AMD FW13 fan behaviour and ramp-up times

Framework Laptop 13 Linux
21

after my temp points config.
7-zip (downloaded from web site, not from Debian repo, and much faster)

7840U and 96GB DDR5-5600

a run from a cool machine, approx 40 degC sensor readings:

% 7z b 8

7-Zip 24.08 (x64) : Copyright (c) 1999-2024 Igor Pavlov : 2024-08-11
 64-bit locale=en_US.UTF-8 Threads:16 OPEN_MAX:1024

Compiler:  ver:14.2.0 GCC 14.2.0 : SSE2
Linux : 6.10.11-amd64 : #1 SMP PREEMPT_DYNAMIC Debian 6.10.11-1 (2024-09-22) : x86_64
PageSize:4KB THP:always hwcap:2 hwcap2:2
AMD Ryzen 7 7840U w/ Radeon  780M Graphics
(A70F41) 

1T CPU Freq (MHz):  4539  4812  4695  4838  5030  5099  5107
8T CPU Freq (MHz): 792% 4828   792% 4854  
16T CPU Freq (MHz): 1335% 3972   1586% 4783  

RAM size:   92337 MB,  # CPU hardware threads:  16
RAM usage:   3559 MB,  # Benchmark threads:     16

                       Compressing  |                  Decompressing
Dict     Speed Usage    R/U Rating  |      Speed Usage    R/U Rating
         KiB/s     %   MIPS   MIPS  |      KiB/s     %   MIPS   MIPS

22:      88208  1544   5556  85809  |     866831  1585   4665  73914
23:      75772  1522   5071  77203  |     770179  1576   4228  66626
24:      73088  1510   5203  78585  |     728693  1534   4169  63937
25:      71975  1514   5427  82178  |     706632  1513   4155  62869
22:      79798  1513   5131  77628  |     763827  1545   4215  65131
23:      74359  1499   5056  75764  |     756561  1560   4197  65448
24:      72263  1501   5175  77697  |     730948  1540   4165  64135
25:      71568  1516   5389  81715  |     711045  1529   4138  63262
22:      80043  1523   5112  77866  |     758626  1538   4206  64688
23:      75216  1509   5079  76637  |     757748  1564   4192  65551
24:      72303  1509   5152  77740  |     718334  1520   4146  63028
25:      71439  1515   5383  81567  |     696083  1501   4125  61931
22:      79336  1510   5112  77179  |     765934  1559   4188  65311
23:      75814  1517   5090  77245  |     768439  1578   4212  66475
24:      74313  1534   5209  79902  |     757895  1590   4182  66499
25:      70780  1502   5381  80814  |     729197  1570   4133  64877
22:      77399  1495   5038  75294  |     745900  1515   4197  63603
23:      75496  1518   5067  76922  |     758595  1573   4172  65624
24:      68814  1475   5015  73990  |     737877  1570   4125  64743
25:      72092  1532   5371  82313  |     708815  1549   4071  63064
22:      78572  1520   5027  76436  |     752961  1571   4087  64205
23:      73832  1508   4989  75227  |     740390  1577   4062  64049
24:      72157  1520   5104  77584  |     729466  1587   4034  64005
25:      70641  1520   5308  80656  |     715841  1590   4005  63689
22:      77780  1517   4988  75664  |     714286  1518   4012  60907
23:      74118  1525   4952  75518  |     726006  1571   3998  62805
24:      69919  1494   5033  75177  |     706880  1576   3934  62023
25:      69304  1524   5192  79129  |     697355  1588   3906  62044
22:      75681  1499   4913  73623  |     701399  1524   3924  59808
23:      72754  1523   4866  74128  |     709505  1556   3944  61377
24:      70632  1523   4987  75945  |     708841  1584   3928  62195
25:      69415  1523   5206  79256  |     693458  1579   3907  61697
----------------------------------  | ------------------------------
Avr:     74215  1514   5143  77887  |     735455  1557   4113  64048
Tot:            1536   4628  70967

another run from a hot machine, 80 degC CPU and 50 degC other sensor readings:

7z b 8
.
.
.
Avr:     71695  1506   5000  75279  |     711054  1568   3949  61927
Tot:            1537   4474  68603

readings

--sensor name -------- temperature -------- ratio (fan_off and fan_max) --
local_f75303@4d       329 K (= 56 C)          80% (313 K and 333 K)
cpu_f75303@4d         326 K (= 53 C)          65% (313 K and 333 K)
ddr_f75303@4d         321 K (= 48 C)          40% (313 K and 333 K)
cpu@4c                354 K (= 81 C)         100% (313 K and 353 K)
22 
$ ectool thermalget

sensor  warn  high  halt   fan_off fan_max   name
  0      343   353    393    313     343     local_f75303@4d
  1      343   353    393    319     327     cpu_f75303@4d
  2      343   353    393    401     401     ddr_f75303@4d
  3      381   388    400    376     378     cpu@4c
(all temps in degrees Kelvin)

This is the default setting.

When the temperature reaches Warn, the power is cut significantly. My interpretation is that the CPU can be used at 100C but other components cannot so when sensor 0 1 and 2 reaches 343K something needs to be done to prevent overheat damage. I found that if you

ectool thermalset 3 370 380 390 333 363

The power, frequency and fan speed will go all over the place as the CPU powers down when reaching 97C then powers up again when below 97W and fan speed fluctuate as the result. If you stress all cores nothing will happen, but if you stress one core or half of the cores, the power will be cut when the hottest core reaches 97C even if the idling cores are only 60~ish Celsius(AMD only displays the hottest core and the thermal conductivity between cores are worse than Intel). After adjusting to

ectool thermalset 3 381 388 400 333 363

The CPU power goes back to default while the fan still works as intended(faster reaction)
Here’s the comparison using $ stress -c 4 -t 30

thermalsetcomparison
thermalsetcomparison2210×1269 221 KB

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