On Thu, 13 Sep 2018 15:27:16 +0200, Jian-Hong Pan wrote: > > 2018-09-13 14:56 GMT+08:00 Takashi Iwai <tiwai@xxxxxxx>: > > The recent change of vga_switcheroo allowed the runtime PM for > > HD-audio on AMD GPUs, but this also resulted in a regression. When > > the HD-audio controller driver gets runtime-suspended, HD-audio link > > is turned off, and the hotplug notification is ignored. This leads to > > the inconsistent audio state (the connection isn't notified and ELD is > > ignored). > > > > The best fix would be to implement the proper ELD notification via the > > audio component, but it's still not ready. As a quick workaround, > > this patch adds the check of runtime_idle and allows the runtime > > suspend only when the vga_switcheroo is bound with discrete GPU. > > That is, a system with a single GPU and APU would be again without > > runtime PM to keep the HD-audio link for the hotplug notification and > > ELD read out. > > > > Also, the codec->auto_runtime_pm flag is set only for the discrete GPU > > at the time GPU gets bound via vga_switcheroo (i.e. only dGPU is > > forcibly runtime-PM enabled), so that APU can still get the ELD > > notification. > > > > For identifying which GPU is bound, a new vga_switcheroo client > > callback, gpu_bound, is implemented. The vga_switcheroo simply calls > > this when GPU is bound, and tells whether it's dGPU or APU. > > Tested-by: Jian-Hong Pan <jian-hong@xxxxxxxxxxxx> Thanks. I should put you also as the original reporter. Lukas, could you check the vga_switcheroo change whether it's acceptable? Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
