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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Embedded Controller does not read temperatures continuously, leading to no fan control","articleBody":"Hello!\n\nSince some time I noticed that my Framework Laptop 13 AMD 7840U gets really hot. Uncomfortably hot. Also, I noticed that there's no fan spin at all, if that happens. But, also, I notice fan spins from time to time, often also full speed. \n\nThe laptop runs Archlinux, the latest BIOS firmware, although I noticed this also with previous versions.\n\nI used `ectool` and `framework_tool` to investigate and found, that neither tool updates its reported temperatures under load (compiling or `s-tui` stress mode) and thus the EC does not see the necessity to spin up the fans according to the limits. And, expectedly, this leads to CPU throttling and a burning hot chassis. \n\nI observed that after a fresh boot, the report of CPU temperatures can occasionally be Zero (0 °C) for all reported temperatures. Also after a suspend/wake cycle this might fix itself. Sometimes after a shortish period of time (\u003c 2 min) the EC reads temperatures, however, recorded temperatures remain static, irrespective of CPU load. Sometimes it simply does not. Once I repeat a sleep/wake cycle, the temperature often updates and spins up the fan if needed, which I almost always the case, and the fans will go full blast to cool down the APU.\n\n\nSince, the dropping temperature after ending the load will also not be noticed by the EC, the fan will stay on full-blast indefinitely, or until I suspend the laptop again.\n\nThis behavior has been observed for battery or AC mode.  \n\nCould you please tell me where to look further for logs or details, why the EC is stuck in its temperature measurements? \n\nMy understanding would be, that there is a continuous measurement. E.g. like all the other sensors that `sensors` reports. \n\nAttachments:\n\nEC version:\n\n```\nworkframe in ~\n✗ sudo framework_tool --versions\nMainboard Hardware\n  Type:           Laptop 13 (AMD Ryzen 7040Series)\n  Revision:       MassProduction\nUEFI BIOS\n  Version:        03.09\n  Release Date:   04/22/2025\nEC Firmware\n  Build version:  azalea_v3.4.113385-ec:c25dec,os:7b88e1,cmsis:4aa3ff 2025-04-14 01:55:38 marigold1@ip-172-26-3-226\n  Current image:  RO\nPD Controllers\n  Right (01):       0.0.1C (MainFw)\n  Left  (23):       0.0.1C (MainFw)\nTouchpad\n  Firmware Version: v0704\nHDMI Expansion Card\n  Active Firmware:  106 (3.0.10.06A, MainFw)\n\nworkframe in ~ took 0s\n❯ sudo ectool version\nRO version:    azalea_v3.4.113385-ec:c25dec,os\nRW version:    azalea_v3.4.113385-ec:c25dec,os\nFirmware copy: RO\nBuild info:    azalea_v3.4.113385-ec:c25dec,os:7b88e1,cmsis:4aa3ff 2025-04-14 01:55:38 marigold1@ip-172-26-3-226\nTool version:  0.0.1-isolate Apr 30 2025 none\n```\n\nNo reporting of Temperatures after Boot/Sleep/Wake Cycle:\n```\nEvery 1.0s: sudo framework_tool -vvvvv --thermal                                                                                                                                      workframe: 02:21:31 AM\n                                                                                                                                                                                               in 0.019s (0)\n[DEBUG] Chromium EC Driver: CrosEc\n[TRACE] get_smbios() linux entry\n[DEBUG] read_memory(offset=0x0, size=0xF)\n[DEBUG] read_memory(offset=0x10, size=0x8)\n  F75303_Local: 0 C\n  F75303_CPU:   0 C\n  F75303_DDR:   0 C\n  APU:          Error\n  Fan Speed:     0 RPM\n[INFO ]   Fan Speed:    Not present\n[INFO ]   Fan Speed:    Not present\n[INFO ]   Fan Speed:    Not present\n```\n\nOn AC/battery readout after successful suspend/wake cycle. Initial state prior to the next two pictures. \n```\nworkframe in ~\n❯ sudo framework_tool -vvvvv --thermal\n[DEBUG] Chromium EC Driver: CrosEc\n[TRACE] get_smbios() linux entry\n[DEBUG] read_memory(offset=0x0, size=0xF)\n[DEBUG] read_memory(offset=0x10, size=0x8)\n  F75303_Local: 42 C\n  F75303_CPU:   43 C\n  F75303_DDR:   42 C\n  APU:          Error\n  Fan Speed:  2340 RPM\n[INFO ]   Fan Speed:    Not present\n[INFO ]   Fan Speed:    Not present\n[INFO ]   Fan Speed:    Not present\n```\n\nSystem in `s-tui` stress mode after the intial setup:\n![Image](https://github.com/user-attachments/assets/c7b49214-e482-44ca-b667-b4bccc47eb35)\n\nSystem still in stress mode, after suspend/wake cycle. Temperatures got updated, fans immediately ramp up to cool the CPU. Also notice the 500 MHz increase in clock speed once the fans provide more cooling.\n![Image](https://github.com/user-attachments/assets/27bba429-b8e8-4817-9f50-47b1dcd96a85)","author":{"url":"https://github.com/depate","@type":"Person","name":"depate"},"datePublished":"2025-07-02T00:15:18.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":25},"url":"https://github.com/69/EmbeddedController/issues/69"}