I am also experiencing this problem.
Output of `lspci -vvnn':
00:00.0 Host bridge [0600]: Intel Corporation 82815 815 Chipset Host Bridge and
Memory Controller Hub [8086:1130] (rev 02)
Subsystem: Dell Unknown device [1028:00d7]
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 82815 CGC [Chipset
Graphics Controller] [8086:1132] (rev 02) (prog-if 00 [VGA])
Subsystem: Dell Unknown device [1028:00d7]
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 9
Region 0: Memory at f4000000 (32-bit, prefetchable) [size=64M]
Region 1: Memory at ff000000 (32-bit, non-prefetchable) [size=512K]
Capabilities: <access denied>
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 PCI Bridge [8086:244e] (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
Bus: primary=00, secondary=01, subordinate=01, sec-latency=64
I/O behind bridge: 0000e000-0000efff
Memory behind bridge: fd000000-feffffff
Prefetchable memory behind bridge: f9000000-f9ffffff
Secondary status: 66MHz- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- <SERR- <PERR-
BridgeCtl: Parity- SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-
00:1f.0 ISA bridge [0601]: Intel Corporation 82801BA ISA Bridge (LPC)
[8086:2440] (rev 02)
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
00:1f.1 IDE interface [0101]: Intel Corporation 82801BA IDE U100 [8086:244b]
(rev 02) (prog-if 80 [Master])
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
Region 0: [virtual] Memory at 000001f0 (32-bit, non-prefetchable)
[disabled] [size=8]
Region 1: [virtual] Memory at 000003f0 (type 3, non-prefetchable)
[disabled] [size=1]
Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable)
[disabled] [size=8]
Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable)
[disabled] [size=1]
Region 4: I/O ports at ffa0 [size=16]
00:1f.2 USB Controller [0c03]: Intel Corporation 82801BA/BAM USB (Hub #1)
[8086:2442] (rev 02) (prog-if 00 [UHCI])
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 D routed to IRQ 11
Region 4: I/O ports at ff80 [size=32]
00:1f.3 SMBus [0c05]: Intel Corporation 82801BA/BAM SMBus [8086:2443] (rev 02)
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-
Interrupt: pin B routed to IRQ 10
Region 4: I/O ports at dcd0 [size=16]
00:1f.5 Multimedia audio controller [0401]: Intel Corporation 82801BA/BAM AC'97
Audio [8086:2445] (rev 02)
Subsystem: Dell Unknown device [1028:00d7]
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 B routed to IRQ 10
Region 0: I/O ports at d800 [size=256]
Region 1: I/O ports at dc80 [size=64]
01:0c.0 Ethernet controller [0200]: 3Com Corporation 3c905C-TX/TX-M [Tornado]
[10b7:9200] (rev 78)
Subsystem: Dell Unknown device [1028:00d7]
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: 64 (2500ns min, 2500ns max), Cache Line Size: 32 bytes
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at ec80 [size=128]
Region 1: Memory at fdfffc00 (32-bit, non-prefetchable) [size=128]
Expansion ROM at f9000000 [disabled] [size=128K]
Capabilities: <access denied>
** Attachment added: "x.org.conf"
http://launchpadlibrarian.net/9141479/xorg.conf
--
Black Bar Across Screen with latest Xorg Update
https://bugs.launchpad.net/bugs/137604
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