On Thu, Aug 15, 2019 at 10:30 AM <mario.limoncie...@dell.com> wrote: > > > On Thu, Aug 15, 2019 at 10:15 AM Karol Herbst <kher...@redhat.com> wrote: > > > > > > On Thu, Aug 15, 2019 at 4:13 PM Alex Deucher <alexdeuc...@gmail.com> > > wrote: > > > > > > > > On Thu, Aug 15, 2019 at 10:04 AM Karol Herbst <kher...@redhat.com> > > > > wrote: > > > > > > > > > > On Thu, Aug 15, 2019 at 3:56 PM <mario.limoncie...@dell.com> wrote: > > > > > > > > > > > > > -----Original Message----- > > > > > > > From: linux-acpi-ow...@vger.kernel.org <linux-acpi- > > ow...@vger.kernel.org> On > > > > > > > Behalf Of Dave Airlie > > > > > > > Sent: Wednesday, August 14, 2019 5:48 PM > > > > > > > To: Karol Herbst > > > > > > > Cc: LKML; Linux ACPI; dri-devel; nouveau; Rafael J . Wysocki; > > > > > > > Alex Hung; > > Ben > > > > > > > Skeggs; Dave Airlie > > > > > > > Subject: Re: [Nouveau] [PATCH 1/7] Revert "ACPI / OSI: Add OEM > > > > > > > _OSI > > string to > > > > > > > enable dGPU direct output" > > > > > > > > > > > > > > On Thu, 15 Aug 2019 at 07:31, Karol Herbst <kher...@redhat.com> > > wrote: > > > > > > > > > > > > > > > > This reverts commit 28586a51eea666d5531bcaef2f68e4abbd87242c. > > > > > > > > > > > > > > > > The original commit message didn't even make sense. AMD _does_ > > support it and > > > > > > > > it works with Nouveau as well. > > > > > > > > > > > > > > > > Also what was the issue being solved here? No references to any > > > > > > > > bugs > > and not > > > > > > > > even explaining any issue at all isn't the way we do things. > > > > > > > > > > > > > > > > And even if it means a muxed design, then the fix is to make it > > > > > > > > work > > inside the > > > > > > > > driver, not adding some hacky workaround through ACPI tricks. > > > > > > > > > > > > > > > > And what out of tree drivers do or do not support we don't care > > > > > > > > one > > bit anyway. > > > > > > > > > > > > > > > > > > > > > > I think the reverts should be merged via Rafael's tree as the > > > > > > > original > > > > > > > patches went in via there, and we should get them in asap. > > > > > > > > > > > > > > Acked-by: Dave Airlie <airl...@redhat.com> > > > > > > > Dave. > > > > > > > > > > > > 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? > > > > > > > > Hybrid Graphics is the new "standard" way of handling these laptops. > > > > It uses the standard _PR3 APCI method to handle dGPU power. Support > > > > for this was added to Linux relatively later compared to when the > > > > laptops were launched. "Power Express" used the other AMD specific > > > > ATPX ACPI method to handle dGPU power. The driver supports both so > > > > either method will work. > > > > > > > > Alex > > > > > > > > > > thanks for clarifying. But that still means that we won't need such > > > workarounds for AMD users, right? amdgpu handles hybrid graphics just > > > fine, right? > > > > Yeah it should, assuming you have a new enough kernel which supports > > HG, which has been several years at this point IIRC. > > > > Alex > > > > Can you define how new of a kernel is a new enough kernel? > > Looking on my side these problems were on new hardware (Precision 7740) and > are checked as recently as start of this summer, w/ kernel 4.15.
I don't remember off hand. It was before the _PR3 support in the pci subsystem was upstream. What was the problem you were seeing with this system? Alex > > We can arrange to have it checked again on 5.3rcX w/ the OSI disabled. _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
