Loading Documentation/sound/alsa/Procfile.txt +22 −14 Original line number Original line Diff line number Diff line Loading @@ -88,26 +88,34 @@ card*/pcm*/info substreams, etc. substreams, etc. card*/pcm*/xrun_debug card*/pcm*/xrun_debug This file appears when CONFIG_SND_DEBUG=y. This file appears when CONFIG_SND_DEBUG=y and This shows the status of xrun (= buffer overrun/xrun) debug of CONFIG_PCM_XRUN_DEBUG=y. ALSA PCM middle layer, as an integer from 0 to 2. The value This shows the status of xrun (= buffer overrun/xrun) and can be changed by writing to this file, such as invalid PCM position debug/check of ALSA PCM middle layer. It takes an integer value, can be changed by writing to this # cat 2 > /proc/asound/card0/pcm0p/xrun_debug file, such as When this value is greater than 0, the driver will show the # cat 5 > /proc/asound/card0/pcm0p/xrun_debug messages to kernel log when an xrun is detected. The debug message is shown also when the invalid H/W pointer is detected The value consists of the following bit flags: at the update of periods (usually called from the interrupt bit 0 = Enable XRUN/jiffies debug messages bit 1 = Show stack trace at XRUN / jiffies check bit 2 = Enable additional jiffies check When the bit 0 is set, the driver will show the messages to kernel log when an xrun is detected. The debug message is shown also when the invalid H/W pointer is detected at the update of periods (usually called from the interrupt handler). handler). When this value is greater than 1, the driver will show the When the bit 1 is set, the driver will show the stack trace stack trace additionally. This may help the debugging. additionally. This may help the debugging. Since 2.6.30, this option also enables the hwptr check using Since 2.6.30, this option can enable the hwptr check using jiffies. This detects spontaneous invalid pointer callback jiffies. This detects spontaneous invalid pointer callback values, but can be lead to too much corrections for a (mostly values, but can be lead to too much corrections for a (mostly buggy) hardware that doesn't give smooth pointer updates. buggy) hardware that doesn't give smooth pointer updates. This feature is enabled via the bit 2. card*/pcm*/sub*/info card*/pcm*/sub*/info The general information of this PCM sub-stream. The general information of this PCM sub-stream. Loading Loading
Documentation/sound/alsa/Procfile.txt +22 −14 Original line number Original line Diff line number Diff line Loading @@ -88,26 +88,34 @@ card*/pcm*/info substreams, etc. substreams, etc. card*/pcm*/xrun_debug card*/pcm*/xrun_debug This file appears when CONFIG_SND_DEBUG=y. This file appears when CONFIG_SND_DEBUG=y and This shows the status of xrun (= buffer overrun/xrun) debug of CONFIG_PCM_XRUN_DEBUG=y. ALSA PCM middle layer, as an integer from 0 to 2. The value This shows the status of xrun (= buffer overrun/xrun) and can be changed by writing to this file, such as invalid PCM position debug/check of ALSA PCM middle layer. It takes an integer value, can be changed by writing to this # cat 2 > /proc/asound/card0/pcm0p/xrun_debug file, such as When this value is greater than 0, the driver will show the # cat 5 > /proc/asound/card0/pcm0p/xrun_debug messages to kernel log when an xrun is detected. The debug message is shown also when the invalid H/W pointer is detected The value consists of the following bit flags: at the update of periods (usually called from the interrupt bit 0 = Enable XRUN/jiffies debug messages bit 1 = Show stack trace at XRUN / jiffies check bit 2 = Enable additional jiffies check When the bit 0 is set, the driver will show the messages to kernel log when an xrun is detected. The debug message is shown also when the invalid H/W pointer is detected at the update of periods (usually called from the interrupt handler). handler). When this value is greater than 1, the driver will show the When the bit 1 is set, the driver will show the stack trace stack trace additionally. This may help the debugging. additionally. This may help the debugging. Since 2.6.30, this option also enables the hwptr check using Since 2.6.30, this option can enable the hwptr check using jiffies. This detects spontaneous invalid pointer callback jiffies. This detects spontaneous invalid pointer callback values, but can be lead to too much corrections for a (mostly values, but can be lead to too much corrections for a (mostly buggy) hardware that doesn't give smooth pointer updates. buggy) hardware that doesn't give smooth pointer updates. This feature is enabled via the bit 2. card*/pcm*/sub*/info card*/pcm*/sub*/info The general information of this PCM sub-stream. The general information of this PCM sub-stream. Loading
