This is also true for kernel-image-std-def-2.6.32-alt20.M50P.1 .

+++ This bug was initially created as a clone of Bug #23703 +++

Created an attachment (id=4442)
(lspci crashed, but otherwise a sysreport)

kernel-image-std-def-2.6.32-alt15
kernel-modules-drm-std-def-2.6.32-alt15
xorg-dri-intel-7.0.4-alt9.M41.1
xorg-drv-intel-2.4.3-alt0.M41.1
xorg-server-1.4.2-alt10.M41.1

The system boots in some framebuffer mode on the text linux consoles, then X (and KDE) starts, and after that switching to any linux console makes the screen blank. Switching back to the console with X (no. 7) doesn't help. If I start another X, it is shown correctly on the screen, but switching from the second X (even to the first X) doesn't work correctly: the screen is again blank.

I have just upgraded the kernel from kernel-image-std-def-2.6.30-alt14 ; on that kernel this X worked well (= with no crashes or other big problems).

Workaround: never switch to other linux consoles from X.

More info about the system is attached, and:

# lspci 
00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 02)
00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 02)
00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 02)
02:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG Network Connection (rev 02)
06:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8055 PCI-E Gigabit Ethernet Controller (rev 12)
07:04.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev ba)
07:04.4 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 11)
# lsmod | fgrep i9
i915                  296328  1 
drm_kms_helper         26900  1 i915
drm                   153273  2 i915,drm_kms_helper
i2c_algo_bit            4748  1 i915
button                  4546  1 i915
video                  16050  1 i915
i2c_core               20148  5 videodev,i915,drm,i2c_algo_bit,i2c_i801
#