I installed Current (Feb. 28) in VirtualBox. The install went fine.
I can boot into Xfce and Fluxbox with the startx command. KDE bombs, somewhere just after the fourth icon of the startup display.
In my first attempt I installed the VB guest additions. I figured that might be the problem. I wiped the virtual machine and tried again. In my second attempt I did not immediately install the guest additions. Same result.
I copied xorg.conf-vesa to xorg.conf. No help, same result as with no xorg.conf. I am not booting the system with any framebuffer, just normal vga. Without the VB guest additions, the system is at 800x600 resolution.
Because of the tiny screen, I cannot read all of the error messages. The scrollback buffer is to small to read all of the messages. Some of the messages make no sense to me. For example, there is a message that plasma-desktop cannot find the dbus session server. Yet rc.messagebus is enabled and running, and a file in ~/.kde/dbus/session-bus exists. I see messages about fatal errors with references to *.cpp files at /tmp/kde-4.5.5.
The Xorg.0.log says there was a segmentation fault at address (nil), but there are no (EE) errors in the log. There is no xsession-error log.
I started xfce. From there installed the VB guest additions. Rebooted. No framebuffer (vga=normal). I was able to run Xfce and fluxbox in a nice 1664x929 display resolution. Mouse and keyboard worked transparently. I edited lilo.conf for vga=791 to enlarge the console screen size.
I rebooted, tested X again, then exited. I changed to KDE. Same results. Bomb.
This time I saw two (EE) error messages in Xorg.0.log regarding vboxvideo and disabling DRI.
Here is part of the xorg log:
[ 533.067] (EE) [drm] drmOpen failed.
[ 533.067] (EE) VBoxVideo(0): DRIScreenInit failed, disabling DRI.
[ 533.067] (II) VBoxVideo(0): visual configurations initialized
[ 533.068] (==) VBoxVideo(0): Backing store disabled
[ 533.068] (II) VBoxVideo(0): RandR 1.2 enabled, ignore the following RandR disabled message.
[ 533.071] (==) VBoxVideo(0): DPMS enabled
[ 533.073] (II) VBoxVideo(0): The VBox video extensions are now enabled.
[ 533.073] (--) RandR disabled
[ 543.133] 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80e72fb]
[ 543.133] 1: /usr/bin/X (0x8048000+0x5dbf5) [0x80a5bf5]
[ 543.133] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xffffe40c]
[ 543.133] 3: /usr/lib/xorg/modules/libfb.so (fbBlt+0xbe) [0xb72c392e]
[ 543.134] 4: /usr/lib/xorg/modules/libfb.so (fbBltStip+0x73) [0xb72c46d3]
[ 543.134] 5: /usr/lib/xorg/modules/libfb.so (fbGetImage+0x199) [0xb72c9a39]
[ 543.134] 6: /usr/bin/X (0x8048000+0x15f0af) [0x81a70af]
[ 543.134] 7: /usr/lib/xorg/modules/extensions/libglx.so (0xb74c0000+0x37d5b) [0xb74f7d5b]
[ 543.134] 8: /usr/lib/xorg/modules/dri/swrast_dri.so (0xb4bfc000+0x10a5d) [0xb4c0ca5d]
[ 543.134] 9: /usr/lib/xorg/modules/dri/swrast_dri.so (0xb4bfc000+0x10aa7) [0xb4c0caa7]
[ 543.134] 10: /usr/lib/xorg/modules/extensions/libglx.so (0xb74c0000+0x37cbd) [0xb74f7cbd]
[ 543.135] 11: /usr/lib/xorg/modules/extensions/libglx.so (0xb74c0000+0x34412) [0xb74f4412]
[ 543.135] 12: /usr/lib/xorg/modules/extensions/libglx.so (0xb74c0000+0x3528a) [0xb74f528a]
[ 543.135] 13: /usr/lib/xorg/modules/extensions/libglx.so (0xb74c0000+0x3727f) [0xb74f727f]
[ 543.135] 14: /usr/bin/X (0x8048000+0x27e87) [0x806fe87]
[ 543.135] 15: /usr/bin/X (0x8048000+0x1aec5) [0x8062ec5]
[ 543.135] 16: /lib/libc.so.6 (__libc_start_main+0xe6) [0xb7560db6]
[ 543.137] 17: /usr/bin/X (0x8048000+0x1aaa1) [0x8062aa1]
[ 543.137] Segmentation fault at address (nil)
Fatal server error:
[ 543.138] Caught signal 11 (Segmentation fault). Server aborting
I see some old threads about mesa, but after these many months I doubt they still apply.
Otherwise I have had no other problems in VB.