6.12-stable review patch. If anyone has any objections, please let me know.
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From: Eduard Christian Dumitrescu eduard.c.dumitrescu@gmail.com
commit 2b9f84e7dc863afd63357b867cea246aeedda036 upstream.
T495, T495s, and E560 laptops have the FANG+FANW ACPI methods (therefore fang_handle and fanw_handle are not NULL) but they do not actually work, which results in a "No such device or address" error. The DSDT table code for the FANG+FANW methods doesn't seem to do anything special regarding the fan being secondary. The bug was introduced in commit 57d0557dfa49 ("platform/x86: thinkpad_acpi: Add Thinkpad Edge E531 fan support"), which added a new fan control method via the FANG+FANW ACPI methods.
Add a quirk for T495, T495s, and E560 to avoid the FANG+FANW methods. Fan access and control is restored after forcing the legacy non-ACPI fan control method by setting both fang_handle and fanw_handle to NULL.
Reported-by: Vlastimil Holer vlastimil.holer@gmail.com Fixes: 57d0557dfa49 ("platform/x86: thinkpad_acpi: Add Thinkpad Edge E531 fan support") Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219643 Cc: stable@vger.kernel.org Tested-by: Alireza Elikahi scr0lll0ck1s4b0v3h0m3k3y@gmail.com Reviewed-by: Kurt Borja kuurtb@gmail.com Signed-off-by: Eduard Christian Dumitrescu eduard.c.dumitrescu@gmail.com Co-developed-by: Seyediman Seyedarab ImanDevel@gmail.com Signed-off-by: Seyediman Seyedarab ImanDevel@gmail.com Link: https://lore.kernel.org/r/20250324152442.106113-1-ImanDevel@gmail.com Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/platform/x86/thinkpad_acpi.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
--- a/drivers/platform/x86/thinkpad_acpi.c +++ b/drivers/platform/x86/thinkpad_acpi.c @@ -8795,6 +8795,7 @@ static const struct attribute_group fan_ #define TPACPI_FAN_NS 0x0010 /* For EC with non-Standard register addresses */ #define TPACPI_FAN_DECRPM 0x0020 /* For ECFW's with RPM in register as decimal */ #define TPACPI_FAN_TPR 0x0040 /* Fan speed is in Ticks Per Revolution */ +#define TPACPI_FAN_NOACPI 0x0080 /* Don't use ACPI methods even if detected */
static const struct tpacpi_quirk fan_quirk_table[] __initconst = { TPACPI_QEC_IBM('1', 'Y', TPACPI_FAN_Q1), @@ -8825,6 +8826,9 @@ static const struct tpacpi_quirk fan_qui TPACPI_Q_LNV3('N', '1', 'O', TPACPI_FAN_NOFAN), /* X1 Tablet (2nd gen) */ TPACPI_Q_LNV3('R', '0', 'Q', TPACPI_FAN_DECRPM),/* L480 */ TPACPI_Q_LNV('8', 'F', TPACPI_FAN_TPR), /* ThinkPad x120e */ + TPACPI_Q_LNV3('R', '0', '0', TPACPI_FAN_NOACPI),/* E560 */ + TPACPI_Q_LNV3('R', '1', '2', TPACPI_FAN_NOACPI),/* T495 */ + TPACPI_Q_LNV3('R', '1', '3', TPACPI_FAN_NOACPI),/* T495s */ };
static int __init fan_init(struct ibm_init_struct *iibm) @@ -8876,6 +8880,13 @@ static int __init fan_init(struct ibm_in tp_features.fan_ctrl_status_undef = 1; }
+ if (quirks & TPACPI_FAN_NOACPI) { + /* E560, T495, T495s */ + pr_info("Ignoring buggy ACPI fan access method\n"); + fang_handle = NULL; + fanw_handle = NULL; + } + if (gfan_handle) { /* 570, 600e/x, 770e, 770x */ fan_status_access_mode = TPACPI_FAN_RD_ACPI_GFAN;