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Re: [PATCH v11] platform/x86: bitland-mifs-wmi: Add new Bitland MIFS WMI driver To: =?UTF-8?Q?Milo=C5=A1_Vlku?= , qby140326@gmail.com Cc: platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org References: Content-Language: en-US From: Armin Wolf In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:5QRZnGvP5PsWlWjzLSWhLFWVaNoY5oI6DRcGsMNmFv+BSnbZpnv 2Wj5A2Icg8qLi/g5VvQD7rkM1vcMQMHjJfjwMcOHZ+CRRimPNUwqzBzFRYp0sb0HtVhPPdF GXJ7ILTei7uc/DnDFd99c0x3XX8b29Nbywt4je8iLXElWzrvIA/u3iiSGrmdW47sKTd0BI+ xCKjXJz1Il6pRsFqlD0TQ== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:fCptRd/E2Hg=;4BKHLLqZiVMqmiIB7enMlkYCtcU RSgW2PIVF6o2LVMr63edGxyfSgI/pStZvf9bXplDTzoikcZzXa3tZ5iGQ4hvVZt0n66bPpvqA r+h8uMODCC49j+e1YFWjOSY/bHCLN1s+V5tJGk7MneWMHZKTtonl2rEDDBYdgWNgRHIDQzkZG AfTBa5j+6FZgJ9F+hwWlo4h1vVEV98/jkYfOn9k+XSatre7IrtotEuhR6IPXpRfuPzEJ/V+Yx kcUf7v3t4G0Z+gO2uZCMsu+94NTFb5AWVGFEVQbexrzwWkDSXh9xxguXH3DJnMIzPTp//qPEE 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mFYvmntC4PjQkC0tr35F0wgKcZXxp35UQc+YwqMAJep1tsS3L/dPF3KYrJ6V663LlUax6hBAu f9DkmCBXdZbCnlHu43VtKAoG+XF//1/d96e4L75u6KuK9e0wRm6MSQtvBB87BB/SYcoY0/Xb7 OOjCtTWytpBmqzei9WiMyEgImIllJ1i4glH0zbXF6SMXT+ote/kh13eyPIwLLs1/snYd5cdXK MDC9LG8qm4HPQ7VRzFohYIOVUwTBr3dhHu6EwuHSTiuutrNW8q62N/e2f62NnMd/2k6pbHoZ7 aBZNL78fMjN6AJtj+KpDu8Iln2zBIEH379A1skuSRDIt4M0EL1MX/4qCE5sCv3942rwUgCzLo qlJ1D/egp3HfgVGvlen6JLbSE6kWebdDZ+zC2YBB4HZWBbPWBWYDSK2OGbLu6/cwZxV0k0YK0 FBOnc1+bXqka5nPR4an98JlJ43zQo5brnnmyDOeofBQyF0cEOde0oBT2/zw3U6zmkyh+RqqOm 6d1EzLmvQr6ZeojXDJDwh/HtHZejbx+t82DATDR9W9nlixFUrhOxtx5y3NjHGsMStzNtuv/yt k0epdxgY/LgRwySn19dTxGrLKmdtFyy3lTHtE9Unds2Vk7R7dDNuvYfiw4rb21oJTRCtBmhJX ztorxUG8cfuKMdD1RvJheEq8Mn9/Gx5nde2fiACNK/4xVhvxjYHbq02I2MCmV+Gj5/3m3hBZY qOrx3sqA5UpbCtwZAhbXKlaPlV1U9NbhFKBrWEyNcFibiLzZIPY0LVJIi57GU8EvIllpbewR6 e21s+K68ZsI= Am 15.08.26 um 09:15 schrieb Milo=C5=A1 Vlku: > Hi, > > Thanks for the work on this driver. I'm testing it on a laptop that isn'= t > in your reverse-engineering set, and wanted to report that fan control > seems to be a no-op here even though everything else (sensors, gpu_mode, > platform-profile read, kb backlight) looks fine. > > Hardware: > - Model: Xiaomi Redmi Book Pro 14 2024, board TM2307 > - BIOS: V24C1, dated 06/10/2025 > - CPU: Intel Core Ultra 5 125H > - Kernel: 7.1.8-1-cachyos (Arch/CachyOS) > > Problem: > Fans (CPU/GPU/SYS, as reported by the bitland_mifs hwmon block) never sp= in > under Linux, even at CPU package temps of 62-63C (coretemp). Confirmed v= ia > dual-boot that the fans work correctly under Windows, so this isn't a > hardware fault. > > What I tried: > > 1. `fan_boost` sysfs attribute (WMI cmd 0x14, MaxFanSpeedSwitch): > echo 1 | sudo tee .../B60BFB48-3E5B-49E4-A0E9-8CFFE1B3434B-4/fan_b= oost > - Write succeeds with no error. > - fan1/2/3_input under hwmon (bitland_mifs) stay at 0 RPM. > - No audible/physical change. > > 2. Enabled dynamic debug on the module to trace notify events: > echo 'module bitland_mifs_wmi +p' | sudo tee > /sys/kernel/debug/dynamic_debug/control > - Confirmed pr_debug call sites are active (bitland_mifs_wmi_notify, > bitland_mifs_wmi_resume). > - Retried the fan_boost write with tracing on: no notify/state-chang= e/ > WMI event lines appear in dmesg at all in response to the write. > > 3. Tried the standard mainline ACPI fan interface instead (bypassing thi= s > driver entirely). 5x PNP0C0B cooling devices are present > (cooling_device0-4, type=3DFan, max_state=3D1): > for i in 0 1 2 3 4; do echo 1 | sudo tee > /sys/class/thermal/cooling_device$i/cur_state; done > - All 5 confirmed set to cur_state=3D1 on readback. > - Still zero RPM change, no audible response. > > 4. Noted a mismatch: the acpitz thermal zone that ACPI trip points are > bound to reads ~27C (presumably a chassis/skin sensor) while coretem= p > reads 60C+, so even automatic/EC-driven fan curves triggered via tha= t > zone would never fire under Linux regardless of the WMI driver. > > Conclusion so far: > Both the new fan_boost control and the standard ACPI PNP0C0B cur_state > override are complete no-ops on this specific model/firmware, with zero = EC > acknowledgment visible even with driver tracing on. Since Windows drives > the fans fine, the EC likely requires some additional init/handshake/ > enable step (that the Windows vendor driver performs) which neither Linu= x > path is triggering. Given the driver's docs mention it was reverse- > engineered primarily against Lenovo-rebadged Bitland units, I suspect th= is > Xiaomi/Redmi variant has a different EC command mapping or requires an > additional enable call not yet implemented. > > WMI GUIDs present on this machine, for reference: > - B60BFB48-3E5B-49E4-A0E9-8CFFE1B3434B (control methods, hosts > fan_boost/gpu_mode/platform-profile/kb_mode/hwmon) > - 46C93E13-EE9B-4262-8488-563BCA757FEF (event notifications) > - 3F9E3C26-B077-4F86-91F5-37FF64D8C7ED > - 1DCEAF0A-4D63-44BB-BD0C-0D6281BFDDC5 > - FA78E245-2C0F-4CA1-91CF-15F34E474850 > - 05901221-D566-11D1-B2F0-00A0C9062910 (multiple instances, standard BMO= F) > - A6FEA33E-DABF-46F5-BFC8-460D961BEC9F > - F80A5498-23F3-4053-A244-B39067EC476F > - 1F13AB7F-6220-4210-8F8E-8BB5E71EE969 > - 2BC49DEF-7B15-4F05-8BB7-EE37B9547C0B > - 657B6048-310C-4A90-A211-10A17922A0AF > > Happy to test patches, dump ACPI tables (DSDT/SSDT), pull the Windows > driver's WMI call sequence via API Monitor, or gather any other debug > info that would help. This looks like a useful data point for broadening > hardware support on this model, so just let me know what's most useful t= o > collect next. > > Thanks, > Milos Sorry for the late reply. Could you please share the output of "acpidump"? Thanks, Armin Wolf