search for: pwm_offset

...randomly changing values in the unknown tables of the vbios, I found out that there is a fan calibration table at the offset 0x18 in the BIT P table (version 2). In this table, I identified 2 major 16 bits parameters at offset 0xa and 0xc[2]. The first one, I named pwm_max, while naming the latter pwm_offset. As expected, these parameters look like a mapping function of the form aX + b. However, after gathering more samples, I found out that the output was not continuous when linearly increasing pwm_offset [1]. Even more funnily, the period of this square function is linear with the frequency used for...

...e unknown tables of the vbios, I > found out that there is a fan calibration table at the offset 0x18 in > the BIT P table (version 2). > > In this table, I identified 2 major 16 bits parameters at offset 0xa and > 0xc[2]. The first one, I named pwm_max, while naming the latter > pwm_offset. As expected, these parameters look like a mapping function > of the form aX + b. However, after gathering more samples, I found out > that the output was not continuous when linearly increasing pwm_offset > [1]. Even more funnily, the period of this square function is linear > with the...

...I > > found out that there is a fan calibration table at the offset 0x18 in > > the BIT P table (version 2). > > > > In this table, I identified 2 major 16 bits parameters at offset 0xa and > > 0xc[2]. The first one, I named pwm_max, while naming the latter > > pwm_offset. As expected, these parameters look like a mapping function > > of the form aX + b. However, after gathering more samples, I found out > > that the output was not continuous when linearly increasing pwm_offset > > [1]. Even more funnily, the period of this square function is linea...

...the duty I need to write to get the 100% fan speed (I have cases where I greatly over-estimate it...). Could you please check out the vbios table I am pointing at? I am quite sure that your documentation will be clearer than my babbling :D Thanks, Martin [1] http://fs.mupuf.org/nvidia/fan_calib/pwm_offset.png

...; sure that your documentation will be clearer than my babbling :D Yes. We will check on this. There has been some productive discussion internally, but it will take some more investigation. thanks, John Hubbard > > Thanks, > Martin > > [1] http://fs.mupuf.org/nvidia/fan_calib/pwm_offset.png >

Hey, Thanks for your answer, Andy! On 22/11/17 04:06, Ilia Mirkin wrote: > On Tue, Nov 21, 2017 at 8:29 PM, Andy Ritger <aritger at nvidia.com> wrote: >> Hi Martin, > > Martin should have complete answers, > >> >> I was asked to clarify a few things: >> >> (1) Are all the user reports of loud fans on Fermi-era GPUs? > > Yes. Although I