~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/Documentation/sound/designs/powersave.rst

Version: ~ [ linux-6.12-rc7 ] ~ [ linux-6.11.7 ] ~ [ linux-6.10.14 ] ~ [ linux-6.9.12 ] ~ [ linux-6.8.12 ] ~ [ linux-6.7.12 ] ~ [ linux-6.6.60 ] ~ [ linux-6.5.13 ] ~ [ linux-6.4.16 ] ~ [ linux-6.3.13 ] ~ [ linux-6.2.16 ] ~ [ linux-6.1.116 ] ~ [ linux-6.0.19 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.171 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.229 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.285 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.323 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.336 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.337 ] ~ [ linux-4.4.302 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.12 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

Diff markup

Differences between /Documentation/sound/designs/powersave.rst (Version linux-6.12-rc7) and /Documentation/sound/designs/powersave.rst (Version linux-2.4.37.11)


  1 ==========================                        
  2 Notes on Power-Saving Mode                        
  3 ==========================                        
  4                                                   
  5 AC97 and HD-audio drivers have the automatic p    
  6 This feature is enabled via Kconfig ``CONFIG_S    
  7 and ``CONFIG_SND_HDA_POWER_SAVE`` options, res    
  8                                                   
  9 With the automatic power-saving, the driver tu    
 10 appropriately when no operation is required.      
 11 the device and/or no analog loopback is set, t    
 12 done fully or partially.  It'll save a certain    
 13 good for laptops (even for desktops).             
 14                                                   
 15 The time-out for automatic power-off can be sp    
 16 module option of snd-ac97-codec and snd-hda-in    
 17 the time-out value in seconds.  0 means to dis    
 18 power-saving.  The default value of timeout is    
 19 ``CONFIG_SND_AC97_POWER_SAVE_DEFAULT`` and        
 20 ``CONFIG_SND_HDA_POWER_SAVE_DEFAULT`` Kconfig     
 21 (the minimum value) isn't recommended because     
 22 reopen the device frequently.  10 would be a g    
 23 operations.                                       
 24                                                   
 25 The ``power_save`` option is exported as writa    
 26 adjust the value via sysfs on the fly.  For ex    
 27 automatic power-save mode with 10 seconds, wri    
 28 ``/sys/modules/snd_ac97_codec/parameters/power    
 29 ::                                                
 30                                                   
 31         # echo 10 > /sys/modules/snd_ac97_code    
 32                                                   
 33                                                   
 34 Note that you might hear click noise/pop when     
 35 state.  Also, it often takes certain time to w    
 36 power-down to the active state.  These are oft    
 37 don't report extra bug reports unless you have    
 38                                                   
 39 For HD-audio interface, there is another modul    
 40 power_save_controller.  This enables/disables     
 41 the controller side.  Setting this on may redu    
 42 consumption, but might result in longer wake-u    
 43 Try to turn it off when you experience such a     
                                                      

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

sflogo.php