Every night when I leave work, I lock the screen via ubuntu's "power" button in the top right hand panel.

When I come to work in the morning, I'm greeted with the log-in screen. This doesn't happen every night, but most.

I'm running ubuntu 10.04 on a Dell inspiron. I've included some HW specs, and also dmesg output. Please let me know what other logs may be useful.

thanks! Corey

~$ dmesg 
[20559.696062] type=1503 audit(1285957687.048:16):  operation="open" pid=6212 parent=1 profile="/usr/bin/evince" requested_mask="::r" denied_mask="::r" fsuid=1000 ouid=0 name="/usr/local/lib/libltdl.so.7.2.2"
[21127.951621] type=1503 audit(1285958255.300:17):  operation="open" pid=6390 parent=1 profile="/usr/bin/evince" requested_mask="::r" denied_mask="::r" fsuid=1000 ouid=0 name="/usr/local/lib/libltdl.so.7.2.2"
[291038.528014] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
[291038.528025] render error detected, EIR: 0x00000000
[291038.528042] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 22973891 at 22973890)
[291038.828014] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
[291038.828023] render error detected, EIR: 0x00000000
[291038.828042] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 22973894 at 22973890)


~$ lspci -vv                                                                                                                           
00:00.0 Host bridge: Intel Corporation 4 Series Chipset DRAM Controller (rev 03)
    Subsystem: Dell Device 02e1
    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

00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset Integrated Graphics Controller (rev 03)
    Subsystem: Dell Device 02e1
    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 27
    Region 0: Memory at fe400000 (64-bit, non-prefetchable) [size=4M]
    Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M]
    Region 4: I/O ports at dc00 [size=8]
    Capabilities: <access denied>
    Kernel driver in use: i915
    Kernel modules: i915

00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 01)
    Subsystem: Dell Device 02e1
    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: 32 bytes
    Interrupt: pin A routed to IRQ 16
    Region 0: Memory at feaf8000 (64-bit, non-prefetchable) [size=16K]
    Capabilities: <access denied>
    Kernel driver in use: HDA Intel
    Kernel modules: snd-hda-intel

00:1c.0 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 1 (rev 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, Cache Line Size: 32 bytes
    Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
    I/O behind bridge: 00001000-00001fff
    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

00:1c.1 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 2 (rev 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, Cache Line Size: 32 bytes
    Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
    I/O behind bridge: 0000e000-0000efff
    Memory behind bridge: feb00000-febfffff
    Prefetchable memory behind bridge: 00000000fdf00000-00000000fdffffff
    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

00:1d.0 USB Controller: Intel Corporation N10/ICH7 Family USB UHCI Controller #1 (rev 01)
    Subsystem: Dell Device 02e1
    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 d880 [size=32]
    Kernel driver in use: uhci_hcd

00:1d.1 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #2 (rev 01)
    Subsystem: Dell Device 02e1
    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 d800 [size=32]
    Kernel driver in use: uhci_hcd

00:1d.2 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #3 (rev 01)
    Subsystem: Dell Device 02e1
    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 d480 [size=32]
    Kernel driver in use: uhci_hcd

00:1d.3 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #4 (rev 01)
    Subsystem: Dell Device 02e1
    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 D routed to IRQ 16
    Region 4: I/O ports at d400 [size=32]
    Kernel driver in use: uhci_hcd

00:1d.7 USB Controller: Intel Corporation N10/ICH 7 Family USB2 EHCI Controller (rev 01) (prog-if 20)
    Subsystem: Dell Device 02e1
    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 feaf7c00 (32-bit, non-prefetchable) [size=1K]
    Capabilities: <access denied>
    Kernel driver in use: ehci_hcd

00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1) (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=03, subordinate=03, 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>

00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01)
    Subsystem: Dell Device 02e1
    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, intel-rng

00:1f.2 IDE interface: Intel Corporation N10/ICH7 Family SATA IDE Controller (rev 01) (prog-if 8f [Master SecP SecO PriP PriO])
    Subsystem: Dell Device 02e1
    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 0: I/O ports at d080 [size=8]
    Region 1: I/O ports at d000 [size=4]
    Region 2: I/O ports at cc00 [size=8]
    Region 3: I/O ports at c880 [size=4]
    Region 4: I/O ports at c800 [size=16]
    Capabilities: <access denied>
    Kernel driver in use: ata_piix

00:1f.3 SMBus: Intel Corporation N10/ICH 7 Family SMBus Controller (rev 01)
    Subsystem: Dell Device 02e1
    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 B routed to IRQ 5
    Region 4: I/O ports at 0400 [size=32]
    Kernel modules: i2c-i801

02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 02)
    Subsystem: Dell Device 02e1
    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: 32 bytes
    Interrupt: pin A routed to IRQ 26
    Region 0: I/O ports at e800 [size=256]
    Region 2: Memory at fdfff000 (64-bit, prefetchable) [size=4K]
    Region 4: Memory at fdfe0000 (64-bit, prefetchable) [size=64K]
    Expansion ROM at febe0000 [disabled] [size=128K]
    Capabilities: <access denied>
    Kernel driver in use: r8169
    Kernel modules: r8169

log$ tail -n 15 Xorg.0.log.old 
 for help. 
Please also check the log file at "/var/log/Xorg.0.log" for additional information.

(II) Power Button: Close
(II) UnloadModule: "evdev"
(II) Power Button: Close
(II) UnloadModule: "evdev"
(II) USB Optical Mouse: Close
(II) UnloadModule: "evdev"
(II) Dell Dell USB Entry Keyboard: Close
(II) UnloadModule: "evdev"
(II) Macintosh mouse button emulation: Close
(II) UnloadModule: "evdev"
(II) AIGLX: Suspending AIGLX clients for VT switch
 ddxSigGiveUp: Closing log