[Xfce-bugs] [XFCE 0000245]: _NET_WM_STATE_FULLSCREEN issues with xfwm4

Wed Jun 30 18:09:31 CEST 2004

A BUGNOTE has been added to this bug.
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http://bugs.xfce.org/view_bug_page.php?f_id=0000245
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Reporter:                   dob
Handler:                    
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Project:                    XFCE
Bug ID:                     0000245
Category:                   xfwm
Reproducibility:            always
Severity:                   feature
Priority:                   normal
Status:                     new
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Date Submitted:             2004-06-28 02:01 GMT
Last Modified:              2004-06-30 16:09 GMT
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Summary:                    _NET_WM_STATE_FULLSCREEN issues with xfwm4
Description: 
When I try to enter full screen mode with xawtv or xawdecode (TV viewing
apps), instead of enjoying the TV picture in fullscreen (this is what I
get with kwin, fluxbox, fvwm etc.), with xfwm4 and metacity, what I see is
basically:
- the xfce4 taskbar at the top
- xawtv's window decoration
- xawtv's left window frame
- I get the TV on the rest of the screen, although it's truncated.
Screenshot: http://abusenospam.free.fr/bug.png

Expected result: Have the TV in fullscreen like I get with other window
managers

I think it's the same issue that was brought up here for metacity but
never resolved:
http://mail.gnome.org/archives/wm-spec-list/2003-February/msg00001.html
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 olivier - 2004-06-28 20:27 GMT 
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What version of XawTV? 

I'm really having no problem at all with XawTV/fullscreen here.

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 dob - 2004-06-28 23:42 GMT 
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My bad.

I had not tested xawtv in a while. And since at some point I had the same
problem with both xawtv and xawdecode, and since I still have it with
xawdecode, I assumed that the problem would still be there with xawtv.

Xawdecode's website is http://xawdecode.sourceforge.net/ , and source &
binaries can be downloaded from
http://sourceforge.net/project/showfiles.php?group_id=67268

However, I also have a fullscreen bug with xawtv & xfwm4, but a different
one.
I run X with a custom resolution:  1112x834 (it gives me more space than
1024x768 and a better refresh rate than 1152x864).

If I set my resolution to 1024x768, fullscreen works fine, but at
1112x834, the fullscreened xawtv window does not cover the whole screen.
The bottom and right part of the screen show the desktop. On the
screenshot, the TV surface (blue) measures 1088x816.
Screenshot: http://abusenospam.free.fr/bug2.png
(again no such problem in other wms like fluxbox or kwin)
Here's the modeline I used if you want to try to reproduce it:

ModeLine "1112x834" 99.37 1112 1160 1400 1496 834 836 848 874
http://bugs.xfce.org/view_bug_page.php?f_id=76Hz

edited on: 06-28 23:42

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 olivier - 2004-06-29 05:33 GMT 
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That's prolly because the aspect ratio is not the same. xfwm4 (unlike many
other WM, including metacity for example) does implement aspect ratio and
check for it even in fullscreen mode.

edited on: 06-29 05:33

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 olivier - 2004-06-29 05:45 GMT 
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Can you try this version:

http://www.xfce.org/archive/test/xfwm4-4.0.6-cvs.tar.gz

This one ignore the app's size hints in fullscreen mode

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 dob - 2004-06-29 11:52 GMT 
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I'll try 4.0.6-cvs tonight

Regarding the aspect ratio, 1112x834 is strictly 4/3, like 1024x768 etc.
But it's true that I don't have that fullscreen bug with xawtv when using
metacity & 1112x834.

I do have the exact same xawdecode fullscreen bug with both metacity and
xfwm though.

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 dob - 2004-06-29 19:45 GMT 
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Xawtv's fullscreen works fine at my weird resolution with 4.0.6-cvs

I still have the same issue with xawdecode, but I think it was expected
;)
I could use xawtv over xawdecode, but
- with xawtv I have a large green stripe on the right in fullscreen mode
(in all wms this time), I don't have this with xawdecode
- with xawdecode I can have a fullscreen image in fullscreen mode using
overlay (takes 0% of cpu time), whereas with xawtv I have to use
grabdisplay (=40% cpu)
- it's a bug in xfwm4 anyway ;)

-----------------------------------------------------------------------
 olivier - 2004-06-29 19:49 GMT 
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I don't think it's a bug in xfwm4. Try tvtime instead.

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 dob - 2004-06-30 11:16 GMT 
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Thank you for your suggestion of trying tvtime. However, its cpu usage is
even worse than xawtv's (grabdisplay+deinterlace), so it's not really what
I'm looking for.

And like I argued, it doesn't change the fact that it's a bug in xfwm4,
imho of course.
What lead me to think that?
It's simple.
In my xfce4 session, if I kill xfwm4 and start fluxbox, enlightenment or
kwin, suddently the fullscreen mode of xawdecode works as expected (and I
still have xftaskbar4 running at the top of the screen, and it is not
covered when I maximize a window etc.).

And although I have not tested it myself, others have reported that it
works with Openbox, BlackBox, IceWM, AfterStep, fvwm2, fvwm1 and sawfish.

Also, I have just noticed that if I set the xawdecode window to be on top
before I fullscreen it, then the fullscreen mode works correctly.
Could it be what the other wms are doing that xfwm does not?
Shouldn't a fullscreen window be always on top anyway?

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 olivier - 2004-06-30 16:09 GMT 
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It *is* a xawdecode bug, please direct this to xawdecode devel team.

xprop on the window shows itdoesn't switch to fullscreen, just "above":

_NET_WM_STATE(ATOM) = _NET_WM_STATE_ABOVE

It is not followingthe standard. As for other WM being nice with such an
app, sorry, it's doesn't prove that's a bug in xfwm4.