[mythtv-users] Video studder XvMC w/OSD

[Krzysztof Adamski]

On Wed, 2008-02-04 at 19:22 -0500, Roger Heflin wrote:
> Mitch Gore wrote:
> >> Yes, i also have the fade turned off.  With OSD Fade checked the stutter
> >> is so bad its unwatchable.  It would be nice to get ride of it completely.
> >> It really ruins the "experience" when you are watching/showing off Myth and
> >> it skips a commercial and everyone is like wow thats cool.  Then it stutters
> >> and looks like piece of junk.
> >>
> >> Mitchell
> >>
> > 
> > After some more investigation I noticed that the BOIS is reconizing the CPU
> > as P4 3.0 ghz but its clock speed is set to 2Ghz.
> > 
> > here is some output:
> > [myth at mythfe ~]$ cat /proc/cpuinfo
> > processor       : 0
> > vendor_id       : GenuineIntel
> > cpu family      : 15
> > model           : 4
> > model name      : Intel(R) Pentium(R) 4 CPU 3.00GHz
> > stepping        : 1
> > cpu MHz         : 1995.506
> > cache size      : 1024 KB
> > physical id     : 0
> > siblings        : 2
> > core id         : 0
> > cpu cores       : 1
> > fdiv_bug        : no
> > hlt_bug         : no
> > f00f_bug        : no
> > coma_bug        : no
> > fpu             : yes
> > fpu_exception   : yes
> > cpuid level     : 5
> > 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 constant_tsc pebs
> > bts sync_rdtsc pni monitor ds_cpl cid xtpr
> > bogomips        : 4008.12
> > clflush size    : 64
> > 
> > processor       : 1
> > vendor_id       : GenuineIntel
> > cpu family      : 15
> > model           : 4
> > model name      : Intel(R) Pentium(R) 4 CPU 3.00GHz
> > stepping        : 1
> > cpu MHz         : 1995.506
> > cache size      : 1024 KB
> > physical id     : 0
> > siblings        : 2
> > core id         : 0
> > cpu cores       : 1
> > fdiv_bug        : no
> > hlt_bug         : no
> > f00f_bug        : no
> > coma_bug        : no
> > fpu             : yes
> > fpu_exception   : yes
> > cpuid level     : 5
> > 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 constant_tsc pebs
> > bts sync_rdtsc pni monitor ds_cpl cid xtpr
> > bogomips        : 3974.91
> > clflush size    : 64
> > 
> > 
> > Maybe i need to update my BIOS.  Or is there some other thing i can change?
> > I looked through BIOS settings but didnt see anything of intrest.
> > 
> > Mitchell
> 
> Updating the bios may be required.
> 
> I have seen motherboards that (for an unknown reason) detect the wrong cpu speed.
> 
> You can try doing a "load failsafe", save and reboot and see what it does, and 
> also a "load optimal" and save and reboot and check it, and also your bios may 
> allow you to set a clock multiplier, if so you can calculate what the multiplier 
> should be for 3.0 Ghz compared to what it currently is for 2.0Ghz, and set it to 
> that.

This has nothing to do with the BIOS, it is the powersaving system that
lowers the CPU clock. Look for cpufreq daemon.

K