[Bug 72387] New: Tearing at one specific part of the screen on CAYMAN

[Bug 72387] New: Tearing at one specific part of the screen on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=72387

          Priority: medium
            Bug ID: 72387
          Assignee: dri-devel@lists.freedesktop.org
           Summary: Tearing at one specific part of the screen on CAYMAN
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: v10lator@myway.de
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Drivers/Gallium/r600
           Product: Mesa

I see this with games as well as on my (composited) desktop when scrolling very
fast in firefox, for example.

Let me try to explain:
If you would cut the screen horizontally in 3 pieces the line between the
middle and the down piece is where the tearing appears. It appears even with
vsync.

I tried to capture it with gtk-rekordmydesktop but for some reason the video is
tear-free.

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[Bug 72387] Tearing at one specific part of the screen on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=72387

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Please attach /var/log/Xorg.0.log and the output of dmesg.

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[Bug 72387] Tearing at one specific part of the screen on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=72387

--- Comment #2 from Kai <kai@dev.carbon-project.org> ---
Created attachment 90433
  --> https://bugs.freedesktop.org/attachment.cgi?id=90433&action=edit
dmesg output for DRM/radeon

I'm seeing this too with a PITCAIRN chip (stack detailed below). Though the
tearing (one, 27" monitor with 2560x1440, KDE 4.11, composited) appears like
five ccentimeters from the top whenever there is fast movement or quick image
changes. I'm not seeing this with Catalyst.

(Sorry for not reporting this earlier, but I totally forgot to.)

No error/warning (except not finding some cyrillic font) is logged to
Xorg.0.log – do you still want to have it?

Stack used:
GPU: "PITCAIRN" (ChipID = 0x6819)
Linux: 3.12.1
libdrm: 2.4.49-2 (Debian package)
LLVM: SVN:trunk/r195435
libclc: Git:master/8e0ea3a263
Mesa: Git:master/aad2511c6d
GLAMOR: Git:master/b418b13126
DDX: Git:master/d571d6af70
KWin: 4.11.3-2 (Debian package)

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[Bug 72387] Tearing at one specific part of the screen on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=72387

--- Comment #3 from Thomas Rohloff <v10lator@myway.de> ---
Created attachment 90445
  --> https://bugs.freedesktop.org/attachment.cgi?id=90445&action=edit
/var/log/Xorg.0.log

As Kai said there's nothing important in Xorg.log/dmesg, I attach it anyway.

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[Bug 72387] Tearing at one specific part of the screen on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=72387

Thomas Rohloff <v10lator@myway.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #90445|0                           |1
        is obsolete|                            |

--- Comment #4 from Thomas Rohloff <v10lator@myway.de> ---
Created attachment 90446
  --> https://bugs.freedesktop.org/attachment.cgi?id=90446&action=edit
dmesg output

Sorry, wrong file (just woke up).

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[Bug 72387] Tearing at one specific part of the screen on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=72387

--- Comment #5 from Thomas Rohloff <v10lator@myway.de> ---
Created attachment 90447
  --> https://bugs.freedesktop.org/attachment.cgi?id=90447&action=edit
/var/log/Xorg.0.log

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[Bug 72387] Tearing at one specific part of the screen on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=72387

Kai <kai@dev.carbon-project.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #90433|0                           |1
        is obsolete|                            |

--- Comment #6 from Kai <kai@dev.carbon-project.org> ---
Comment on attachment 90433
  --> https://bugs.freedesktop.org/attachment.cgi?id=90433
dmesg output for DRM/radeon

I think I've to withdraw my "me too". I certainly did see this in the past, but
the stack I detailed in comment 2 was wrong: I wasn't add KDE 4.11.3-2 (I
hadn't restarted X). Now, really on 4.11.3-2, I'm unable to reproduce the
tearing. What I've seen might have been an KWin issue then.

Sorry for the noise.

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[Bug 72387] Tearing at one specific part of the screen on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=72387

--- Comment #7 from Thomas Rohloff <v10lator@myway.de> ---
Well, I'm seeing this with XFCE4 and fglrx is tear-free.

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[Bug 72387] Tearing at one specific part of the screen on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=72387

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #90447|text/x-log                  |text/plain
          mime type|                            |

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[Bug 72387] Tearing at one specific part of the screen on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=72387

--- Comment #8 from Michel Dänzer <michel@daenzer.net> ---
Does it work better with EXA instead of glamor?

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[Bug 72387] Tearing at one specific part of the screen on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=72387

--- Comment #9 from Thomas Rohloff <v10lator@myway.de> ---
(In reply to comment #8)
> Does it work better with EXA instead of glamor?

No.

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[Bug 72387] Tearing at one specific part of the screen on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=72387

--- Comment #10 from Michel Dänzer <michel@daenzer.net> ---
Your options right now are basically:

* Use fullscreen apps, and make sure the compositing manager unredirects
  fullscreen windows.
* Using an OpenGL compositing manager may help to avoid tearing with
  non-fullscreen apps as well.
* Use EXA with Option "EXAVSync" (but read the radeon manpage about its
caveats).

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[Bug 72387] Tearing at one specific part of the screen on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=72387

--- Comment #11 from Thomas Rohloff <v10lator@myway.de> ---
(In reply to Michel Dänzer from comment #10)
> Your options right now are basically:
> 
> * Use fullscreen apps, and make sure the compositing manager unredirects
>   fullscreen windows.
> * Using an OpenGL compositing manager may help to avoid tearing with
>   non-fullscreen apps as well.
> * Use EXA with Option "EXAVSync" (but read the radeon manpage about its
> caveats).

I'm now on LXQT with compton as compositor. The tearing is still there.

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[Bug 72387] Tearing at one specific part of the screen on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=72387

--- Comment #12 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Thomas Rohloff from comment #11)
> I'm now on LXQT with compton as compositor. The tearing is still there.

What command line parameters / configuration are you using for compton?
Something like

 compton --backend glx --glx-swap-method 2 --unredir-if-possible

works well for me.

With current xf86-video-ati Git master, you can also try Option "TearFree",
which should prevent tearing even without a compositing manager. Its downside
is that it disables DRI page flipping ATM.

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[Bug 72387] Tearing at one specific part of the screen on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=72387

--- Comment #13 from Thomas Rohloff <v10lator@myway.de> ---
Created attachment 119001
  --> https://bugs.freedesktop.org/attachment.cgi?id=119001&action=edit
.compton.conf

This is my compton config file. Tearing happens with (unredirected) fullscreen
apps, too.

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[Bug 72387] Tearing at one specific part of the screen on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=72387

--- Comment #14 from Thomas Rohloff <v10lator@myway.de> ---
Added

glx-swap-method = 2

to the config. Tearing still there.

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https://bugs.freedesktop.org/show_bug.cgi?id=72387

GitLab Migration User <gitlab-migration@fdo.invalid> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEW                         |RESOLVED

--- Comment #15 from GitLab Migration User <gitlab-migration@fdo.invalid> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/474.

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