qt4 applications have transparent screen inside

[michelinux]

many new qt4 apps, like dragon player, krdc (I noticed the same for virtualbox too), when playing a movie, or watching a remote dessktop or running virtual machine, present transparent screen

[lspci]
00:00.0 Host bridge [0600]: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub [8086:27a0] (rev 03)
     Subsystem: Hewlett-Packard Company Device [103c:30bb]
01:00.0 VGA compatible controller [0300]: nVidia Corporation G72M [GeForce Go 7400] [10de:01d8] (rev a1)
     Subsystem: Hewlett-Packard Company Device [103c:30bb]

[Jonathan Thomas (echidnaman)]

Could you please provide a screenshot, if possible?

[michelinux (mich-delbianco)]

this is a screenshot about krdc

[michelinux (mich-delbianco)]

this is dragon player
xine, vlc etc. works fine

[michelinux (mich-delbianco)]

system: kubuntu 9.04 amd64
graphic card: nvidia -> driver nvidia-glx-180

another box with nvidia & amd64 have the same problem
a third box with nvidia but i386 works fine

[michelinux (mich-delbianco)]

correction, after installing some packages the 32bit machines was affected by the same problem, have to find the package who makes the change

[michelinux (mich-delbianco)]

64bit kubuntu with ATI graphic card isn't affected by this problem
Could it be an nVidia driver problem?

[Jonathan Thomas (echidnaman)]

That's a possibility. Could you provide the following so that we can move this bug to the correct nvidia package?

- A copy of /var/log/Xorg.0.log
- The output of the command lspci -vvnn

Thanks in advance.

[michelinux (mich-delbianco)]

thanks to you Jonathan, here are the outputs

[michelinux (mich-delbianco)]

i've noticed the same problem with an older version of the nvidia driver (version 173).

good news: updated virtualbox to 3.0.8 and the problem seems resolved, no more transparent screen

[michelinux (mich-delbianco)]

update:
report after karmic upgrade

skype solves the problem in the video call window

krdc, dragonplayer still affected
kaffeine wasn't affected in latest version, now it's affected too (same transparent window when playing video)

so, I think it could be something wrong in qt4-nvidia driver communication

[michelinux (mich-delbianco)]

look at this:

http://www.qtforum.org/article/26669/qt4-mess-up-the-opengl-context.html

even on qt forum noone knows how to resolve this bug

[michelinux (mich-delbianco)]

no, please, this bug is still unresolved, even on karmic
skype too is affected

[michelinux (mich-delbianco)]

I meant lucid, I mistake every time between version names

[michelinux (mich-delbianco)]

this bug seems completely resolved in natty

[michelinux (mich-delbianco)]

It would be interesting to know what's changed in last release