Xephyr crash on Ubuntu Maverick guest

[scifi.guy]

I am trying to use Xephyr on Ubuntu Maverick guest with guest additions installed. When I start Xephyr, it crashes with this error.

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user@ubuntu:~$ Xephyr :2 -host-cursor -screen 800x480x16 -dpi 96 -ac -keybd ephyr,,,xkbmodel=evdev &
[1] 8640
user@ubuntu:~$ Xephyr: ../../../../include/privates.h:122: dixGetPrivateAddr: Assertion `key->initialized' failed.

This issue started after upgrading the Ubuntu guest to Maverick. There are couple of bug reports filed in Ubuntu for this issue, but this seems to be related to guest additions only. Xephyr works fine if I uninstall guest additions, but I like the convenience of guest additions .

Bug report from Ubuntu --> https://bugs.launchpad.net/ubuntu/+sour ... bug/625321

I am using Virtualbox 3.2.12 on Windows 7 host. Any thoughts on how can I fix this issue?

[Perryg]

The guest additions open up X11 to accelerated graphics. I see from the bug report that even native they are having issues. I see no reason why it would not have issues virtualized. The reason you do not see the issue when the guest additions are not installed is there is no acceleration. Try turning off 3D/2D acceleration in the guest settings and see if that will allow you to continue until they get the bug fixed.

Also you stated in the bug report there that you are using an Intel 945GM GPU which is know to have issues in a Virtual Environment. Make sure that you have the latest and greatest updates for this device.

[scifi.guy]

@Perryg - Thanks for the reply. Actually I did not file that bug report. In my case, I am using ATI Mobility Radeon HD 4650 graphics card.

3D/2D acceleration settings were already turned off. I tried enabling/disabling them again and bumped up the video memory to 128 MB, still no luck with xephyr. My guest OS is up to date.

If I boot to Ubuntu Maverick 64bit natively, xephyr works fine. Anything else I should try?

[burns]

Having the same issue as @Peeryg once I install Guest Additions.

Using Fedora 14 guest with ATI Radeon HD 4300/4500 Series graphics card. Driver up-to-date.

[scifi.guy]

I finally got Xephyr to work by changing the command to

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Xephyr :2 -host-cursor -screen 800x480x16 -dpi 96 -ac -kb &