I have made some investigations, and I have almost found the bug. * The X server has chosen a format with 24 bit depth and 24 bits_per_pixel, which seems pretty unusual.
(source is qt/src/gui/image/qnativeimage.cpp) * QNativeImage::format() returns either 16 or 32 bits, but never 24! -> This is the cause of the garbage in the display. * QNativeImage::QNativeImage is called with the 32bit format, and allocates a Ximage (using XShmCreateImage) of the default (-> 24). * Result : QImage thinks we've 4 bytes per pixel, XImage 3 bytes per pixel and this is the source of the segfault. I have tried hacking QNativeImage::format() to return QImage::Format_RGB888, there is no more segfault, but the red and blue channels are inverted. Hope this helps. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-cirrus in Ubuntu. https://bugs.launchpad.net/bugs/759803 Title: Unity-2d not working on KVM with xen and cirrus video devices To manage notifications about this bug go to: https://bugs.launchpad.net/unity-2d/+bug/759803/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
