After upgrading LTS from 12.04 to 14.04 I have the same issue. I have a 4 monitor setup with 2 graphic cards. I tried a lot of configruations / drivers, but the only thing that "worked" was completly uninstalling fglrx and connecting 3 monitors to 1 graphic card.
Setup: ------ 1x Radeon HD 6450 -- 2x DVI BenQ GW2750 -- 1x HDMI BenQ GW2750 1x Radeon HD 6450 -- 1x DVI BenQ GW2750 Result --------- Mouse Flicker on the 3 monitor system. No flicker on the 1 Monitor system. Funny thing ----------- When changing to gnome 3 or Xfce the flickering disapears -> Unity Bug? cat /etc/issue -------------- Ubuntu 14.04 LTS lspci | grep -i vga ------------------- 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM] 02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM] -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1278223 Title: Mouse Flickering after adding 3rd Monitor Status in “xorg” package in Ubuntu: Confirmed Bug description: My issues is, after adding a 3rd monitor to Ubuntu 14.04, the mouse flickers (or blinks) when the cursor is on monitors one or two, but not 3. Monitor 1: 1440 x 900 - Laptop's Native Monitor Monitor 2: 1920 x 1080 - Laptop's HDMI Port's External Monitor Monitor 3: 1024 x 768 - SIIG USB 2.0 to VGA Pro Monitor Here's the video card that feeds my laptop's native monitor, monitor 2 (hdmi). lspci | grep 'VGA\|Display' 00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) 00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) The 3rd Monitor is powered through a Display Link certified SIIG USB 2.0 to VGA Pro adapter (A2H1320X1374 - not sure what this number, but it is a sticker on back of the device): lsusb -tv /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/6p, 480M |__ Port 6: Dev 2, If 0, Class=Video, Driver=uvcvideo, 480M |__ Port 6: Dev 2, If 1, Class=Video, Driver=uvcvideo, 480M dmesg [ 1.688343] usb 2-1: New USB device found, idVendor=17e9, idProduct=02ee [ 1.688348] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 1.688351] usb 2-1: Product: VGA Display Adapter [ 1.688353] usb 2-1: Manufacturer: DisplayLink [ 1.688356] usb 2-1: SerialNumber: 119785 Additionally, unity-control-center crashes sometimes after I "Restore previous settings", after selecting a resolution too high. This freezed my laptop, requiring a hard reboot. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: unity-control-center 14.04.1-0ubuntu5 ProcVersionSignature: Ubuntu 3.13.0-8.27-generic 3.13.2 Uname: Linux 3.13.0-8-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.13.2-0ubuntu2 Architecture: amd64 CurrentDesktop: Unity Date: Sun Feb 9 18:43:13 2014 InstallationDate: Installed on 2014-02-02 (7 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140202) SourcePackage: unity-control-center UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1278223/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
