[Bug 97796] Parts of screen do not update

[Bug 97796] Parts of screen do not update

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=97796

            Bug ID: 97796
           Summary: Parts of screen do not update
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/other
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: pmenzel@molgen.mpg.de

Created attachment 126486
  --> https://bugs.freedesktop.org/attachment.cgi?id=126486&action=edit
Screenshot to show tags and bar in window manager *awesome*

Using Linux 4.8-rc5, with X.Org X Server 1.18.4, certain parts of the screen do
not update right away. This happens in Xfce 4.12 [1] and the window manager
*awesome* 3.5.9 [2].

1. Changing a Firefox window from maximum to “reduced”/“normal” size, the part
were the Firefox window isn’t present anymore, is still present. Switching
between windows often fixes this.

2. In the window manager *awesome* the top bar is not updated when changing
tags (think of virtual screen, although different). See the attached screen,
which doesn’t show the problem, as doing the screenshot didn’t capture it,
despite me seeing it.

[1] https://www.xfce.org
[2] https://awesomewm.org

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[Bug 97796] Parts of screen do not update

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https://bugs.freedesktop.org/show_bug.cgi?id=97796

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
If this is not the same as bug 90910, please attach the corresponding Xorg log
file.

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[Bug 97796] Parts of screen do not update

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https://bugs.freedesktop.org/show_bug.cgi?id=97796

--- Comment #2 from Paul Menzel <pmenzel@molgen.mpg.de> ---
Created attachment 126513
  --> https://bugs.freedesktop.org/attachment.cgi?id=126513&action=edit
X server log file

(In reply to Michel Dänzer from comment #1)
> If this is not the same as bug 90910, please attach the corresponding Xorg
> log file.

I don’t think it’s the same bug, as I use the integrated graphics device from
Intel with the X video driver *modesetting*.

Please find the Xorg log file attached.

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[Bug 97796] Parts of screen do not update

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https://bugs.freedesktop.org/show_bug.cgi?id=97796

--- Comment #3 from Michel Dänzer <michel@daenzer.net> ---
Are you using a compositing manager? If yes, which one, and what is its
configuration?

(In reply to Paul Menzel from comment #0)
> 2. In the window manager *awesome* the top bar is not updated when changing
> tags (think of virtual screen, although different). See the attached screen,
> which doesn’t show the problem, as doing the screenshot didn’t capture it,
> despite me seeing it.

So the screenshot doesn't match the problem you were seeing? Did taking the
screenshot also make the problem visibly disappear? If not, it sounds like it
might be a kernel driver issue.

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[Bug 97796] Parts of screen do not update

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=97796

--- Comment #4 from Paul Menzel <pmenzel@molgen.mpg.de> ---
(In reply to Michel Dänzer from comment #3)
> Are you using a compositing manager? If yes, which one, and what is its
> configuration?

I guess you mean something like Compiz? I am pretty sure I don’t. I use the
plain awesome WM, or Xfce configuration.

> (In reply to Paul Menzel from comment #0)
> > 2. In the window manager *awesome* the top bar is not updated when changing
> > tags (think of virtual screen, although different). See the attached screen,
> > which doesn’t show the problem, as doing the screenshot didn’t capture it,
> > despite me seeing it.
> 
> So the screenshot doesn't match the problem you were seeing?

Indeed. Unfortunately it does not. So when I switch to a different tag, the bar
still contains the boxes from the Firefox windows, and not the terminal, for
example.

> Did taking the screenshot also make the problem visibly disappear? If not, it
> sounds like it might be a kernel driver issue.

No, it could still visually be seen. Drawing the box for ImageMagick’s tool
`import`, some parts in the bar were visually a little corrupted, that means,
the color of some pixel changed.

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[Bug 97796] Parts of screen do not update

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=97796

--- Comment #5 from Paul Menzel <pmenzel@molgen.mpg.de> ---
Created attachment 126547
  --> https://bugs.freedesktop.org/attachment.cgi?id=126547&action=edit
Example image with offset detected by GIMP

Interestingly, opening the screenshot with GIMP it says that the PNG has an
offset.

> The PNG image you are importing specifies an offset of 192, 0. Do you want to apply that offset to the layer?

Is that normal?

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[Bug 97796] Parts of screen do not update

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https://bugs.freedesktop.org/show_bug.cgi?id=97796

--- Comment #6 from Uli Schlachter <psychon@znc.in> ---
By default awesome uses a visual with depth=32 for all of its windows. AFAIK
(someone who can reproduce this, please test), starting awesome with the
--no-argb argument (= use the root window's visual) makes these problems go
away. Also, AFAIK all kinds of screenshots show the correct data.

Oh and once upon a time (but couldn't reproduce) I saw Xephyr having this
problem, but moving the mouse pointer across the affected area of the tasklist
made the expected/real content visible (at least for the part that the mouse
pointer touched). I have no clue about the server, but this sounds like
software cursor "fixing" things?

Also, I could be mixing several different bugs which just have similar results.
At least the depth=32 might be a useful hint.
Paul, do you know if --no-argb works around these problems for you?

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[Bug 97796] Parts of screen do not update

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https://bugs.freedesktop.org/show_bug.cgi?id=97796

--- Comment #7 from Paul Menzel <pmenzel@molgen.mpg.de> ---
(In reply to Uli Schlachter from comment #6)

[…]

> Paul, do you know if --no-argb works around these problems for you?

Indeed, starting awesome with the switch `--no-argb` fixes the issue here.

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[Bug 97796] Parts of screen do not update

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https://bugs.freedesktop.org/show_bug.cgi?id=97796

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Product|DRI                         |xorg
                 CC|                            |ajax@nwnk.net
            Version|XOrg git                    |unspecified
         QA Contact|                            |xorg-team@lists.x.org
          Component|DRM/other                   |Server/Ext/Composite
           Assignee|dri-devel@lists.freedesktop |xorg-team@lists.x.org
                   |.org                        |

--- Comment #8 from Michel Dänzer <michel@daenzer.net> ---
Sounds like an issue with the automatic redirection of depth 32 windows then.
Adam, any ideas?

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