Clock runs twice as fast when CPU speed is halved on AMD Turion 64 mobile (Compaq Presario V2311US)

Clock runs twice as fast when CPU speed is halved on AMD Turion 64 mobile (Compaq Presario V2311US)

[lutris]

I've an AMD Turion-based laptop, a Compaq Presario V2311US.  It can be
set to two speeds, 800Mhz or 1600Mhz.  When set to 800Mhz, Linux
thinks that time is passing twice as fast as normal - if I let the
laptop sit for an hour, it claims that two have passed.

Are there any known workarounds or fixes for this?

If not, are there any suggestions for dirty hacks?

Hard-coding the kernel to run the clock half as fast would be
sufficient; I never need to set the bus speed to full when in Linux.


Incidentally, I briefly thought that I was getting -fantastic- battery
life, although I was confused about how fast it became midnight.  :] 
Oh, well.

Re: Clock runs twice as fast when CPU speed is halved on AMD Turion 64 mobile (Compaq Presario V2311US)

[lutris]

I found a solution to my clock speed problem.  Apparently Linux can
use a variety of timer sources for the clock, some of which are less
reliable than others.  Appending this kernel parameter fixed the
problem for me:

no_timer_check=0

RE: Clock runs twice as fast when CPU speed is halved on AMD Turion 64 mobile (Compaq Presario V2311US)

[Langsdorf, Mark]

> I've an AMD Turion-based laptop, a Compaq Presario V2311US.  
> It can be set to two speeds, 800Mhz or 1600Mhz.  When set to 
> 800Mhz, Linux thinks that time is passing twice as fast as 
> normal - if I let the laptop sit for an hour, it claims that 
> two have passed.
> 
> Are there any known workarounds or fixes for this?
> 
> If not, are there any suggestions for dirty hacks?
> 
> Hard-coding the kernel to run the clock half as fast would be 
> sufficient; I never need to set the bus speed to full when in Linux.

If your laptop uses the ATI 700 chipset, this is a known
bug with regards to the chipset and we're still trying to
find the best solution to it.  We should have an answer 
by mid-October.

-Mark Langsdorf
AMD, Inc.