Thanks for your help. It took me a while
as this problem is kind of erratic and does not always happen.
Here is the output of my lspci -vvnn and I attach the /var/log/Xorg.0.log file

[EMAIL PROTECTED]:~$ lspci -vvnn
00:00.0 Host bridge [0600]: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML 
and 945GT Express Memory Controller Hub [8086:27a0] (rev 03)
        Subsystem: Toshiba America Info Systems Unknown device [1179:0001]
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort+ >SERR- <PERR-
        Latency: 0
        Capabilities: <access denied>

00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 945GM/GMS, 
943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03) (prog-if 
00 [VGA controller])
        Subsystem: Toshiba America Info Systems Unknown device [1179:0001]
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 0
        Interrupt: pin A routed to IRQ 10
        Region 0: Memory at ffd80000 (32-bit, non-prefetchable) [size=512K]
        Region 1: I/O ports at cff8 [size=8]
        Region 2: Memory at e0000000 (32-bit, prefetchable) [size=256M]
        Region 3: Memory at ffd40000 (32-bit, non-prefetchable) [size=256K]
        Capabilities: <access denied>

00:02.1 Display controller [0380]: Intel Corporation Mobile 945GM/GMS/GME, 
943/940GML Express Integrated Graphics Controller [8086:27a6] (rev 03)
        Subsystem: Toshiba America Info Systems Unknown device [1179:0001]
        Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Region 0: Memory at 88000000 (32-bit, non-prefetchable) [disabled] 
[size=512K]
        Capabilities: <access denied>

00:1b.0 Audio device [0403]: Intel Corporation 82801G (ICH7 Family) High 
Definition Audio Controller [8086:27d8] (rev 02)
        Subsystem: Toshiba America Info Systems Unknown device [1179:0001]
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 0, Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 23
        Region 0: Memory at 88080000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>

00:1c.0 PCI bridge [0604]: Intel Corporation 82801G (ICH7 Family) PCI Express 
Port 1 [8086:27d0] (rev 02) (prog-if 00 [Normal decode])
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 0, Cache Line Size: 32 bytes
        Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
        I/O behind bridge: 0000b000-0000bfff
        Memory behind bridge: ffc00000-ffcfffff
        Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- <SERR- <PERR-
        BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
        Capabilities: <access denied>

00:1c.2 PCI bridge [0604]: Intel Corporation 82801G (ICH7 Family) PCI Express 
Port 3 [8086:27d4] (rev 02) (prog-if 00 [Normal decode])
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 0, Cache Line Size: 32 bytes
        Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
        Memory behind bridge: ffa00000-ffafffff
        Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort+ <SERR- <PERR-
        BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
        Capabilities: <access denied>

00:1d.0 USB Controller [0c03]: Intel Corporation 82801G (ICH7 Family) USB UHCI 
Controller #1 [8086:27c8] (rev 02) (prog-if 00 [UHCI])
        Subsystem: Toshiba America Info Systems Unknown device [1179:0001]
        Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B-
        Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR-
        Latency: 0
        Interrupt: pin A routed to IRQ 20
        Region 4: I/O ports at afe0 [size=32]


** Attachment added: "alobo_Xorg.0.log"
   http://launchpadlibrarian.net/19667989/alobo_Xorg.0.log

-- 
icons unexpectly disappears from desktop in gnome
https://bugs.launchpad.net/bugs/175534
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