From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0863DC3A59C for ; Thu, 15 Aug 2019 14:56:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DCA0920656 for ; Thu, 15 Aug 2019 14:56:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731551AbfHOO4o (ORCPT ); Thu, 15 Aug 2019 10:56:44 -0400 Received: from mx2.suse.de ([195.135.220.15]:60700 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728500AbfHOO4n (ORCPT ); Thu, 15 Aug 2019 10:56:43 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 5F2F0AD5D; Thu, 15 Aug 2019 14:56:42 +0000 (UTC) Date: Thu, 15 Aug 2019 16:56:41 +0200 Message-ID: From: Takashi Iwai To: Alex Deucher Cc: Karol Herbst , Mario.Limonciello@dell.com, nouveau , "Rafael J . Wysocki" , LKML , dri-devel , Linux ACPI Mailing List , Alex Hung , Ben Skeggs , David Airlie Subject: Re: [Nouveau] [PATCH 1/7] Revert "ACPI / OSI: Add OEM _OSI string to enable dGPU direct output" In-Reply-To: References: <20190814213118.28473-1-kherbst@redhat.com> <20190814213118.28473-2-kherbst@redhat.com> <5e05532328324d01bc554c573f6298f8@AUSX13MPC101.AMER.DELL.COM> <3fc22fe8bcaf4304bb07534b61c4de90@AUSX13MPC101.AMER.DELL.COM> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 Emacs/25.3 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 15 Aug 2019 16:37:05 +0200, Alex Deucher wrote: > > On Thu, Aug 15, 2019 at 10:25 AM Karol Herbst wrote: > > > > On Thu, Aug 15, 2019 at 4:20 PM wrote: > > > > > > > > There are definitely going to be regressions on machines in the field with the > > > > > in tree drivers by reverting this. I think we should have an answer for all of > > > > those > > > > > before this revert is accepted. > > > > > > > > > > Regarding systems with Intel+NVIDIA, we'll have to work with partners to > > > > collect > > > > > some information on the impact of reverting this. > > > > > > > > > > When this is used on a system with Intel+AMD the ASL configures AMD GPU to > > > > use > > > > > "Hybrid Graphics" when on Windows and "Power Express" and "Switchable > > > > Graphics" > > > > > when on Linux. > > > > > > > > and what's exactly the difference between those? And what's the actual > > > > issue here? > > > > > > DP/HDMI is not detected unless plugged in at bootup. It's due to missing HPD > > > events. > > > > > > > afaik Lyude was working on fixing all that, at least for some drivers. > > If there is something wrong, we still should fix the drivers, not > > adding ACPI workarounds. > > > > Alex: do you know if there are remaining issues regarding that with amdgpu? > > There was an issue with hpd events not making it to the audio side > when things were powered down that was fixed with this patch set: > https://patchwork.freedesktop.org/patch/316793/ > Those patches depended on a bunch of alsa changes as well which may > have not been available in the distro used for a particular OEM > program. FYI, the corresponding commit for ALSA part is destined for 5.4 kernel: https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git/commit/?id=ade49db337a9d44ac5835cfce1ee873549011b27 BTW, Nouveau should suffer from the same problem. The patch to add the audio component support is found at: https://patchwork.freedesktop.org/patch/319131/ thanks, Takashi