On Sat, Feb 20, 2016 at 09:12:42AM -0600, Pierre-Louis Bossart wrote:
On 02/19/2016 02:39 PM, Giacomo Comes wrote:
Hi, I have recently bought a Intel Compute Stick and I am having trouble with the audio. Intel provides a custom Ubuntu release that support audio, but I want to run the linux distribution of my choice on it (openSUSE 13.2 for the moment).
In order to have HDMI audio support it is necessary to compile a kernel with this patch (https://raw.githubusercontent.com/01org/baytrailaudio/master/hdmi_audio_2015...) provided by Intel for kernel 3.16.7 (https://01.org/ubuntu-hdmi)
I compiled the openSUSE kernel using the default openSUSE .config plus the following: CONFIG_SUPPORT_HDMI=y CONFIG_SND_SOC=m CONFIG_SND_SOC_INTEL_SST=m CONFIG_SND_SOC_INTEL_BYT_RT5640_MACH=m
I booted the new kernel and aplay -l gives this output: **** List of PLAYBACK Hardware Devices **** card 0: IntelHDMI [IntelHDMI], device 0: IntelHDMI [IntelHDMI] Subdevices: 0/1 Subdevice #0: subdevice #0
but when I run: aplay /usr/share/sounds/alsa/test.wav the audio plays for .2 seconds and then nothing more. Sometime it will play later a little bit more and stop again. At some point these messages appears: underrun!!! (at least 29325.946 ms long) underrun!!! (at least 1535.889 ms long) underrun!!! (at least 3196.213 ms long)
I have looked around on google for a hint on how to fix this issue but I found nothing. Any idea where to look for a solution?
Attached there are the dmesg and lsmod output for ubuntu with the working audio and openSUSE 13.2 plus patch without the working audio. I can provide any other information you need.
Thank you for answering. I'm glad that at Intel you are trying to make this work properly. I think a proper linux support for your device can only increase his sales. I myself intend to buy at least 5 more for personal use, and, being a system administrator, I have plan to deploy about 20 Compute Stick in my work place. But before that happens, a better linux support is advisable.
There are enough messages that make me believe something is very wrong from the start
19.664486] had: ******** HAD DRIVER loading.. Ver: 0.01.003 [ 19.664549] hdmi_audio_probe dma_mask: 0 [ 19.664937] card->dev is NULL!!!!! Should not be this case [ 19.668176] [drm] mid_hdmi_audio_register: Scheduling HDMI audio work queue [ 19.670745] [drm:i915_had_wq] *ERROR* Checking for HDMI connection at boot
Some of us at Intel are trying to clean this up but it'll take time.
I think the issue I'm having is not with the driver itself. I have followed another path. Instead of patching and recompiling the kernel, I have used this source: http://oem.archive.canonical.com/updates/pool/public/o/oem-audio-i915-baytra... and installed the hdmi_audio module using dkms. After reboot the message: card->dev is NULL!!!!! Should not be this case is missing (see attached dmesg output) but still when I try to play a sound aplay hangs as before. Can anybody tell me were to look for the problem I'm having? I suspect a configuration/initialization problem. The same module works with the ubuntu image for the Compute Stick.
Giacomo