even when Sync To
VBlank is enabled, but only when Unity is active.
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** Description changed:
You might expect that with Sync To VBlank enabled in compiz that video
tearing doesn't happen. But it does, just less often.
This appears to be a regression in Ubuntu 11.10, because in 11.04 Sync
to VBlank was working reliably and eliminated tearing.
What means are you using to determine video tearing? Seems a bit of a
stretch to lay the cause of h. tearing solely on the unityshell plugin,
certainly in the case of nvidia
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