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Output of lspci command:

00:00.0 Host bridge: Intel Corporation 82945G/GZ/P/PL Memory Controller Hub (rev 02)                                                                                    
00:02.0 VGA compatible controller: Intel Corporation 82945G/GZ Integrated Graphics Controller (rev 02)                                                                  
00:1b.0 Audio device: Intel Corporation NM10/ICH7 Family High Definition Audio Controller (rev 01)                                                                      
00:1c.0 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 1 (rev 01)                                                                                      
00:1c.1 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 2 (rev 01)                                                                                      
00:1c.2 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 3 (rev 01)                                                                                      
00:1c.3 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 4 (rev 01)                                                                                      
00:1d.0 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #1 (rev 01)                                                                              
00:1d.1 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #2 (rev 01)                                                                              
00:1d.2 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #3 (rev 01)                                                                              
00:1d.3 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #4 (rev 01)                                                                              
00:1d.7 USB controller: Intel Corporation NM10/ICH7 Family USB2 EHCI Controller (rev 01)                                                                                
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1)                                                                                                         
00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01)                                                                            
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 01)                                                                                   
00:1f.2 IDE interface: Intel Corporation NM10/ICH7 Family SATA Controller [IDE mode] (rev 01)                                                                           
00:1f.3 SMBus: Intel Corporation NM10/ICH7 Family SMBus Controller (rev 01)                                                                                             
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 01)

I open Firefox and after some minutes using it, suddenly the screen
display is "visually damaged" by a lot of very thin horizontal white
lines. This began to happen after upgrading to Kubuntu 15.10 and someone
via IRC suggested me this workaround: Go to KDE System Settings ->
Display configuration -> Compositor -> Tearing prevention (vsync) = set
to 'never'; I did that and by fortune it worked!

After this bug is reviewed and solved, I would like to restore the
Tearing prevention (vsync) setting to "Automatic" again.

Thanks in advance for attending this.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: i965-va-driver 1.6.0-1
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
ApportVersion: 2.19.1-0ubuntu3
Architecture: amd64
CurrentDesktop: KDE
Date: Sun Oct 25 16:28:21 2015
InstallationDate: Installed on 2015-02-14 (253 days ago)
InstallationMedia: Kubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
SourcePackage: intel-vaapi-driver
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug wily
-- 
Horizontal white lines appear messing the screen display after upgrading to Kubuntu 15.10 a computer with Intel Graphics hardware
https://bugs.launchpad.net/bugs/1509868
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