Hi.
Today, after the umpteenth freeze-from-sleeping (suspended system) and force-shutdown (by pressing the power button for 5 secs) and reboot of my system (11.10), the display resolution had changed from the usual 1024x600 (16.9) to 800x600 (4:3). When I checked System Info I found out that the graphic device was somehow listed as a different one: it is usually 'Unknown', while after that reboot it was an Intel Vesa 'something'...I forgot the exact description and I did not take a screenshot. (sorry).

My hardware:
Code:
computer                  
    description: Notebook
    version: Not Applicable
    width: 32 bits
    capabilities: smbios-2.5 dmi-2.5 smp-1.4 smp
    configuration: administrator_password=disabled boot=normal chassis=notebook cpus=1 family=1234567890 frontpanel_password=unknown keyboard_password=unknown power-on_password=disabled sku=1234567890 uuid=[REMOVED]
  *-core
       description: Motherboard
       product: N150/N210/N220
       vendor: SAMSUNG ELECTRONICS CO., LTD.
       physical id: 0
       version: Not Applicable
       serial: [REMOVED]
     *-firmware
          description: BIOS
          vendor: Phoenix Technologies Ltd.
          physical id: 0
          version: 08JI.M073.20100325.JIP
          date: 03/25/2010
          size: 103KiB
          capacity: 1984KiB
          capabilities: isa pci pnp upgrade shadowing escd cdboot bootselect socketedrom edd int5printscreen int9keyboard int14serial int17printer int10video usb smartbattery biosbootspecification
     *-cpu
          description: CPU
          product: Intel(R) Atom(TM) CPU N450   @ 1.66GHz
          vendor: Intel Corp.
          physical id: 4
          bus info: cpu@0
          version: 6.12.10
          serial: [REMOVED]
          slot: CPU 1
          size: 1GHz
          capacity: 3300MHz
          width: 64 bits
          capabilities: x86-64 boot fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm movbe lahf_lm cpufreq
          configuration: cores=1 enabledcores=1 id=1 threads=2
        *-cache:0
             description: L1 cache
             physical id: 5
             slot: L1 Cache
             size: 16KiB
             capacity: 16KiB
             capabilities: asynchronous internal write-back
        *-cache:1
             description: L2 cache
             physical id: 6
             slot: L2 Cache
             size: 512KiB
             capacity: 512KiB
             capabilities: burst internal write-back
        *-logicalcpu:0
             description: Logical CPU
             physical id: 1.1
             width: 64 bits
             capabilities: logical
        *-logicalcpu:1
             description: Logical CPU
             physical id: 1.2
             width: 64 bits
             capabilities: logical
     *-memory
          description: System Memory
          physical id: e
          slot: System board or motherboard
          size: 2GiB
        *-bank
             description: SODIMM DDR2 Synchronous 667 MHz (1.5 ns)
             product: 012345678901234567890123456789012345
             vendor: 48spaces
             physical id: 0
             serial: [REMOVED]
             slot: J6G1
             size: 2GiB
             width: 64 bits
             clock: 667MHz (1.5ns)
     *-pci
          description: Host bridge
          product: N10 Family DMI Bridge
          vendor: Intel Corporation
          physical id: 100
          bus info: pci@0000:00:00.0
          version: 00
          width: 32 bits
          clock: 33MHz
          configuration: driver=agpgart-intel
          resources: irq:0
        *-display:0
             description: VGA compatible controller
             product: N10 Family Integrated Graphics Controller
             vendor: Intel Corporation
             physical id: 2
             bus info: pci@0000:00:02.0
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: msi pm vga_controller bus_master cap_list rom
             configuration: driver=i915 latency=0
             resources: irq:46 memory:f0300000-f037ffff ioport:18d0(size=8) memory:d0000000-dfffffff memory:f0000000-f00fffff
        *-display:1 UNCLAIMED
             description: Display controller
             product: N10 Family Integrated Graphics Controller
             vendor: Intel Corporation
             physical id: 2.1
             bus info: pci@0000:00:02.1
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: pm bus_master cap_list
             configuration: latency=0
             resources: memory:f0380000-f03fffff
        *-multimedia
             description: Audio device
             product: N10/ICH 7 Family High Definition Audio Controller
             vendor: Intel Corporation
             physical id: 1b
             bus info: pci@0000:00:1b.0
             version: 02
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi pciexpress bus_master cap_list
             configuration: driver=HDA Intel latency=0
             resources: irq:47 memory:f0400000-f0403fff
        *-pci:0
             description: PCI bridge
             product: N10/ICH 7 Family PCI Express Port 1
             vendor: Intel Corporation
             physical id: 1c
             bus info: pci@0000:00:1c.0
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:40 ioport:5000(size=4096) memory:f0100000-f01fffff ioport:80a00000(size=2097152)
           *-network
                description: Wireless interface
                product: AR9285 Wireless Network Adapter (PCI-Express)
                vendor: Atheros Communications Inc.
                physical id: 0
                bus info: pci@0000:05:00.0
                logical name: wlan0
                version: 01
                serial: [REMOVED]
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
                configuration: broadcast=yes driver=ath9k driverversion=3.0.0-17-generic firmware=N/A ip=[REMOVED] latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
                resources: irq:16 memory:f0100000-f010ffff
        *-pci:1
             description: PCI bridge
             product: N10/ICH 7 Family PCI Express Port 2
             vendor: Intel Corporation
             physical id: 1c.1
             bus info: pci@0000:00:1c.1
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:41 ioport:4000(size=4096) memory:80600000-807fffff ioport:80800000(size=2097152)
        *-pci:2
             description: PCI bridge
             product: N10/ICH 7 Family PCI Express Port 3
             vendor: Intel Corporation
             physical id: 1c.2
             bus info: pci@0000:00:1c.2
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:42 ioport:2000(size=4096) memory:f0200000-f02fffff ioport:80400000(size=2097152)
           *-network
                description: Ethernet interface
                product: 88E8040 PCI-E Fast Ethernet Controller
                vendor: Marvell Technology Group Ltd.
                physical id: 0
                bus info: pci@0000:09:00.0
                logical name: eth0
                version: 00
                serial: [REMOVED]
                capacity: 100Mbit/s
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation
                configuration: autonegotiation=on broadcast=yes driver=sky2 driverversion=1.28 firmware=N/A latency=0 link=no multicast=yes port=twisted pair
                resources: irq:44 memory:f0200000-f0203fff ioport:2000(size=256)
        *-pci:3
             description: PCI bridge
             product: N10/ICH 7 Family PCI Express Port 4
             vendor: Intel Corporation
             physical id: 1c.3
             bus info: pci@0000:00:1c.3
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:43 ioport:3000(size=4096) memory:80000000-801fffff ioport:80200000(size=2097152)
        *-usb:0
             description: USB Controller
             product: N10/ICH 7 Family USB UHCI Controller #1
             vendor: Intel Corporation
             physical id: 1d
             bus info: pci@0000:00:1d.0
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master
             configuration: driver=uhci_hcd latency=0
             resources: irq:23 ioport:1820(size=32)
        *-usb:1
             description: USB Controller
             product: N10/ICH 7 Family USB UHCI Controller #2
             vendor: Intel Corporation
             physical id: 1d.1
             bus info: pci@0000:00:1d.1
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master
             configuration: driver=uhci_hcd latency=0
             resources: irq:19 ioport:1840(size=32)
        *-usb:2
             description: USB Controller
             product: N10/ICH 7 Family USB UHCI Controller #3
             vendor: Intel Corporation
             physical id: 1d.2
             bus info: pci@0000:00:1d.2
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master
             configuration: driver=uhci_hcd latency=0
             resources: irq:18 ioport:1860(size=32)
        *-usb:3
             description: USB Controller
             product: N10/ICH 7 Family USB UHCI Controller #4
             vendor: Intel Corporation
             physical id: 1d.3
             bus info: pci@0000:00:1d.3
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master
             configuration: driver=uhci_hcd latency=0
             resources: irq:16 ioport:1880(size=32)
        *-usb:4
             description: USB Controller
             product: N10/ICH 7 Family USB2 EHCI Controller
             vendor: Intel Corporation
             physical id: 1d.7
             bus info: pci@0000:00:1d.7
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: pm debug ehci bus_master cap_list
             configuration: driver=ehci_hcd latency=0
             resources: irq:23 memory:f0604000-f06043ff
        *-pci:4
             description: PCI bridge
             product: 82801 Mobile PCI Bridge
             vendor: Intel Corporation
             physical id: 1e
             bus info: pci@0000:00:1e.0
             version: e2
             width: 32 bits
             clock: 33MHz
             capabilities: pci subtractive_decode bus_master cap_list
        *-isa
             description: ISA bridge
             product: NM10 Family LPC Controller
             vendor: Intel Corporation
             physical id: 1f
             bus info: pci@0000:00:1f.0
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: isa bus_master cap_list
             configuration: latency=0
        *-storage
             description: SATA controller
             product: N10/ICH7 Family SATA AHCI Controller
             vendor: Intel Corporation
             physical id: 1f.2
             bus info: pci@0000:00:1f.2
             logical name: scsi0
             version: 02
             width: 32 bits
             clock: 66MHz
             capabilities: storage msi pm ahci_1.0 bus_master cap_list emulated
             configuration: driver=ahci latency=0
             resources: irq:45 ioport:18e8(size=8) ioport:18dc(size=4) ioport:18e0(size=8) ioport:18d8(size=4) ioport:18c0(size=16) memory:f0604400-f06047ff
           *-disk
                description: ATA Disk
                product: SAMSUNG HM250HI
                physical id: 0.0.0
                bus info: scsi@0:0.0.0
                logical name: /dev/sda
                version: 2AC1
                serial: [REMOVED]
                size: 232GiB (250GB)
                capabilities: partitioned partitioned:dos
                configuration: ansiversion=5 signature=9d97ba08
              *-volume:0
                   description: Windows NTFS volume
                   physical id: 1
                   bus info: scsi@0:0.0.0,1
                   logical name: /dev/sda1
                   version: 3.1
                   serial: [REMOVED]
                   size: 14GiB
                   capacity: 15GiB
                   capabilities: primary ntfs initialized
                   configuration: clustersize=4096 created=2009-12-10 18:03:43 filesystem=ntfs label=RECOVERY state=clean
              *-volume:1
                   description: Windows NTFS volume
                   physical id: 2
                   bus info: scsi@0:0.0.0,2
                   logical name: /dev/sda2
                   version: 3.1
                   serial: [REMOVED]
                   size: 98MiB
                   capacity: 100MiB
                   capabilities: primary bootable ntfs initialized
                   configuration: clustersize=4096 created=2009-12-10 18:03:47 filesystem=ntfs label=SYSTEM state=clean
              *-volume:2
                   description: Windows NTFS volume
                   physical id: 3
                   bus info: scsi@0:0.0.0,3
                   logical name: /dev/sda3
                   version: 3.1
                   serial: [REMOVED]
                   size: 100GiB
                   capacity: 100GiB
                   capabilities: primary ntfs initialized
                   configuration: clustersize=4096 created=2009-12-10 18:03:48 filesystem=ntfs state=clean
              *-volume:3
                   description: Extended partition
                   physical id: 4
                   bus info: scsi@0:0.0.0,4
                   logical name: /dev/sda4
                   size: 117GiB
                   capacity: 117GiB
                   capabilities: primary extended partitioned partitioned:extended
                 *-logicalvolume:0
                      description: Linux filesystem partition
                      physical id: 5
                      logical name: /dev/sda5
                      logical name: /
                      capacity: 27GiB
                      configuration: mount.fstype=ext4 mount.options=rw,relatime,errors=remount-ro,user_xattr,acl,barrier=1,data=ordered state=mounted
                 *-logicalvolume:1
                      description: Linux filesystem partition
                      physical id: 6
                      logical name: /dev/sda6
                      logical name: /home
                      capacity: 87GiB
                      configuration: mount.fstype=ext4 mount.options=rw,relatime,user_xattr,acl,barrier=1,data=ordered state=mounted
                 *-logicalvolume:2
                      description: Linux swap / Solaris partition
                      physical id: 7
                      logical name: /dev/sda7
                      capacity: 1952MiB
                      capabilities: nofs
        *-serial UNCLAIMED
             description: SMBus
             product: N10/ICH 7 Family SMBus Controller
             vendor: Intel Corporation
             physical id: 1f.3
             bus info: pci@0000:00:1f.3
             version: 02
             width: 32 bits
             clock: 33MHz
             configuration: latency=0
             resources: ioport:18a0(size=32)
  *-remoteaccess UNCLAIMED
       vendor: Intel
       physical id: 1
       capabilities: inbound
Any logs that could help to figure out what has happened? xorg.0? xorg.1? syslog?

Thank you