Hello, I have an AMD Athlon(tm) II X4 635 Processor on an asus M4A89TD PRO/USB3 motherboard with AMD 890FX chipset. When I play videos on nvidia card (even on open source driver) the video stutters and I can see in syslog:
Feb 24 00:30:50 virtual1 kernel: [ 719.834878] CPU 1 is now offline Feb 24 00:30:50 virtual1 kernel: [ 719.842450] CPU 2 is now offline Feb 24 00:30:50 virtual1 kernel: [ 719.852534] CPU 3 is now offline Feb 24 00:30:50 virtual1 kernel: [ 719.852538] SMP alternatives: switching to UP code Feb 24 00:30:51 virtual1 /usr/sbin/irqbalance: WARNING, didn't collect load info for all cpus, balancing is broken Feb 24 00:30:52 virtual1 kernel: [ 722.294565] SMP alternatives: switching to SMP code Feb 24 00:30:52 virtual1 kernel: [ 722.334866] Booting Node 0 Processor 1 APIC 0x1 Feb 24 00:30:52 virtual1 kernel: [ 722.346033] LVT offset 1 assigned for vector 0x400 Feb 24 00:30:52 virtual1 kernel: [ 722.361174] Switch to broadcast mode on CPU1 Feb 24 00:30:52 virtual1 kernel: [ 722.378717] microcode: CPU1: new patch_level=0x010000db Feb 24 00:30:52 virtual1 kernel: [ 722.398515] Booting Node 0 Processor 2 APIC 0x2 Feb 24 00:30:52 virtual1 kernel: [ 722.413375] Switch to broadcast mode on CPU2 Feb 24 00:30:52 virtual1 kernel: [ 722.420603] microcode: CPU2: new patch_level=0x010000db Feb 24 00:30:52 virtual1 kernel: [ 722.428782] Booting Node 0 Processor 3 APIC 0x3 Feb 24 00:30:52 virtual1 kernel: [ 722.446283] Switch to broadcast mode on CPU3 Feb 24 00:30:52 virtual1 kernel: [ 722.448615] microcode: CPU3: new patch_level=0x010000db I have searched on internet and I see that is a problem common to several AMD platforms. Even in Microsoft Windows several people have the same problem and they solved it disabling cool&quiet on bios. It seems that some amd cpus on power saving cut off also HT bus blocking data from pcie bus (!?!) I have tried too and infact disabling cool&quiet improves a lot the problem. But I would like to find a better solution, can I disable cpu hotplug? Have you heard of this bug before? Please CC me because I am not on kernel mailing list. Thanks in advance for any help, Mario -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
