├── .gitignore ├── Makefile ├── README.md ├── dellfan.c └── COPYING /.gitignore: -------------------------------------------------------------------------------- 1 | dellfan 2 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | #!/usr/bin/make -f 2 | 3 | all: dellfan 4 | 5 | dellfan: dellfan.c 6 | $(CC) -o $@ $^ 7 | 8 | clean: 9 | rm -f dellfan 10 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | dellfan - user space utility to control the fan speed on Dell Laptops. 2 | ====================================================================== 3 | 4 | * Allows to set the fan speed of a Dell laptop to 0 (disabled), 1 (medium) and 2 (full speed). 5 | 6 | 7 | Caveats 8 | ------- 9 | 10 | * The BIOS of some newer Dell laptops (Latitude E6420/E6520/E6430/E6530/E6440/E6540/...) 11 | will override the speed you set unless you disable the BIOS control. 12 | * I found two methods of disabling the BIOS control: 13 | * By default ``DISABLE_BIOS_METHOD1`` will be used. 14 | * If you want to try ``DISABLE_BIOS_METHOD2`` edit the source code. 15 | * On my laptop (E6420), when you disable the BIOS control over the fan some weird things happen: 16 | * The Fn keys stop working. 17 | * Suspend to RAM sometimes stops working: The laptop will power itself off instead of suspending. 18 | * This happens every time on the M4600. The solution is running `dellfan 0 0` before putting the machine to sleep. 19 | * Please, if you find a new method of disabling the BIOS control, let me know it. 20 | * There is a function that allows to discover new codes by proving (use with care). 21 | -------------------------------------------------------------------------------- /dellfan.c: -------------------------------------------------------------------------------- 1 | /* 2 | * dellfan - user space utility to control the fan speed on Dell Laptops. 3 | * 4 | * SMM Management code from i8k. See file drivers/char/i8k.c at Linux kernel. 5 | * 6 | * Copyright (C) 2001 Massimo Dal Zotto 7 | * Copyright (C) 2014 Carlos Alberto Lopez Perez 8 | * 9 | * This program is free software; you can redistribute it and/or modify 10 | * it under the terms of the GNU General Public License as published by 11 | * the Free Software Foundation; either version 2 of the License, or 12 | * (at your option) any later version. 13 | * 14 | * This program is distributed in the hope that it will be useful, 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 | * GNU General Public License for more details. 18 | * 19 | * You should have received a copy of the GNU General Public License 20 | * along with this program; if not, see . 21 | * 22 | */ 23 | 24 | 25 | #include 26 | #include 27 | #include 28 | #include 29 | 30 | /* This is some information about the codes for different functions on the Dell SMBIOS */ 31 | 32 | /* 33 | http://brouille.tuxfamily.org/junk/fan.c 34 | cmd function (thanks to Andrew Paprocki) 35 | 0x00a3 get current speed indicator of a fan (args: fan) 36 | 0x01a3 set speed of a fan (args: fan & speed) 37 | 0x02a3 get RPM of a fan (args: fan) 38 | 0x03a3 ??? (1 byte) 39 | 0x04a3 get nominal fan speed (2 args) 40 | 0x05a3 get fan tolerance speed (2 args) 41 | 0x10a3 get sensor temperature (1 arg: sensor#) 42 | 0x11a3 ??? 43 | 0x12a3 arg 0x0003=NBSVC-Query 44 | arg 0x0000=NBSVC-Clear 45 | arg 0x122=NBSVC-Start Trend 46 | arg 0x0100=NBSVC-Stop Trend 47 | arg 0x02??=NBSVC-Read 48 | 0x21a3 ??? (2 args: 1 byte (oder 0x16) + 1 byte) 49 | 0x22a3 get charger info (1 arg) 50 | 0x23a3 ??? (4 args: 2x 1 byte, 1xword, 1xdword) 51 | 0x24a3 get adaptor info status (1 arg oder 0x03) 52 | 0x30a3 ??? (no args) 53 | 0x31a3 ??? (no args) 54 | 0x32a3 ??? (no args) 55 | 0x33a3 ??? (no args) 56 | 0x36a3 get hotkey scancode list (args see diags) 57 | 0x37a3 ??? (no args) 58 | 0x40a3 get docking state (no args) 59 | 0xf0a3 ??? (2 args) 60 | 0xfea3 check SMBIOS version (1 arg) 61 | 0xffa3 check SMBIOS interface (returns:"DELLDIAG") 62 | */ 63 | 64 | /* The codes for DISABLE_BIOS_* were obtained experimentally on a E6420 with the 65 | * following algorithm: 66 | * probing many codes in a loop 67 | * putting the speed to maximum, sleeping some seconds, and checking the speed back. 68 | * Check the function probecodes() 69 | */ 70 | #define DISABLE_BIOS_METHOD1 0x30a3 71 | #define ENABLE_BIOS_METHOD1 0x31a3 72 | #define DISABLE_BIOS_METHOD2 0x34a3 73 | #define ENABLE_BIOS_METHOD2 0x35a3 74 | #define ENABLE_FN 0x32a3 75 | #define SET_FAN 0x01a3 76 | #define GET_FAN 0x00a3 77 | #define FN_STATUS 0x0025 78 | 79 | void init_ioperm(void) 80 | { 81 | if (ioperm(0xb2, 4, 1) || ioperm(0x84, 4, 1)) { 82 | perror("ioperm"); 83 | exit(EXIT_FAILURE); 84 | } 85 | } 86 | 87 | struct smm_regs { 88 | unsigned int eax; 89 | unsigned int ebx __attribute__ ((packed)); 90 | unsigned int ecx __attribute__ ((packed)); 91 | unsigned int edx __attribute__ ((packed)); 92 | unsigned int esi __attribute__ ((packed)); 93 | unsigned int edi __attribute__ ((packed)); 94 | }; 95 | 96 | static int i8k_smm(struct smm_regs *regs) 97 | { 98 | int rc; 99 | int eax = regs->eax; 100 | 101 | 102 | asm volatile("pushq %%rax\n\t" 103 | "movl 0(%%rax),%%edx\n\t" 104 | "pushq %%rdx\n\t" 105 | "movl 4(%%rax),%%ebx\n\t" 106 | "movl 8(%%rax),%%ecx\n\t" 107 | "movl 12(%%rax),%%edx\n\t" 108 | "movl 16(%%rax),%%esi\n\t" 109 | "movl 20(%%rax),%%edi\n\t" 110 | "popq %%rax\n\t" 111 | "out %%al,$0xb2\n\t" 112 | "out %%al,$0x84\n\t" 113 | "xchgq %%rax,(%%rsp)\n\t" 114 | "movl %%ebx,4(%%rax)\n\t" 115 | "movl %%ecx,8(%%rax)\n\t" 116 | "movl %%edx,12(%%rax)\n\t" 117 | "movl %%esi,16(%%rax)\n\t" 118 | "movl %%edi,20(%%rax)\n\t" 119 | "popq %%rdx\n\t" 120 | "movl %%edx,0(%%rax)\n\t" 121 | "pushfq\n\t" 122 | "popq %%rax\n\t" 123 | "andl $1,%%eax\n" 124 | :"=a"(rc) 125 | : "a"(regs) 126 | : "%ebx", "%ecx", "%edx", "%esi", "%edi"); 127 | 128 | if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax) 129 | return -1; 130 | 131 | return 0; 132 | } 133 | 134 | 135 | int send(unsigned int cmd, unsigned int arg) { 136 | 137 | struct smm_regs regs = { .eax = cmd, }; 138 | 139 | regs.ebx = arg; 140 | 141 | i8k_smm(®s); 142 | return regs.eax ; 143 | 144 | } 145 | 146 | /* sets the speed and returns the speed of the fan after that */ 147 | int set_speed(int speed) { 148 | 149 | if ( speed == 0 ) { 150 | send(SET_FAN,0x0000); 151 | } else if ( speed == 1 ) { 152 | send(SET_FAN,0x0100); 153 | } else if ( speed == 2 ) { 154 | send(SET_FAN,0x0200); 155 | } else { 156 | printf("Ignoring unknown speed: %d\n",speed); 157 | } 158 | // return the speed the fan has now 159 | return send(GET_FAN,0); 160 | } 161 | 162 | 163 | int probecodes (void) { 164 | 165 | printf("Please tune the startcode by editing the source code\n"); 166 | /* Remove the following exit call to enable this routine. 167 | * 168 | * *WARNING:* Proving for random codes in the SMBIOS management can 169 | * cause unexpected behaviour (even crashes or data loss) on your machine. 170 | * 171 | * USE AT YOUR OWN RISK!! 172 | */ 173 | exit(EXIT_FAILURE); 174 | 175 | /* If you want to test this fast, use startcode=0x30a0 (for example) 176 | * and you should see that the code 0x30a3 is detected. 177 | * If you want to test all the codes then use startcode=0x0000 but 178 | * this will take a while. 179 | */ 180 | int startcode=0x0001; 181 | int fanstatus, trycode; 182 | 183 | // Set the speed to 2, sleep 3 seconds and get the speed of the fan 184 | set_speed(2); 185 | sleep(3); 186 | fanstatus = send(GET_FAN,0); 187 | if (fanstatus == 2 ) { 188 | printf ("Your fan status is already set to full speed.\n" 189 | "In order for this to work, please set it to auto (enable BIOS control)\n" 190 | "And stop any process that is consuming CPU resources\n"); 191 | exit(EXIT_FAILURE); 192 | } 193 | 194 | for (trycode=startcode; trycode <= 0xFFFF; trycode++) { 195 | printf ("Probing code: %#06x\n",trycode); 196 | // Send the code 197 | send(trycode,0); 198 | // Set the speed to 2, sleep 3 seconds and get the speed of the fan 199 | set_speed(2); 200 | sleep(3); 201 | fanstatus = send(GET_FAN,0); 202 | // If the fan is still 2 this is because the previous code disabled 203 | // the BIOS control of the fan. 204 | // Please ensure that your system is idle when running this (otherwise 205 | // the BIOS could set the fan to max speed to cool down your system 206 | // because of the load) 207 | if (fanstatus == 2 ) { 208 | printf ("The code %#06x disabled the FAN control!!!\n",trycode); 209 | printf ("Enabling BIOS control back...\n"); 210 | send(ENABLE_BIOS_METHOD1,0); 211 | sleep(3); 212 | fanstatus = send(GET_FAN,0); 213 | if (fanstatus == 2 ) { 214 | printf ("ERROR: Unable to bring BIOS control back.\n"); 215 | exit (EXIT_FAILURE); 216 | } 217 | } 218 | } 219 | } 220 | 221 | 222 | int main(int argc, char **argv) { 223 | 224 | int speed, disable; 225 | unsigned int tries; 226 | unsigned int xarg; 227 | 228 | if (geteuid() != 0) { 229 | printf("need root privileges\n"); 230 | exit(EXIT_FAILURE); 231 | } 232 | 233 | if (argc < 2) { 234 | printf ("Use: %s speed [disable]\n",argv[0]); 235 | printf ("\tspeed = {0,1,2}\n"); 236 | printf ("\t\t\t[Use speed=9 to probe for SMBIOS codes to disable the BIOS fan control.]\n"); 237 | printf ("\tdisable = {0,1}\n"); 238 | exit(EXIT_FAILURE); 239 | } 240 | 241 | speed = atoi(argv[1]); 242 | init_ioperm(); 243 | 244 | if (speed == 9) 245 | return probecodes(); 246 | 247 | if (argc > 2) { 248 | disable = atoi(argv[2]); 249 | if (disable == 1) { 250 | send(DISABLE_BIOS_METHOD1,0); 251 | printf ("BIOS CONTROL DISABLED\n"); 252 | } 253 | else if (disable == 0) { 254 | send(ENABLE_BIOS_METHOD1,0); 255 | printf ("BIOS CONTROL ENABLED\n"); 256 | } 257 | else { 258 | printf ("Use 0 to enable bios control or 1 to disable it\n"); 259 | exit(EXIT_FAILURE); 260 | } 261 | } 262 | 263 | printf ("Setting speed to: %d\n", speed ); 264 | printf ("Speed is now at: %d\n", set_speed(speed)); 265 | 266 | } 267 | -------------------------------------------------------------------------------- /COPYING: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | --------------------------------------------------------------------------------