Interesting enough Geoff, since the latest Jaunty updates... this issue appears to have cleared up... I am not seeing any of the distortion I was even with both cores at 0% load.
My current /boot/grub/menu.1st config... title Ubuntu jaunty (development branch), kernel 2.6.28-11-generic uuid 9078557b-c77b-4e32-9884-fab3ac332bcc kernel /boot/vmlinuz-2.6.28-11-generic root=UUID=9078557b-c77b-4e32-9884-fab3ac332bcc ro quiet splash initrd /boot/initrd.img-2.6.28-11-generic quiet Can you confirm, your running this config? -don Quoting Geoff L <ge...@au.warpmail.net>: > FYI I'm seeing exactly the same effect. > > A fresh install of either 8.10 or 9.04 (AMD64 desktop). Then install > flgrx using ubuntu restricted drivers manager and I get this problem. > > Loading the CPU cleans all the flickering off the screen. It's a dual > core processor, only one core needs to be loaded up to get rid of the > flickering. > > My hardware looks pretty similar to previous post. Same AMD chipset, > same Radeon HD 3200 video adapter. > > One difference is that I see frame rates up around 1400 fps not 400/200 > per previous post. > > -- > ati driver 2.6 kernel timings 2d desktop random horizontial flicker > https://bugs.launchpad.net/bugs/355262 > You received this bug notification because you are a direct subscriber > of the bug. > > Status in “linux” source package in Ubuntu: New > > Bug description: > ---Fresh install of Ubuntu 8.04 > Found the ati drivers 2d and 3d accel to work fine, with the > exception of flash. Flash performance is slow, choppy and reveals > horrible motion blur watching a 480p movie on hulu. No horizontal > lines on the desktop whatsover, this what I refer to as "flicker". > Its hard to describe but it appears to be simply the vertical > refresh of pixels skips lines... underscan/overscan? I dont know. > > ---Fresh install of Ubuntu 8.10 > Immediately after installing the proprietary drivers and rebooting, > the desktop became almost useless as hundreds of random horizontal > lines covered the left half of the screen. Thinking this was a bad > install I cksum'd the iso, then reinstalled fresh and reattached the > driver. Same result.. At this time I thought it was simply the > typical lousy ATI drivers and reverted back to 8.04 to live with > sub-par flash performance but a usable desktop. > > ---Fresh install of Ubuntu 9.04 > I can't resist new toys... > Exact same issue though. I searched google for hours looking for > another complaint on these lines, found similar issues but none of > the workarounds resolved. Being determined to play with this load > and after many reinstalls I noticed a pattern to these horizontal > lines. The lines reduced and almost disappeared when I ran > fgl_glxgears? > > Odd I thought but sure enough readily reproduceable. Another > oddity ... after running fgl_glxgears for 30 seconds or so I saw my > frame rate drop from 400fps to ~200fps. Subsequent startup of > fgl_glxgears kept my framerate to 200fps until rebooting. > > With this I found message logs stating "clocksource tsc unstable", > yet no message that it chose another clocksource... With that I > decided to add "notsc" to my kernel line... didn't stop the lines... > did stop the unstable warnings. > > Thinking some sort of timing issue and "load -- fgl_glxgears" > apparently reduced the lines I decided to run > "nice dd if=/dev/zero of=/dev/null" to artificially load the cores > on the cpu. > HOLY clear screen batman.. The lines were gone and when I say gone I > mean not even a single pixel out of place. > > Now I am on to something here.. I had followed the ATI wiki > suggestions to "turn off effects", "tweak overlays" and all sorts of > things to drop this flicker... none really reduced them. Putting > this artifical load on the cpu's cleared up the artifacts completely. > > More tests I ran... > > Back to this fps oddity observed in fgl_glxgears... > With notsc set , and "nice dd if=/dev/zero of=/dev/null" running... > fgl_glxgears remains at 400fps consistently and no flicker > is observed anywhere.. desktop or 3d window. > With notsc not set (apparently hpet timing), and "nice dd > if=/dev/zero of=/dev/null" running... > fgl_glxgears starts out at 400fps, drops to 200fps and > remains there until reboot, no flicker. > CPU ondemand. > When my cpu slows are speeds up... the # of random horizontal > lines increases. > Disabling ondemand using the scaling widget and manually setting > the CPU to 2.50ghz (max rated) seems to > keep most lines away. > > So I am not sure if this is a ATI driver problem or a kernel timing problem? > Hope this helps someone. For now I will simply nicely load the > cpu's when I want a clear desktop or movie :) > > -don > > ProblemType: Bug > Architecture: amd64 > DistroRelease: Ubuntu 9.04 > MachineType: System manufacturer System Product Name > NonfreeKernelModules: fglrx > Package: linux-image-2.6.28-11-generic 2.6.28-11.40 > ProcCmdLine: root=UUID=9078557b-c77b-4e32-9884-fab3ac332bcc ro quiet > splash notsc > ProcEnviron: > LANG=en_US.UTF-8 > SHELL=/bin/bash > ProcVersionSignature: Ubuntu 2.6.28-11.40-generic > SourcePackage: linux > -- ati driver 2.6 kernel timings 2d desktop random horizontial flicker https://bugs.launchpad.net/bugs/355262 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
