Hello,
since I have updated my notebook to Ubuntu 11.04 (few days ago), I have noticed some problems like: in a certain period of time the section restarts automatically with no reason. When the section doesn't restart automatically, it gets “frozen” and it only stays normal again after a “forceboot” please, understand that a “forceboot” is that one in which I hold down the power button more than 3 seconds. And the most interesting thing I have ever seen was while playing a game that demands the usage of the X-Window, the scream changed  its color into green and some letters appeared vertically producing something like the “Matrix” effects. It also happens while using Classic Ubuntu or Classic Ubuntu (with no effects).
Please, note that I reinstalled Ubuntu 10.04 LTS and I didn't notice none of these problems again.

Thank you very much.

My notebook is an:
Intelbras i221
Intel Celeron Dual Core
2 GB RAM
160 GB HD

Another important information: (please remember that I typed it from my Ubuntu 10.04 LTS, otherwise I couldn't complete to post, because the section would restart before I finish it) =/

00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub (rev 03) 
	Subsystem: Elitegroup Computer Systems Device 903d 
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- 
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx- 
	Latency: 0 
	Capabilities: <access denied> 
	Kernel driver in use: agpgart-intel 
	Kernel modules: intel-agp 
00: 86 80 00 2a 06 01 90 20 03 00 00 06 00 00 00 00 
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
20: 00 00 00 00 00 00 00 00 00 00 00 00 19 10 3d 90 
30: 00 00 00 00 e0 00 00 00 00 00 00 00 00 00 00 00 

00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 03) 
	Subsystem: Elitegroup Computer Systems Device 903d 
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ 
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
	Latency: 0 
	Interrupt: pin A routed to IRQ 28 
	Region 0: Memory at f0000000 (64-bit, non-prefetchable) [size=1M] 
	Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M] 
	Region 4: I/O ports at 1800 [size=8] 
	Capabilities: <access denied> 
	Kernel driver in use: i915 
	Kernel modules: i915 
00: 86 80 02 2a 07 04 90 00 03 00 00 03 00 00 80 00 
10: 04 00 00 f0 00 00 00 00 0c 00 00 d0 00 00 00 00 
20: 01 18 00 00 00 00 00 00 00 00 00 00 19 10 3d 90 
30: 00 00 00 00 90 00 00 00 00 00 00 00 05 01 00 00 

00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 03) 
	Subsystem: Elitegroup Computer Systems Device 903d 
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- 
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
	Latency: 0 
	Region 0: Memory at f0100000 (64-bit, non-prefetchable) [size=1M] 
	Capabilities: <access denied> 
00: 86 80 03 2a 07 00 90 00 03 00 80 03 00 00 80 00 
10: 04 00 10 f0 00 00 00 00 00 00 00 00 00 00 00 00 
20: 00 00 00 00 00 00 00 00 00 00 00 00 19 10 3d 90 
30: 00 00 00 00 d0 00 00 00 00 00 00 00 00 00 00 00 

00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 (rev 04) 
	Subsystem: Elitegroup Computer Systems Device 90ac 
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- 
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
	Latency: 0 
	Interrupt: pin A routed to IRQ 16 
	Region 4: I/O ports at 1820 [size=32] 
	Kernel driver in use: uhci_hcd 
00: 86 80 34 28 05 00 80 02 04 00 03 0c 00 00 80 00 
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
20: 21 18 00 00 00 00 00 00 00 00 00 00 19 10 ac 90 
30: 00 00 00 00 00 00 00 00 00 00 00 00 05 01 00 00 

00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 04) 
	Subsystem: Elitegroup Computer Systems Device 90ac 
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- 
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
	Latency: 0 
	Interrupt: pin B routed to IRQ 21 
	Region 4: I/O ports at 1840 [size=32] 
	Kernel driver in use: uhci_hcd 
00: 86 80 35 28 05 00 80 02 04 00 03 0c 00 00 00 00 
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
20: 41 18 00 00 00 00 00 00 00 00 00 00 19 10 ac 90 
30: 00 00 00 00 00 00 00 00 00 00 00 00 0b 02 00 00 
 
00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 04) (prog-if 20) 
	Subsystem: Elitegroup Computer Systems Device 90ac 
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- 
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
	Latency: 0 
	Interrupt: pin C routed to IRQ 18 
	Region 0: Memory at f0504800 (32-bit, non-prefetchable) [size=1K] 
	Capabilities: <access denied> 
	Kernel driver in use: ehci_hcd 
00: 86 80 3a 28 06 01 90 02 04 20 03 0c 00 00 00 00 
10: 00 48 50 f0 00 00 00 00 00 00 00 00 00 00 00 00 
20: 00 00 00 00 00 00 00 00 00 00 00 00 19 10 ac 90 
30: 00 00 00 00 50 00 00 00 00 00 00 00 07 03 00 00 

00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 04) 
	Subsystem: Elitegroup Computer Systems Device 90ac 
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- 
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
	Latency: 0, Cache Line Size: 64 bytes 
	Interrupt: pin A routed to IRQ 22 
	Region 0: Memory at f0500000 (64-bit, non-prefetchable) [size=16K] 
	Capabilities: <access denied> 
	Kernel driver in use: HDA Intel 
	Kernel modules: snd-hda-intel 
00: 86 80 4b 28 06 01 10 00 04 00 03 04 10 00 00 00 
10: 04 00 50 f0 00 00 00 00 00 00 00 00 00 00 00 00 
20: 00 00 00 00 00 00 00 00 00 00 00 00 19 10 ac 90 
30: 00 00 00 00 50 00 00 00 00 00 00 00 0b 01 00 00 

00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 (rev 04) 
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ 
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
	Latency: 0, Cache Line Size: 64 bytes 
	Bus: primary=00, secondary=02, subordinate=02, sec-latency=0 
	I/O behind bridge: 00003000-00003fff 
	Memory behind bridge: 80000000-801fffff 
	Prefetchable memory behind bridge: 0000000080200000-00000000803fffff 
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR- 
	BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B- 
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- 
	Capabilities: <access denied> 
	Kernel driver in use: pcieport 
	Kernel modules: shpchp 
00: 86 80 3f 28 07 04 10 00 04 00 04 06 10 00 81 00 
10: 00 00 00 00 00 00 00 00 00 02 02 00 30 30 00 00 
20: 00 80 10 80 21 80 31 80 00 00 00 00 00 00 00 00 
30: 00 00 00 00 40 00 00 00 00 00 00 00 0a 01 04 00 

00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 2 (rev 04) 
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+ 
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
	Latency: 0, Cache Line Size: 64 bytes 
	Bus: primary=00, secondary=03, subordinate=03, sec-latency=0 
	I/O behind bridge: 00002000-00002fff 
	Memory behind bridge: f0200000-f02fffff 
	Prefetchable memory behind bridge: 0000000080400000-00000000805fffff 
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR- 
	BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B- 
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- 
	Capabilities: <access denied> 
	Kernel driver in use: pcieport 
	Kernel modules: shpchp 
00: 86 80 41 28 07 05 10 00 04 00 04 06 10 00 81 00 
10: 00 00 00 00 00 00 00 00 00 03 03 00 20 20 00 00 
20: 20 f0 20 f0 41 80 51 80 00 00 00 00 00 00 00 00 
30: 00 00 00 00 40 00 00 00 00 00 00 00 05 02 04 00 

00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 04) 
	Subsystem: Elitegroup Computer Systems Device 90ac 
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- 
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
	Latency: 0 
	Interrupt: pin A routed to IRQ 23 
	Region 4: I/O ports at 1860 [size=32] 
	Kernel driver in use: uhci_hcd 
00: 86 80 30 28 05 00 80 02 04 00 03 0c 00 00 80 00 
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
20: 61 18 00 00 00 00 00 00 00 00 00 00 19 10 ac 90 
30: 00 00 00 00 00 00 00 00 00 00 00 00 0a 01 00 00 

00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 04) 
	Subsystem: Elitegroup Computer Systems Device 90ac 
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- 
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
	Latency: 0 
	Interrupt: pin B routed to IRQ 19 
	Region 4: I/O ports at 1880 [size=32] 
	Kernel driver in use: uhci_hcd 
00: 86 80 31 28 05 00 80 02 04 00 03 0c 00 00 00 00 
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
20: 81 18 00 00 00 00 00 00 00 00 00 00 19 10 ac 90 
30: 00 00 00 00 00 00 00 00 00 00 00 00 0a 02 00 00 

00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 04) 
	Subsystem: Elitegroup Computer Systems Device 90ac 
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- 
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
	Latency: 0 
	Interrupt: pin C routed to IRQ 18 
	Region 4: I/O ports at 18a0 [size=32] 
	Kernel driver in use: uhci_hcd 
00: 86 80 32 28 05 00 80 02 04 00 03 0c 00 00 00 00 
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
20: a1 18 00 00 00 00 00 00 00 00 00 00 19 10 ac 90 
30: 00 00 00 00 00 00 00 00 00 00 00 00 07 03 00 00 

00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 04) (prog-if 20) 
	Subsystem: Elitegroup Computer Systems Device 90ac 
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- 
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
	Latency: 0 
	Interrupt: pin A routed to IRQ 23 
	Region 0: Memory at f0504c00 (32-bit, non-prefetchable) [size=1K] 
	Capabilities: <access denied> 
	Kernel driver in use: ehci_hcd 
00: 86 80 36 28 06 01 90 02 04 20 03 0c 00 00 00 00 
10: 00 4c 50 f0 00 00 00 00 00 00 00 00 00 00 00 00 
20: 00 00 00 00 00 00 00 00 00 00 00 00 19 10 ac 90 
30: 00 00 00 00 50 00 00 00 00 00 00 00 0a 01 00 00 

00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f4) (prog-if 01) 
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- 
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
	Latency: 0 
	Bus: primary=00, secondary=04, subordinate=04, sec-latency=32 
	Secondary status: 66MHz- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ <SERR- <PERR- 
	BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B- 
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- 
	Capabilities: <access denied> 
00: 86 80 48 24 07 01 10 00 f4 01 04 06 00 00 01 00 
10: 00 00 00 00 00 00 00 00 00 04 04 20 f0 00 80 22 
20: f0 ff 00 00 f1 ff 01 00 00 00 00 00 00 00 00 00 
30: 00 00 00 00 50 00 00 00 00 00 00 00 ff 00 04 00 

00:1f.0 ISA bridge: Intel Corporation 82801HEM (ICH8M) LPC Interface Controller (rev 04) 
	Subsystem: Elitegroup Computer Systems Device 90ac 
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- 
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
	Latency: 0 
	Capabilities: <access denied> 
	Kernel modules: iTCO_wdt 
00: 86 80 15 28 07 01 10 02 04 00 01 06 00 00 80 00 
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
20: 00 00 00 00 00 00 00 00 00 00 00 00 19 10 ac 90 
30: 00 00 00 00 e0 00 00 00 00 00 00 00 00 00 00 00 

00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) IDE Controller (rev 04) (prog-if 8a [Master SecP PriP]) 
	Subsystem: Elitegroup Computer Systems Device 90ac 
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- 
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
	Latency: 0 
	Interrupt: pin A routed to IRQ 19 
	Region 0: I/O ports at 01f0 [size=8] 
	Region 1: I/O ports at 03f4 [size=1] 
	Region 2: I/O ports at 0170 [size=8] 
	Region 3: I/O ports at 0374 [size=1] 
	Region 4: I/O ports at 1810 [size=16] 
	Kernel driver in use: ata_piix 
00: 86 80 50 28 05 00 80 02 04 8a 01 01 00 00 00 00 
10: 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00 
20: 11 18 00 00 00 00 00 00 00 00 00 00 19 10 ac 90 
30: 00 00 00 00 00 00 00 00 00 00 00 00 ff 01 00 00 

00:1f.2 SATA controller: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA AHCI Controller (rev 04) (prog-if 01) 
	Subsystem: Elitegroup Computer Systems Device 90ac 
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ 
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
	Latency: 0 
	Interrupt: pin B routed to IRQ 27 
	Region 0: I/O ports at 1c00 [size=8] 
	Region 1: I/O ports at 18d4 [size=4] 
	Region 2: I/O ports at 18d8 [size=8] 
	Region 3: I/O ports at 18d0 [size=4] 
	Region 4: I/O ports at 18e0 [size=32] 
	Region 5: Memory at f0504000 (32-bit, non-prefetchable) [size=2K] 
	Capabilities: <access denied> 
	Kernel driver in use: ahci 
	Kernel modules: ahci 
00: 86 80 29 28 07 04 b0 02 04 01 06 01 00 00 00 00 
10: 01 1c 00 00 d5 18 00 00 d9 18 00 00 d1 18 00 00 
20: e1 18 00 00 00 40 50 f0 00 00 00 00 19 10 ac 90 
30: 00 00 00 00 80 00 00 00 00 00 00 00 0a 02 00 00 

00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 04) 
	Subsystem: Elitegroup Computer Systems Device 90ac 
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- 
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- 
	Interrupt: pin C routed to IRQ 10 
	Region 0: Memory at 80600000 (32-bit, non-prefetchable) [size=256] 
	Region 4: I/O ports at 1c20 [size=32] 
	Kernel modules: i2c-i801 
00: 86 80 3e 28 03 01 80 02 04 00 05 0c 00 00 00 00 
10: 00 00 60 80 00 00 00 00 00 00 00 00 00 00 00 00 
20: 21 1c 00 00 00 00 00 00 00 00 00 00 19 10 ac 90 
30: 00 00 00 00 00 00 00 00 00 00 00 00 0a 03 00 00 

03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 01) 
	Subsystem: Elitegroup Computer Systems Device 90ac 
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+ 
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR+ <PERR- INTx- 
	Latency: 0, Cache Line Size: 64 bytes 
	Interrupt: pin A routed to IRQ 26 
	Region 0: I/O ports at 2000 [size=256] 
	Region 2: Memory at f0200000 (64-bit, non-prefetchable) [size=4K] 
	[virtual] Expansion ROM at 80400000 [disabled] [size=128K] 
	Capabilities: <access denied> 
	Kernel driver in use: r8169 
	Kernel modules: r8169 
00: ec 10 36 81 07 05 10 40 01 00 00 02 10 00 00 00 
10: 01 20 00 00 00 00 00 00 04 00 20 f0 00 00 00 00 
20: 00 00 00 00 00 00 00 00 00 00 00 00 19 10 ac 90 
30: 00 00 00 00 40 00 00 00 00 00 00 00 0a 01 00 00