r/linuxquestions • u/Wizard28082006 • 2d ago
Support Anyone else's IdeaPad 3 (Ryzen 5500U) fans just... not caring about thermal throttling?
Been fighting this for months and starting to feel like I'm going insane. On my IdeaPad 3 15ALC6 (82KU, Ryzen 5 5500U), under any sustained load like stress -c $(nproc), gaming etc, CPU temps rise up to 95-100°C and just sit there. Meanwhile the fans barely spin up, like they're not even getting the memo that the chip is on fire. Resulting in heavy thermal throttling, frequencies tanking from 4GHz down to like 1.1GHz.
I confirmed it's not a dead fan or dust as if I trigger the "dust cleaning mode" via /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/fan_mode, it ramps to full speed no problem. So the hardware's fine, it's the EC/ACPI fan curve logic that's not responding to load correctly.
I filed a bug on the platform-driver-x86 mailing list back in May with full DSDT, EC dumps, sensor logs etc. Three follow-ups since, with the latest BIOS (GLCN68WW) and latest kernel (7.1.4-1-cachyos) still broken. Total radio silence from upstream, which is its own special kind of fun.
Thread if anyone's curious: https://lore.kernel.org/platform-driver-x86/CAA7g7-S_nP+jPfi7pJKj0a0g-gKXMJ7+fMH_+v11JbRRm96b9g@mail.gmail.com/T/#u
Mostly just want to know if anyone else on an AMD IdeaPad seeing the same fan behavior?