Recompiling x264 from git worked for me. Requested information:
$ ldd /usr/bin/x264
linux-gate.so.1 => (0x00e68000)
libm.so.6 => /lib/libm.so.6 (0x00b21000)
libpthread.so.0 => /lib/libpthread.so.0 (0x00175000)
libavformat.so.52 => /usr/lib/i686/cmov/libavformat.so.52 (0x00435000)
libswscale.so.0 => /usr/lib/i686/cmov/libswscale.so.0 (0x0061d000)
libavcodec.so.52 => /usr/lib/i686/cmov/libavcodec.so.52 (0x00e69000)
libc.so.6 => /lib/libc.so.6 (0x0018f000)
/lib/ld-linux.so.2 (0x00cbf000)
libavutil.so.50 => /usr/lib/i686/cmov/libavutil.so.50 (0x00860000)
libz.so.1 => /lib/libz.so.1 (0x00983000)
libbz2.so.1.0 => /lib/libbz2.so.1.0 (0x00110000)
libva.so.1 => /usr/lib/libva.so.1 (0x002f1000)
libgsm.so.1 => /usr/lib/libgsm.so.1 (0x00122000)
libschroedinger-1.0.so.0 => /usr/lib/libschroedinger-1.0.so.0
(0x00795000)
libspeex.so.1 => /usr/lib/sse2/libspeex.so.1 (0x00130000)
libtheoraenc.so.1 => /usr/lib/libtheoraenc.so.1 (0x002f8000)
libtheoradec.so.1 => /usr/lib/libtheoradec.so.1 (0x00e44000)
libvorbisenc.so.2 => /usr/lib/libvorbisenc.so.2 (0x00998000)
libvorbis.so.0 => /usr/lib/libvorbis.so.0 (0x0014d000)
libvpx.so.0 => /usr/lib/libvpx.so.0 (0x0033c000)
libdl.so.2 => /lib/libdl.so.2 (0x002ed000)
liborc-0.4.so.0 => /usr/lib/liborc-0.4.so.0 (0x003d8000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00bb7000)
libogg.so.0 => /usr/lib/libogg.so.0 (0x00505000)
$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Celeron(R) CPU E3300 @ 2.50GHz
stepping : 10
cpu MHz : 1203.000
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat
pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc
arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3
cx16 xtpr pdcm xsave lahf_lm dts tpr_shadow vnmi flexpriority
bogomips : 5029.50
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
processor : 1
(...)
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https://bugs.launchpad.net/bugs/684198
Title:
CPU extensions are not detected
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