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I am using Ubuntu 12.04. Suddenly sometimes violet coloured lines show up on my pc screen lines like this:
enter image description here

Why are these kind of lines appearing on the screen?
Running lspci gave the following output:

lspci
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b4)
00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b4)
00:1c.5 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 6 (rev b4)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation HM65 Express Chipset Family LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller (rev 04)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 04)
07:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01)
0d:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5116 PCI Express Card Reader (rev 01)
13:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)  

lsmod gave the following output:

lsmod
Module                  Size  Used by
cdc_acm                26992  0 
ath3k                  12969  0 
ipt_MASQUERADE         12760  0 
xt_DSCP                12630  0 
nf_conntrack_irc       13384  0 
snd_hrtimer            12745  1 
snd_hda_codec_hdmi     32476  1 
snd_hda_codec_conexant    58308  1 
pci_stub               12623  1 
vboxpci                23237  0 
vboxnetadp             13383  0 
vboxnetflt             23479  0 
vboxdrv               287105  3 vboxpci,vboxnetadp,vboxnetflt
joydev                 17694  0 
coretemp               13642  0 
kvm_intel             137888  0 
kvm                   422160  1 kvm_intel
ghash_clmulni_intel    13221  0 
hid_generic            12541  0 
cryptd                 20531  1 ghash_clmulni_intel
usbhid                 47259  0 
iptable_nat            13230  0 
hid                   100815  2 hid_generic,usbhid
iptable_mangle         12735  0 
snd_hda_intel          34117  3 
snd_hda_codec         135141  3 snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_hda_intel
snd_hwdep              17765  1 snd_hda_codec
uvcvideo               78117  0 
videobuf2_core         33025  1 uvcvideo
snd_pcm                97523  3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
btusb                  22432  0 
videodev              125126  2 uvcvideo,videobuf2_core
xt_hl                  12522  6 
videobuf2_vmalloc      12861  1 uvcvideo
videobuf2_memops       13405  1 videobuf2_vmalloc
snd_seq_midi           13325  0 
ip6t_rt                12559  3 
bnep                   18240  2 
snd_rawmidi            30750  1 snd_seq_midi
snd_seq_midi_event     14900  1 snd_seq_midi
nf_conntrack_ipv6      14107  7 
nf_defrag_ipv6         13413  1 nf_conntrack_ipv6
microcode              23030  0 
ipt_REJECT             12577  1 
snd_seq                61931  3 snd_seq_midi,snd_seq_midi_event
xt_LOG                 17454  12 
xt_limit               12712  13 
parport_pc             32867  0 
xt_tcpudp              12604  16 
ppdev                  17114  0 
xt_addrtype            12714  0 
arc4                   12530  2 
xt_state               12579  13 
psmouse               102075  0 
rfcomm                 47562  0 
ip6table_filter        12816  1 
bluetooth             211812  15 ath3k,btusb,bnep,rfcomm
serio_raw              13216  0 
ip6_tables             27686  2 ip6t_rt,ip6table_filter
nf_conntrack_netbios_ns    12666  0 
nf_conntrack_broadcast    12590  1 nf_conntrack_netbios_ns
nf_nat_ftp             12705  0 
nf_nat                 25646  3 ipt_MASQUERADE,iptable_nat,nf_nat_ftp
nf_conntrack_ipv4      14531  9 iptable_nat,nf_nat
nf_defrag_ipv4         12730  1 nf_conntrack_ipv4
nf_conntrack_ftp       13453  1 nf_nat_ftp
nf_conntrack           83300  11 ipt_MASQUERADE,nf_conntrack_irc,iptable_nat,nf_conntrack_ipv6,xt_state,nf_conntrack_netbios_ns,nf_conntrack_broadcast,nf_nat_ftp,nf_nat,nf_conntrack_ipv4,nf_conntrack_ftp
iptable_filter         12811  1 
snd_timer              29990  3 snd_hrtimer,snd_pcm,snd_seq
ip_tables              27474  3 iptable_nat,iptable_mangle,iptable_filter
lpc_ich                17145  0 
x_tables               29892  16 ipt_MASQUERADE,xt_DSCP,iptable_nat,iptable_mangle,xt_hl,ip6t_rt,ipt_REJECT,xt_LOG,xt_limit,xt_tcpudp,xt_addrtype,xt_state,ip6table_filter,ip6_tables,iptable_filter,ip_tables
snd_seq_device         14498  3 snd_seq_midi,snd_rawmidi,snd_seq
sony_laptop            54939  0 
rts_pstor             445318  0 
ath9k                 150049  0 
snd                    83674  17 snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
mac80211              601865  1 ath9k
ath9k_common           14054  1 ath9k
ath9k_hw              413487  2 ath9k,ath9k_common
ath                    23828  3 ath9k,ath9k_common,ath9k_hw
i915                  530857  3 
cfg80211              524435  3 ath9k,mac80211,ath
compat                 19596  5 ath9k,mac80211,ath9k_common,ath9k_hw,cfg80211
drm_kms_helper         49259  1 i915
soundcore              15092  1 snd
mei                    41410  0 
drm                   290344  4 i915,drm_kms_helper
snd_page_alloc         18573  2 snd_hda_intel,snd_pcm
mac_hid                13254  0 
i2c_algo_bit           13565  1 i915
video                  19598  1 i915
usbserial              42594  0 
lp                     17800  0 
parport                46563  3 parport_pc,ppdev,lp
binfmt_misc            17541  1 
r8169                  62766  0   

lshw gave the following output:

lshw
sony-vpceh15en            
    description: Notebook
    product: VPCEH15EN (N/A)
    vendor: Sony Corporation
    version: C105TU5U
    serial: 27544512-7009048
    width: 64 bits
    capabilities: smbios-2.7 dmi-2.7 vsyscall32
    configuration: boot=normal chassis=notebook family=VAIO sku=N/A uuid=C0CC3724-1DF6-DE11-88CF-78843CE70F5A
  *-core
       description: Motherboard
       product: VAIO
       vendor: Sony Corporation
       physical id: 0
       version: N/A
       serial: N/A
     *-firmware
          description: BIOS
          vendor: INSYDE
          physical id: 0
          version: R0180Z9
          date: 04/28/2011
          size: 1MiB
          capacity: 1984KiB
          capabilities: pci pnp upgrade shadowing cdboot bootselect edd int9keyboard int10video acpi usb smartbattery biosbootspecification netboot
     *-memory
          description: System Memory
          physical id: 7
          slot: System board or motherboard
          size: 2GiB
        *-bank:0
             description: SODIMM DDR3
             physical id: 0
             slot: SODIMM1
             size: 2GiB
             width: 64 bits
        *-bank:1
             description: SODIMM [empty]
             physical id: 1
             slot: SODIMM2
     *-cpu
          description: CPU
          product: Intel(R) Core(TM) i3-2310M CPU @ 2.10GHz
          vendor: Intel Corp.
          physical id: c
          bus info: cpu@0
          version: Intel(R) Core(TM) i3-2310M CPU @ 2.10GHz
          serial: N/A
          slot: N/A
          size: 1300MHz
          capacity: 2100MHz
          width: 64 bits
          clock: 100MHz
          capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp x86-64 constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer xsave avx lahf_lm arat epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid cpufreq
        *-cache:0
             description: L1 cache
             physical id: d
             slot: L1 Cache
             size: 128KiB
             capacity: 128KiB
             capabilities: synchronous internal write-through
        *-cache:1
             description: L2 cache
             physical id: e
             slot: L2 Cache
             size: 512KiB
             capacity: 512KiB
             capabilities: synchronous internal write-through unified
        *-cache:2
             description: L3 cache
             physical id: f
             slot: L3 Cache
             size: 3MiB
             capacity: 3MiB
             capabilities: synchronous internal write-through unified
     *-pci
          description: Host bridge
          product: 2nd Generation Core Processor Family DRAM Controller
          vendor: Intel Corporation
          physical id: 100
          bus info: pci@0000:00:00.0
          version: 09
          width: 32 bits
          clock: 33MHz
        *-display
             description: VGA compatible controller
             product: 2nd Generation Core Processor Family Integrated Graphics Controller
             vendor: Intel Corporation
             physical id: 2
             bus info: pci@0000:00:02.0
             version: 09
             width: 64 bits
             clock: 33MHz
             capabilities: msi pm vga_controller bus_master cap_list rom
             configuration: driver=i915 latency=0
             resources: irq:43 memory:90000000-903fffff memory:80000000-8fffffff ioport:4000(size=64)
        *-communication
             description: Communication controller
             product: 6 Series/C200 Series Chipset Family MEI Controller #1
             vendor: Intel Corporation
             physical id: 16
             bus info: pci@0000:00:16.0
             version: 04
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi bus_master cap_list
             configuration: driver=mei latency=0
             resources: irq:42 memory:92604000-9260400f
        *-usb:0
             description: USB controller
             product: 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2
             vendor: Intel Corporation
             physical id: 1a
             bus info: pci@0000:00:1a.0
             version: 04
             width: 32 bits
             clock: 33MHz
             capabilities: pm debug ehci bus_master cap_list
             configuration: driver=ehci_hcd latency=0
             resources: irq:16 memory:92609000-926093ff
        *-multimedia
             description: Audio device
             product: 6 Series/C200 Series Chipset Family High Definition Audio Controller
             vendor: Intel Corporation
             physical id: 1b
             bus info: pci@0000:00:1b.0
             version: 04
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi pciexpress bus_master cap_list
             configuration: driver=snd_hda_intel latency=0
             resources: irq:44 memory:92600000-92603fff
        *-pci:0
             description: PCI bridge
             product: 6 Series/C200 Series Chipset Family PCI Express Root Port 1
             vendor: Intel Corporation
             physical id: 1c
             bus info: pci@0000:00:1c.0
             version: b4
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:17 memory:92500000-925fffff
           *-network
                description: Wireless interface
                product: AR9285 Wireless Network Adapter (PCI-Express)
                vendor: Atheros Communications Inc.
                physical id: 0
                bus info: pci@0000:07:00.0
                logical name: mon0
                version: 01
                serial: cc:af:78:b3:e5:0f
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi pciexpress bus_master cap_list logical wireless ethernet physical
                configuration: broadcast=yes driver=ath9k driverversion=3.5.0-23-generic firmware=N/A ip=192.168.1.3 latency=0 link=yes multicast=yes promiscuous=yes wireless=IEEE 802.11bgn
                resources: irq:16 memory:92500000-9250ffff
        *-pci:1
             description: PCI bridge
             product: 6 Series/C200 Series Chipset Family PCI Express Root Port 4
             vendor: Intel Corporation
             physical id: 1c.3
             bus info: pci@0000:00:1c.3
             version: b4
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:19 ioport:3000(size=4096) memory:91500000-924fffff ioport:90400000(size=16777216)
           *-generic
                description: Unassigned class
                product: RTS5116 PCI Express Card Reader
                vendor: Realtek Semiconductor Co., Ltd.
                physical id: 0
                bus info: pci@0000:0d:00.0
                logical name: scsi6
                version: 01
                width: 32 bits
                clock: 33MHz
                capabilities: pm msi pciexpress bus_master cap_list emulated scsi-host
                configuration: driver=rts_pstor latency=0
                resources: irq:19 memory:91500000-91500fff
              *-disk
                   description: SCSI Disk
                   physical id: 0.0.0
                   bus info: scsi@6:0.0.0
                   logical name: /dev/sdb
        *-pci:2
             description: PCI bridge
             product: 6 Series/C200 Series Chipset Family PCI Express Root Port 6
             vendor: Intel Corporation
             physical id: 1c.5
             bus info: pci@0000:00:1c.5
             version: b4
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:16 ioport:2000(size=4096) ioport:91400000(size=1048576)
           *-network
                description: Ethernet interface
                product: RTL8111/8168B PCI Express Gigabit Ethernet controller
                vendor: Realtek Semiconductor Co., Ltd.
                physical id: 0
                bus info: pci@0000:13:00.0
                logical name: eth0
                version: 06
                serial: 78:84:3c:e7:0f:5a
                size: 10Mbit/s
                capacity: 1Gbit/s
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
                configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl_nic/rtl8168e-2.fw latency=0 link=no multicast=yes port=MII speed=10Mbit/s
                resources: irq:41 ioport:2000(size=256) memory:91404000-91404fff memory:91400000-91403fff
        *-usb:1
             description: USB controller
             product: 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1
             vendor: Intel Corporation
             physical id: 1d
             bus info: pci@0000:00:1d.0
             version: 04
             width: 32 bits
             clock: 33MHz
             capabilities: pm debug ehci bus_master cap_list
             configuration: driver=ehci_hcd latency=0
             resources: irq:23 memory:92608000-926083ff
        *-isa
             description: ISA bridge
             product: HM65 Express Chipset Family LPC Controller
             vendor: Intel Corporation
             physical id: 1f
             bus info: pci@0000:00:1f.0
             version: 04
             width: 32 bits
             clock: 33MHz
             capabilities: isa bus_master cap_list
             configuration: latency=0
        *-storage
             description: SATA controller
             product: 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller
             vendor: Intel Corporation
             physical id: 1f.2
             bus info: pci@0000:00:1f.2
             version: 04
             width: 32 bits
             clock: 66MHz
             capabilities: storage msi pm ahci_1.0 bus_master cap_list
             configuration: driver=ahci latency=0
             resources: irq:40 ioport:4088(size=8) ioport:4094(size=4) ioport:4080(size=8) ioport:4090(size=4) ioport:4060(size=32) memory:92607000-926077ff
        *-serial UNCLAIMED
             description: SMBus
             product: 6 Series/C200 Series Chipset Family SMBus Controller
             vendor: Intel Corporation
             physical id: 1f.3
             bus info: pci@0000:00:1f.3
             version: 04
             width: 64 bits
             clock: 33MHz
             configuration: latency=0
             resources: memory:92605000-926050ff ioport:4040(size=32)
     *-scsi:0
          physical id: 1
          logical name: scsi0
          capabilities: emulated
        *-disk
             description: ATA Disk
             product: TOSHIBA MK3265GS
             vendor: Toshiba
             physical id: 0.0.0
             bus info: scsi@0:0.0.0
             logical name: /dev/sda
             version: GH01
             serial: 51RHD5ZNB
             size: 298GiB (320GB)
             capabilities: partitioned partitioned:dos
             configuration: ansiversion=5 signature=31d2e51f
           *-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: 7a10-3e4b
                size: 10GiB
                capacity: 10GiB
                capabilities: primary ntfs initialized
                configuration: clustersize=4096 created=2012-09-20 06:57:12 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: 2211-22b9
                size: 81MiB
                capacity: 100MiB
                capabilities: primary bootable ntfs initialized
                configuration: clustersize=4096 created=2012-09-20 06:57:15 filesystem=ntfs label=System Reserved 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: f82916f5-3a21-3848-88f6-cf2de9978d9b
                size: 159GiB
                capacity: 159GiB
                capabilities: primary ntfs initialized
                configuration: clustersize=4096 created=2012-09-20 06:57:16 filesystem=ntfs modified_by_chkdsk=true mounted_on_nt4=true resize_log_file=true state=dirty upgrade_on_mount=true
           *-volume:3
                description: Extended partition
                physical id: 4
                bus info: scsi@0:0.0.0,4
                logical name: /dev/sda4
                size: 127GiB
                capacity: 127GiB
                capabilities: primary extended partitioned partitioned:extended
              *-logicalvolume:0
                   description: HPFS/NTFS partition
                   physical id: 5
                   logical name: /dev/sda5
                   capacity: 89GiB
              *-logicalvolume:1
                   description: Linux filesystem partition
                   physical id: 6
                   logical name: /dev/sda6
                   logical name: /
                   capacity: 35GiB
                   configuration: mount.fstype=ext4 mount.options=rw,relatime,errors=remount-ro,data=ordered state=mounted
              *-logicalvolume:2
                   description: Linux swap / Solaris partition
                   physical id: 7
                   logical name: /dev/sda7
                   capacity: 1991MiB
                   capabilities: nofs
     *-scsi:1
          physical id: 2
          logical name: scsi3
          capabilities: emulated
        *-cdrom
             description: DVD-RAM writer
             product: DVD RW AD-7710H
             vendor: Optiarc
             physical id: 0.0.0
             bus info: scsi@3:0.0.0
             logical name: /dev/cdrom
             logical name: /dev/cdrw
             logical name: /dev/dvd
             logical name: /dev/dvdrw
             logical name: /dev/sr0
             version: 1.V0
             capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
             configuration: ansiversion=5 status=nodisc  

sudo uname -a gave the following output:

sudo uname -a
Linux sony-VPCEH15EN 3.5.0-23-generic #35~precise1-Ubuntu SMP Fri Jan 25 17:13:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux  

sudo lsb_release -a gave the following output:

sudo lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 12.04.2 LTS
Release:    12.04
Codename:   precise
share|improve this question
    
It seems a video card driver error. Please provide some technical details about your system like output from lspci, lsmod, lshw. –  Frantique Sep 3 '13 at 9:16
    
Yes Frantique is right! It is possible your graphics driver doesn't match with your Linux Kernel. Please provide some more information like: sudo uname -a and sudo lsb_release -a –  Saurav Kumar Sep 3 '13 at 9:37
    
That is what I was expecting. I just wanted to know about the Kernel in use and the Ubuntu LTS Version. I had the same problem and recovered by installing Kernel 3.8.0 and Xserver-Xorg::-lts-raring packages. Reply the output of this command just for surety: sudo dpkg -l | grep xserver-xorg-video-intel You can simply fix from this by upgrading your system to 12.03. If you don't want to upgrade then reply.. –  Saurav Kumar Sep 3 '13 at 11:11
    
sudo dpkg -l | grep xserver-xorg-video-intel ii xserver-xorg-video-intel-lts-quantal 2:2.20.9-0ubuntu2.2~precise1 X.Org X server -- Intel i8xx, i9xx display driver –  M.Tarun Sep 3 '13 at 11:21

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