<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - [965GM SDVO HDMI regression] no video on external monitor without audio" href="https://bugs.freedesktop.org/show_bug.cgi?id=55556#c15">Comment # 15</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - [965GM SDVO HDMI regression] no video on external monitor without audio" href="https://bugs.freedesktop.org/show_bug.cgi?id=55556">bug 55556</a> from <a class="email" href="mailto:tiwai@suse.de" title="Takashi Iwai <tiwai@suse.de>"> Takashi Iwai</a> <pre>Hmm.... It's obviously a change only to HD-audio codec, and I see no link how it affects the video output. Maybe the SVDO HDMI is enabled only when the audio codec's pin is turned on by some reason? The recent HD-audio HDMI driver sets the audio pin only when used. If this is the case, try the following: - get hda-verb program (described in Documentation/sound/alsa/HD-Audio.txt) - build the kernel with CONFIG_SND_HDA_HWDEP=y - check the codec number of HDMI codecs; you can find /proc/asound/card*/codec#* files, and one of them must contain "HDMI" codec name. The number after '#' is the codec address. - Check "Pin" widget nodes. The codec#* proc file contains the list of widgets, and some of them must be pin widgets, e.g. 0x03. - Run the command to each pin widget like below: hda-verb /dev/snd/hwC0D3 0x03 SET_PIN_WID 0x40 where /dev/snd/hwC0D3 is the hwdep device corresponding to card0/codec#3. The second argument (0x03) is the pin widget NID to apply.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>