[Bug 102384] corruption/glitch on right click contextual menu, drop down menus with glamor in kwin

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102384

--- Comment #9 from Barto <mister.freeman at laposte.net> ---
I made a discovery :

- if I use the "modesetting" driver with glamor ( instead of using
xf86-video-ati ), then all is ok, even if DRI 3 and glamor are actived,

I use this conf file :

Section "Device"
    Identifier "Radeon"
    Driver "modesetting"
    Option "TearFree" "off"
    Option "DRI" "3"
    Option "AccelMethod" "glamor"
EndSection

with "modesetting" driver the info "dri 3" doesn't appear on Xorg.log but dri 3
is used if I check in glxinfo ( with LIBGL_DEBUG=verbose ) :

$ LIBGL_DEBUG=verbose glxinfo | grep libgl
libGL: pci id for fd 4: 1002:9498, driver r600
libGL: OpenDriver: trying /usr/lib/xorg/modules/dri/tls/r600_dri.so
libGL: OpenDriver: trying /usr/lib/xorg/modules/dri/r600_dri.so
ATTENTION: default value of option vblank_mode overridden by environment.
libGL: Using DRI3 for screen 0
    GLX_EXT_import_context, GLX_EXT_libglvnd, GLX_EXT_texture_from_pixmap,

so it seems that the problem could be located in xf86-video-ati driver, the DDX
xorg modesetting driver doesn't have this problem

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