Public bug reported:

I'm running 13.10 with Gnome-Fallback and a Trinity Radeon HD 7540 and I'm 
encountering flickering (among individual objects - not the whole display), 
screen regions being randomly shaded (in at least Firefox and LibreOffice Calc) 
and object drawing failures (the grid in a Calc document). These problems can 
be reliably reproduced.
Here's a screenshot:
http://i.stack.imgur.com/tRi9X.png
Thanks,

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: xorg 1:7.7+1ubuntu6
ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
Uname: Linux 3.11.0-14-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
Date: Wed Dec 18 16:33:32 2013
DistUpgraded: Fresh install
DistroCodename: saucy
DistroVariant: ubuntu
DkmsStatus:
 bcmwl, 6.30.223.141+bdcom, 3.11.0-12-generic, x86_64: installed
 bcmwl, 6.30.223.141+bdcom, 3.11.0-13-generic, x86_64: installed
 bcmwl, 6.30.223.141+bdcom, 3.11.0-14-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Trinity [Radeon HD 7540D] [1002:9991] 
(prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:8526]
InstallationDate: Installed on 2013-11-18 (30 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: System manufacturer System Product Name
MarkForUpload: True
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-14-generic 
root=UUID=8cfc9594-cba1-4a77-99f1-3010c13e1445 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/30/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 5024
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: F2A85-M PRO
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr5024:bd08/30/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnF2A85-MPRO:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.46-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.2.1-1ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.2.1-1ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.14.3-3ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1
xserver.bootTime: Tue Dec 17 17:03:50 2013
xserver.configfile: default
xserver.devices:
 input        Power Button         KEYBOARD, id 6
 input        Power Button         KEYBOARD, id 7
 input        Dell Dell USB Keyboard KEYBOARD, id 8
 input        Logitech USB-PS/2 Optical Mouse MOUSE, id 9
 input        Eee PC WMI hotkeys   KEYBOARD, id 10
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.14.3-3ubuntu2
xserver.video_driver: radeon

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug saucy ubuntu

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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1262377

Title:
  Screen rendering problem

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