This bug also happens to me. I am attaching my Xorg.0.log here. The log 
includes log entries after four Ctrl+Alt+F<n> strokes (n = 1..6). Stroke #1 is 
the first attempt to switch to a VC (virtual console).  It failed in the 
following way: the corresponding virtual console (VC) appeared for a split 
second, but then the X screen reappeared. If this happens, retrying it (stroke 
#2) immediately always succeeded.
Stroke #3 also failed: it took place several minutes apart (I have no idea 
about the exact time interval) from the strokes #1 and #2. Stroke #4, a retry 
of stroke #3, also succeeded. In brief, after one failure, other following 
attempts would succeeded if they are closely spaced. But then if we don't 
switch to any VC for a period of time (maybe several minutes), then attempting 
to switch to one of the VCs would "fail" as I descibed above.

I am using Xubuntu 8.10 with the following package versions:

xorg version 1:7.4~5ubuntu3
linux kernel: linux-image-2.6.27-10-generic , version 2.6.27-10.20

The hardware is Dell Lattitude D600 with the following peripheral:

~ $ lspci 
00:00.0 Host bridge: Intel Corporation 82855PM Processor to I/O Controller (rev 
03)
00:01.0 PCI bridge: Intel Corporation 82855PM Processor to AGP Controller (rev 
03)
00:1d.0 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) 
USB UHCI Controller #1 (rev 01)
00:1d.1 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) 
USB UHCI Controller #2 (rev 01)
00:1d.2 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) 
USB UHCI Controller #3 (rev 01)
00:1d.7 USB Controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2 EHCI 
Controller (rev 01)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 81)
00:1f.0 ISA bridge: Intel Corporation 82801DBM (ICH4-M) LPC Interface Bridge 
(rev 01)
00:1f.1 IDE interface: Intel Corporation 82801DBM (ICH4-M) IDE Controller (rev 
01)
00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM 
(ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 01)
00:1f.6 Modem: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 
Modem Controller (rev 01)
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon RV250 [Mobility 
FireGL 9000] (rev 02)
02:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5705M Gigabit 
Ethernet (rev 03)
02:01.0 CardBus bridge: O2 Micro, Inc. OZ711EC1 SmartCardBus Controller (rev 20)
02:01.1 CardBus bridge: O2 Micro, Inc. OZ711EC1 SmartCardBus Controller (rev 20)
02:03.0 Network controller: Intel Corporation PRO/Wireless 2200BG [Calexico2] 
Network Connection (rev 05)

The X driver used is the open-source ATI driver in the xorg package.

The following bug has Ctrl+Alt+F<n> as a workaround, but the secondary
bug with the virtual console described here adds even more inconvenience
to the use of LInux on Dell laptops:

https://bugs.launchpad.net/ubuntu/intrepid/+source/linux/+bug/285323

Wirawan

** Attachment added: "Xorg.0.log"
   http://launchpadlibrarian.net/20787549/Xorg.0.log

-- 
switch user or switch to console failes on first try in intrepid
https://bugs.launchpad.net/bugs/290067
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