<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [NVC1] HDMI audio device only visible after rescan" href="https://bugs.freedesktop.org/show_bug.cgi?id=75985#c82">Comment # 82</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [NVC1] HDMI audio device only visible after rescan" href="https://bugs.freedesktop.org/show_bug.cgi?id=75985">bug 75985</a> from <a class="email" href="mailto:lukas@wunner.de" title="Lukas Wunner <lukas@wunner.de>"> Lukas Wunner</a> <pre>(In reply to Przemysław Kopa from <a href="show_bug.cgi?id=75985#c81">comment #81</a>) > (In reply to Daniel Drake from <a href="show_bug.cgi?id=75985#c80">comment #80</a>) > > A patch titled "PCI: Enable NVIDIA HDA controllers" (effecively attachment > > #137939 [details] [review]) is headed into linux-next and potentially Linux > > 5.3. Testing appreciated! > > Hello there! This commit prevents vga_switcheroo from turning off dGPU > (Geforce 540m) on my optimus machine as described here: > <a href="https://bbs.archlinux.org/viewtopic.php?pid=1865512#p1865512">https://bbs.archlinux.org/viewtopic.php?pid=1865512#p1865512</a>. I never had > problems with HDMI audio on this system - I think all connectors are > connected to the Intel GPU, yet NVIDIA HDA is still enabled by this patch. If the HDA is kept runtime resumed, e.g. if it is accessed by a user space application, then the GPU is kept runtime resumed as well. Check the runtime PM status of the HDA: grep . /sys/bus/pci/devices/0000:01:00.1/power/* Check if user space applications have opened the HDA: lsof /dev/snd/controlC1</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>