Dear Ones, Thank you for your replies. A clue to the mystery has been found and I'm writing about it below.
BTW, Would it count as top posting if I write some of the message here at the top and some inline or is it OK this way? First things first: Here's a video(1) of the stuttering / framedrop. I hope it demonstrated the issue. Windows 7 runs smooth, without the stuttering / framedrop problem, with a driver that's been automatically installed from Windows Update in my LCD's maximum resolution of 1280x1024. A Live image of Ubuntu Desktop 12.04 amd64 was also tested. It had the same stuttering / framedrop. As per Alex's suggestion, attached is glxinfo. It seems to say that acceleration is on. Apparently, testing with a dedicated PCI Express GPU (Radeon R300 if I remember correctly), the stuttering persisted. 2012/2/9 Michel Dänzer <[email protected]> > > On Don, 2012-02-09 at 02:03 +0200, Shahar Or wrote: > > > > Since replacing an AMD Sempron 140 with an AMD FX-4100 CPU in my > > system > > Literally only replacing the CPU in the socket, nothing else changed? Actually, as per Gigabyte's instructions(2), in order to have support for this CPU, I upgraded the BIOS from the "F2" version to the "F3" version before replacing the CPU (flashrom FTW!) If it is necessary, I can put in the old Sempron 140 CPU for testing. > > I'm experiencing frame drops in practically anything. They seem > > to be CPU activity related and they are very frequent. > > What exactly does 'seem to be CPU activity related' mean? If it means > the frame drops coincide with high CPU usage, a CPU profile from perf, > sysprof or oprofile corresponding to a frame drop could be interesting. First, for clarification, I don't yet know how to use perf, sysrop or oprofile. So I installed the three of them from the distribution repositories (reporting a bug along the way(3)) and found out that perf has a nice long tutorial(4) which I would prefer to abstain from reading :) if you'll excuse me. So I ran sysprof, which is an easy GUI and to my content I only needed to press a "Start" button :). That's when the magic happened. From the moment it starts the stuttering goes away. Sweet rendering smoothness of divine electrical display benefaction ensues! And from the moment I press "Profile" to stop it, it stops and stuttering returns OMG. And this is perfectly persistent. What does this mean? > > Please let me know if you think that this could be radeon driver > > related or something else because I really don't know where to > > start... I even looked at the AMD cache penalties bug: > > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/862583 > > But it shouldn't make such a big noticeable problem, right? > > That indeed seems unlikely, but you could always try > applying/disabling/reverting the patch(es) just in case. > > > > The BIOS is latest version. > > Does it have proper support for the new CPU? Like I said, It should have, according to Gigabyte and the absence of the this problem in Windows 7. More stuff I tried since replacing the CPU: I have played with BIOS settings - trying different configurations. I also replaced to a new, more adequate PSU. I also tried different RAM sticks and different amounts of them (1, 2 and 4 sticks). I hope that I can be of furter use in making this board/CPU combo rock in Linux. Blessings, Shahar Links: 1. https://docs.google.com/open?id=0BxH2PmBUnzG4ZjQyMzhkOTgtODJhYi00MDZhLTg2MmQtYjU4Yzg3YzJlNzg3 2. http://www.gigabyte.com/support-downloads/cpu-support-popup.aspx?pid=3817 3. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/931353 4. https://perf.wiki.kernel.org/articles/t/u/t/Tutorial.html
glxinfo
Description: Binary data
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