Comment 21 for bug 974963
Revision history for this message
| Peter Willett (peter-willett) wrote Re: [soundnua]: hdmi audio missing in sound settings | #21 |
© 2004
Canonical Ltd.
•
Terms of use
•
Data privacy
•
Contact Launchpad Support
•
Blog
•
Careers
•
System status
•
73416ba
(Get the code!)
Hi David
I don't know whether this is the right forum to continue with my problem. No doubt someone will tell me if I need to raise it else where. In any event if someone stumbles on this as I did then they may find my comments useful. I think I know what is going on in my case.
When the PC powers up without the TV switched on. There is no handshake between it and the TV over the HDMI cable. The video driver defaults to the expected value but the system disables the video codec. When the TV is switched on, it does not trigger a restart of the video flgrx driver and in turn the audio remains disabled. (Wouln't it be nice if the system detected the TV and this triggers a X server restart.)
I base this on my observations that a HDMI cable unplug and replug triggers a X restart and audio appears. That if I kill the video with "sudo pkill X" in a terminal and relogon the audio appears. If I start the PC after the TV has been switched on the audio appears. The pin 3 results are as you describe above.
Further reading of forum messages on here and elsewhere seems to show that many have overcome this problem by installing the newer video drivers from AMD website. The Ubuntu ones are old and the post release fglrx update in Additional drivers does not work for me and many others from what I can see in the forums. I have not had success installing a newer driver from the AMD site, the process fails for me. I have even tried the latest beta version which apparently has Ubuntu support. I need to pursue this when I have time.
I am sure that if Ctrl-Alt-Backspace was available that would be an easy way to restart the x server and the situation would be acceptable. With Mybuntu I can't enable the feature on the keyboard. I have seen that Alt (Right)- K-PrintScreen restarts the X server but not for me. I am able to add buttons to the mythtv frontend (I have buttons to Power_off and Reboot). I think I will add a button to kill the X server and it will restart. This is fine but the process does not remember that it should autologin but that is better than continually unplugging and replugging in the HDMI cable.
Anyhow, that is as far as I have got.
Peter