There are changes in the 3.13 kernel that make Radeon HD 7xxx hardware faster and more stable. Ubuntu 14.04 "Trusty Tahr" currently has the 3.13.0-12.32 kernel. Are you able to test it?
Also, the upstream 3.14 kernel has this commit (which has also been ccd to the stable kernel series) which eliminates the display corruption some people have had with recent kernels: author Alex Deucher committer Alex Deucher commit 6d8ea7de3f5035610f3bfacbe35e7b71ad1e4663 tree 215fe5cacbd723866e8515ae41734d56dc547bd6 parent 78b035101999d8d071781778c019c387dc8bebb2 drm/radeon: fix display tiling setup on SI Apply the same logic as CI to SI for setting up the display tiling parameters. The num banks may vary per tiling index just like CI. Bugs: https://bugs.freedesktop.org/show_bug.cgi?id=71488 https://bugs.freedesktop.org/show_bug.cgi?id=73946 https://bugs.freedesktop.org/show_bug.cgi?id=74927 Signed-off-by: Alex Deucher Cc: stable A PPA of the 3.14.1 kernel is available at http://kernel.ubuntu.com /~kernel-ppa/mainline/ and instructions on how to install and uninstall it are available at https://wiki.ubuntu.com/Kernel/MainlineBuilds Also the upstream 3.15-rc2 kernel will add support for newer memory controller microcode on your Cape Verde PRO GPU, which "May fix stability issues". ** Bug watch added: freedesktop.org Bugzilla #71488 https://bugs.freedesktop.org/show_bug.cgi?id=71488 ** Bug watch added: freedesktop.org Bugzilla #73946 https://bugs.freedesktop.org/show_bug.cgi?id=73946 ** Bug watch added: freedesktop.org Bugzilla #74927 https://bugs.freedesktop.org/show_bug.cgi?id=74927 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-video-ati in Ubuntu. https://bugs.launchpad.net/bugs/1247043 Title: RadeonHD Southern Islands text rendering glitch Status in “xserver-xorg-video-ati” package in Ubuntu: Incomplete Bug description: 3D rendering landed recently for Southern Islands cards. However there are some rendering glitches that happen rarely. The most common of these is text rendering glitch in Firefox. What happens is that every now and then a letter is drawn incorrectly. It may be drawn as (semi)random pixels or a zoomed part of some other piece of text. On redraw (triggered by e.g. pgup + pgdown) the text is drawn correctly. Attached is an image showing the corruption. It is taken with a camera, because trying to do a screengrab forces a redraw which clears the error. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: xserver-xorg-video-ati 1:7.2.0-0ubuntu10 ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6 Uname: Linux 3.11.0-13-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.12.5-0ubuntu2.1 Architecture: amd64 CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell] CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true Date: Fri Nov 1 12:09:23 2013 DistUpgraded: 2013-08-08 13:45:48,588 DEBUG enabling apt cron job DistroCodename: saucy DistroVariant: ubuntu DkmsStatus: virtualbox, 4.2.16, 3.11.0-11-generic, x86_64: installed virtualbox, 4.2.16, 3.11.0-12-generic, x86_64: installed virtualbox, 4.2.16, 3.11.0-13-generic, x86_64: installed virtualbox, 4.2.16, 3.11.0-8-generic, x86_64: installed virtualbox, 4.2.16, 3.11.0-9-generic, x86_64: installed DpkgLog: ExtraDebuggingInterest: Yes GraphicsCard: Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde PRO [Radeon HD 7750] [1002:683f] (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Device [1043:0459] InstallationDate: Installed on 2013-05-20 (165 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) MarkForUpload: True ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.11.0-13-generic root=UUID=7dd49803-456a-4327-aeb5-7ea47105ef3e ro rootflags=subvol=@ quiet splash vt.handoff=7 SourcePackage: xserver-xorg-video-ati UpgradeStatus: Upgraded to saucy on 2013-08-08 (84 days ago) dmi.bios.date: 05/16/2013 dmi.bios.vendor: Intel Corp. dmi.bios.version: EBH7710H.86A.0101.2013.0516.1649 dmi.board.name: DH77EB dmi.board.vendor: Intel Corporation dmi.board.version: AAG39073-304 dmi.chassis.type: 3 dmi.modalias: dmi:bvnIntelCorp.:bvrEBH7710H.86A.0101.2013.0516.1649:bd05/16/2013:svn:pn:pvr:rvnIntelCorporation:rnDH77EB:rvrAAG39073-304:cvn:ct3:cvr: version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.46-1 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: Fri Nov 1 09:39:25 2013 xserver.configfile: default xserver.devices: input Power Button KEYBOARD, id 6 input Power Button KEYBOARD, id 7 input Logitech Logitech USB Keyboard KEYBOARD, id 8 input Logitech Logitech USB Keyboard KEYBOARD, id 9 input Logitech USB-PS/2 Optical Mouse MOUSE, id 10 xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.version: 2:1.14.3-3ubuntu2 xserver.video_driver: radeon To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1247043/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
