msi sound drivers

update. After reboot, the computer's sound card problem can be solved perfectly. In addition, if the computer appears QQ message prompts the sound causes the music to become smaller, this only needs to carry on a simple setting can restore. Right-click the sound icon in the lower right corner, pop-up menu select "

, this part by machine itself platform drive and platform equipment (please distinguish with the above platform Drive), platform DriveThe kernel has been completed, so there is no need to care too much about how to alsa with the top of the problem, we only need to register a machine platformEquipment and complete platform and codec coupling.1. ALSA Equipment File StructureControlC0 for sound card control, such as channel selection, mixing, microphone

has 6 devices mounted. According to the actual capacity of the Sound Card, more types of devices can be mounted to the driver, in the include/sound/core. h defines the following device types: # Definesndrc v_dev_toplevel (_ force snd_device_type_t) 0) Generally, we are more concerned with PCM and control devices. 3. Driver Code File structure In the linux2.6 code tree, the structure of the Alsa code

sndrv_dev_jack (_ force snd_device_type_t) 0x1009) # Define sndrv_dev_lowlevel (_ force snd_device_type_t) 0x2000) Generally, we are more concerned with PCM and control devices. 3. Driver Code File structure In the linux2.6 code tree, the structure of the Alsa code file is as follows: Sound/Core/OSS/Seq/Ioctl32/Include/Drivers/I2C/Synth/Emux/PCI/(CARDS)/Isa/(CARDS)/ARM/PPC/ISCSI/USB/PCMCIA/(CAR

Sndrv_dev_jack ((__force snd_device_type_t) 0x1009) #define Sndrv_dev_lowlevel ((__force snd_device_type_t) 0x2000) In general, we are more concerned with both the PCM and control devices.Three. Driver-driven code file structureIn the Linux2.6 code tree, the ALSA code file structure is as follows:Sound/core/oss/seq/ioctl32/include/drivers/i2c/synth/emux/pci/(Cards)/isa/(Cards)/arm/ppc/sparc/usb/pcmcia/(cards)/oss/soc/codecs Core This direc