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    SubjectRe: Linux 2.6.38.4 : regression due to x86 AMD ARAT feature
    Borislav Petkov wrote, on 04/24/11 20:20:
    > On Sun, Apr 24, 2011 at 10:06:36AM +0200, Jörg-Volker Peetz wrote:
    >> With 2.6.38.4 the clock slows down and the affected laptop sometimes, e.g. for
    >> the output of "ps axuw" to appear, needs an input from the keyboard or the
    >> touchpad. Please find attached the kernel config file and the output of dmesg.
    >>
    >> Commenting out the the lines
    >>
    >> if (c->x86 >= 0xf && !cpu_has_amd_erratum(amd_erratum_400))
    >> set_cpu_cap(c, X86_FEATURE_ARAT);
    >>
    >> in arch/x86/kernel/cpu/amd.c makes this laptop work as before with kernel
    >> 2.6.38.3. I think these lines came with commit
    >> d7b7f0c401303dd7eafcff11752fe74d3b75c766.
    >
    > Hmm, interesting.
    >
    > Can you send also /proc/cpuinfo please?
    >
    > Looks like your CPU is a single core K8 revE or something but we'd need
    > the exact family info.
    >
    > Thanks.
    >

    Here it comes:


    processor : 0
    vendor_id : AuthenticAMD
    cpu family : 15
    model : 36
    model name : AMD Turion(tm) 64 Mobile Technology MT-40
    stepping : 2
    cpu MHz : 800.000
    cache size : 1024 KB
    fpu : yes
    fpu_exception : yes
    cpuid level : 1
    wp : yes
    flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36
    clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt lm 3dnowext 3dnow rep_good
    nopl pni lahf_lm
    bogomips : 1592.98
    TLB size : 1024 4K pages
    clflush size : 64
    cache_alignment : 64
    address sizes : 40 bits physical, 48 bits virtual
    power management: ts fid vid ttp tm stc

    This is a nice mobile processor and i thought it was sold quite a lot.
    --
    Best regards,
    Jörg-Volker.
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