Date: Fri, 26 Apr 2019 19:39:08 -0400 From: Tycho Nightingale <tychon@freebsd.org> To: Andrey Fesenko <f0andrey@gmail.com> Cc: Johannes Lundberg <johalun0@gmail.com>, Jakob Alvermark <jakob@alvermark.net>, x11@freebsd.org Subject: Re: drm-current-kmod-4.16.g20190424 hangs Message-ID: <28D240F3-1772-42C1-8F39-54002E53F53B@freebsd.org> In-Reply-To: <CA%2BK5SrMbgv6pJb7iwmZKWx=Sb7mzx1uYxg6kJYxZ2626TYgvxg@mail.gmail.com> References: <5713985b-e97f-c7f2-2592-47a17baf8095@alvermark.net> <f8da5a4b-98c9-417f-dd8b-6bd4b4713d25@gmail.com> <88157456-fe57-997a-14f6-9d1b01c2dbc9@alvermark.net> <63377546-e82f-3d95-0a4b-0d0d8602d9e4@gmail.com> <CA%2BK5SrMbgv6pJb7iwmZKWx=Sb7mzx1uYxg6kJYxZ2626TYgvxg@mail.gmail.com>
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Hi, > On Apr 26, 2019, at 4:39 PM, Andrey Fesenko <f0andrey@gmail.com> = wrote: >=20 > On Fri, Apr 26, 2019 at 6:23 PM Johannes Lundberg <johalun0@gmail.com> = wrote: >>=20 >> =46rom https://reviews.freebsd.org/D19845 Can you try the sysctls >> suggested there? >>=20 >=20 > hw.busdma.default=3D"bounce" and hw.dmar.enable=3D"0" ? both not exist >=20 > attach debug dmesg > <dmesg.boot> What are your BIOS settings for VT-d? I see an ACPI DMAR table being = reported. As kib@ noted in https://reviews.freebsd.org/D19845: it=E2=80=99= s not to be a surprise that "Intel GPU does not work with the DMAR = enabled=E2=80=9D. As a first step please make sure that VT-d is disabled. Then proceed to = enabling it in identity mapped mode and finally in re-mapped mode. That = should give some additional insight into the culprit e.g. the device not = being IOMMU compatible or the driver not being IOMMU compatible or = something else entirely. Tycho=
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