[Libva] Full HD h264 choppy on Core i5 M 520 (nehalem)

[dE]

Hi!
     I got this CPU an old laptop --

|processor : 0||
||vendor_id : GenuineIntel||
||cpu family      : 6||
||model : 37||
||model name      : Intel(R) Core(TM) i5 CPU       M 520  @ 2.40GHz||
||stepping : 2||
||microcode : 0x9||
||cpu MHz         : 1199.000||
||cache size      : 3072 KB||
||physical id     : 0||
||siblings : 4||
||core id         : 0||
||cpu cores       : 2||
||apicid : 0||
||initial apicid  : 0||
||fpu : yes||
||fpu_exception : yes||
||cpuid level     : 11||
||wp : yes||
||flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx 
rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology 
nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est 
tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt aes lahf_lm ida arat 
dtherm tpr_shadow vnmi flexpriority ept vpid||
||bogomips : 4788.28||
||clflush size    : 64||
||cache_alignment : 64||
||address sizes   : 36 bits physical, 48 bits virtual||
||power management:||
||
||processor : 1||
||vendor_id : GenuineIntel||
||cpu family      : 6||
||model : 37||
||model name      : Intel(R) Core(TM) i5 CPU       M 520  @ 2.40GHz||
||stepping : 2||
||microcode : 0x9||
||cpu MHz         : 1199.000||
||cache size      : 3072 KB||
||physical id     : 0||
||siblings : 4||
||core id         : 0||
||cpu cores       : 2||
||apicid : 1||
||initial apicid  : 1||
||fpu : yes||
||fpu_exception : yes||
||cpuid level     : 11||
||wp : yes||
||flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx 
rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology 
nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est 
tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt aes lahf_lm ida arat 
dtherm tpr_shadow vnmi flexpriority ept vpid||
||bogomips : 4788.28||
||clflush size    : 64||
||cache_alignment : 64||
||address sizes   : 36 bits physical, 48 bits virtual||
||power management:||
||
||processor : 2||
||vendor_id : GenuineIntel||
||cpu family      : 6||
||model : 37||
||model name      : Intel(R) Core(TM) i5 CPU       M 520  @ 2.40GHz||
||stepping : 2||
||microcode : 0x9||
||cpu MHz         : 1199.000||
||cache size      : 3072 KB||
||physical id     : 0||
||siblings : 4||
||core id         : 2||
||cpu cores       : 2||
||apicid : 4||
||initial apicid  : 4||
||fpu : yes||
||fpu_exception : yes||
||cpuid level     : 11||
||wp : yes||
||flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx 
rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology 
nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est 
tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt aes lahf_lm ida arat 
dtherm tpr_shadow vnmi flexpriority ept vpid||
||bogomips : 4788.28||
||clflush size    : 64||
||cache_alignment : 64||
||address sizes   : 36 bits physical, 48 bits virtual||
||power management:||
||
||processor : 3||
||vendor_id : GenuineIntel||
||cpu family      : 6||
||model : 37||
||model name      : Intel(R) Core(TM) i5 CPU       M 520  @ 2.40GHz||
||stepping : 2||
||microcode : 0x9||
||cpu MHz         : 1199.000||
||cache size      : 3072 KB||
||physical id     : 0||
||siblings : 4||
||core id         : 2||
||cpu cores       : 2||
||apicid : 5||
||initial apicid  : 5||
||fpu : yes||
||fpu_exception : yes||
||cpuid level     : 11||
||wp : yes||
||flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx 
rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology 
nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est 
tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt aes lahf_lm ida arat 
dtherm tpr_shadow vnmi flexpriority ept vpid||
||bogomips : 4788.28||
||clflush size    : 64||
||cache_alignment : 64||
||address sizes   : 36 bits physical, 48 bits virtual||
||power management:|

i965 driver is installed --

libva info: VA-API version 0.39.2
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_0_39
libva info: va_openDriver() returns 0
vainfo: VA-API version: 0.39 (libva 1.4.1)
vainfo: Driver version: Intel i965 driver for Intel(R) Ironlake Mobile - 
1.7.1
vainfo: Supported profile and entrypoints
       VAProfileMPEG2Simple            : VAEntrypointVLD
       VAProfileMPEG2Main              : VAEntrypointVLD
       VAProfileH264ConstrainedBaseline: VAEntrypointVLD
       VAProfileH264Main               : VAEntrypointVLD
       VAProfileH264High               : VAEntrypointVLD
       VAProfileNone                   : VAEntrypointVideoProc

Running on Debian 8 (packages upgraded from unstabled/sid).
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