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Sun, 17 Mar 2019 09:32:45 -0700 (PDT) Received: from [192.168.1.33] ([81.174.250.12]) by smtp.gmail.com with ESMTPSA id b9sm5927899wmc.9.2019.03.17.09.32.44 (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Sun, 17 Mar 2019 09:32:44 -0700 (PDT) Subject: Re: Switching fb backend back to default To: Greg V Cc: FreeBSD Current References: <95dfadc9-8341-b2a5-7b58-e94f46b5fa90@gmail.com> <1552836887.1930.0@unrelenting.technology> From: Johannes Lundberg Openpgp: preference=signencrypt Autocrypt: addr=johalun0@gmail.com; keydata= mQINBFxFmoIBEADoFO5jY+Fmsg44KiZjufEmpEf4kt7nCOfxNG9SruWpoXUaq0B296F+fIZC hNZqv1v7lGTsfoWRusxJmLd5CQgHHxEyruZbbPpNsQ/JKoDY3GGmrmWfN/SX3y0t0kdB9HsW mJcvZhK7we52f4gxddIVBS9nQoVoONX+hzXf8zwOAa0ik0EPgEwpIKS4j9lLq4bU+mqVKdRR bPeDujEA/qbsCKhaFJkPzXZtzEe6srq4RK1doEztwnKz02b+8gs642TRkWDQeTRZputrAaoN Un4R76A1QpXWyrFG1dQu48IGHi3KbkrvNyq6R1aUBIA0+CG1npIbxmc2mtSjoyvdipmDRbBD +mhECIxmYfBT6818zuj91XjrfOyfVdV2BryBvqFkJLkS3N3QElBIiVdDgdrqiNFWiOlDMxNI tdP16oQBNo8IB27/0YHpnQEw1MafZv5gG5DO0zLtLy88ASAfL7BYf90JP19rT4JIwnxsXxyv kEJnzhsXf0QVObEiAu1MqeFyWfZ8PpunmvEmJ0VChOL+v/kIx1E9cxhhzMZhqiMXfyM4zx2+ BF1FwAwJYPuJLu2B3L0uVBu+M1YvSOmKAbXPDP8PsqPjgSBTYI51MUjuuxN6jSsHDuK6G5k4 pUWR8axa+wafhd6Vz8zVwdTJZ9LdxgLLVg0kprBgccPHhPAZVQARAQABtCZKb2hhbm5lcyBM dW5kYmVyZyA8am9oYWx1bjBAZ21haWwuY29tPokCVAQTAQgAPhYhBIl1Pb3+hI60ivmRSULn yG4BGvSeBQJcRZqCAhsjBQkJZgGABQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAAAoJEELnyG4B GvSe9O0P/RzeQAu1R37RlONZTXNn+qIAHvHbZEhzrCibzaZnwYdC31wGrYmXNDyiQIqOngFf QJuufQtH/+95OESJsjR+42L/pNfFdaEWxiI003qE7uCMzLK5UWUXd/5d5vYY0CaPyNCj1tyM ZIq7x4CaR3QLTh/Fw4zMUI/ZPH2S5SxVFGv0ZZFAdNYILD3qCkAS/9HmXsqufBWbfutA8TTf wyJfywmvf7ENjlZ4QOjb242ZY9NndqbmqTgWVAws+PN5e9AT8HkadscCTCSkYnxJyYG2El27 DpAAkekYplb/C0j82KSz2fy9RgwD+tTqt88DJOeFbIbrYt44u7KLHpzaZeqyUtn0reHCkE0W lnKH2kXXbuswFB4sONxI/J5+qSmOsAm5ItO3voyjm/swpmFR1yBlxo4th26gbO5NfBOK9YsY zHKgiRDv6ZdnHo+htphRxcCDHsFPzkQe5jouI25dvMZYl1LaTS/09lwYVwVIB2SFmMtFZ7rB N4NBSzPlpsg+g4dJNqiw6Rfa2Q/wUv+MzTJgLtHjDccXlpm33Nc09UytHFtNn26PO/zrM39r TwzdLu1mg0x2WWEWTIqe4CaczQU9SIg49BSyJNoPSZx3V7nMhTKbOeQKR5aV3dXI66aENw86 pa1tipuUKCPmope/GTJatUgPiD3JkyiD+7c1zQX2UAGmuQINBFxFmoIBEACb55RAkM59huAx 4Ddd8WBjsw25qf7rzxeRKAQ7or/8LvJBYQDPXZy0RhkRiu+P+MjxwGb6HVh+LDyAYDn9d8Mt ZqCP/dOGNcl7pkb6IhfRc3i5neckXCYfbm0cigiX9JkqZSt3KT96zbjCxsFZKyIyEFsMl46q 7wKWK5Irj3zxV/Z51JNTJyMLcIRWhY8G6qlMNFgZkz2Hv63w6BRekKVImOmOdThLAscy5ybq 2CIUeAwPG7lMYG9rgcPdn3tMPeWlLmUmi5pSwOQ3AKg3xFrW3WfegjRHdqpeuXoeTjYPPCW4 gyl59uv6E12a6eivItCxj67vlBXgOr4um+zoPyXG/WfidIFtWaEgyBrlGR1Klk7SIcqjEHUA FdiM+PweY4opHXXKn60NOZCqBJ59K43drOQgRouz8E2T3yEoYg40xAfY3lhJV/Vx5+kSTjmy sT2xotlPn/GzfaAEvNuJDK+Mec3LvfbbDoOWFolNyEvoMQqF5Q3A8eGqYsoVGBPxyzNvF2iY LkymxiXpgrSN0Q/LOK7pFlWwbVC8Z6g5I0J9ecgD55dGLoX2luLir787XX/JxGffzbRnP9NE ifenJGrQmx4CyEaz/CHQqSbROm5Uo/YFUX9J7OfUO4mtu90j773j32I3psey/Fz3EC/A2PHv Ghb0KsWYpS3Pj5TV1gGyswARAQABiQI8BBgBCAAmFiEEiXU9vf6EjrSK+ZFJQufIbgEa9J4F AlxFmoICGwwFCQlmAYAACgkQQufIbgEa9J7qOQ//YG/4e69YTSjtiYLXzBI8tRU2Sx+NFByx zx+C/r0EBThLtgRwCqEUZRB7iIDSO8aZ0Qa3vwWRohlD1tn/LBdDFfMmuQkNVdLIrjBoGBB9 B5xHdZJ9xnTZEwpTtk6IWolT4j+8rpGemGKKiFo3X6l02On4Qb4iM7h6rcDb76mfwooNYzB3 8PPcLvyOWb/9iCXAb5N7doo5zmOl15DVwvIF04eXU0q1FFj/iS1zNmtZ5Got82O1TQFV+de4 Rb3YA80IZhhhCiHHJqkMKeKQogRqU+UNDBARUBxfUtKsJtQzTQ2JUGwkb6X6bx53FTLP6O9q hDoODVweE1LdB1k1H5Nn+gawPdRMBqj43Y2amK7KEgoTBrwU04CLpKiaAC0S+EcJFfJcwtpK k3F+uTtP/hnhFnWbn8SgRkHKXKWqSCt63NstXhMzAJut1gEzV+CcPNKqa/sFgQaYEvzCS5Kl F/PXj0++f3TIFqT+2ZNNp8Bz8dT7gh8RPPg5oYQiCHH8K1RAmq7gKqmwyg0qgOazHnped+od X4f3qx320JAP6NP9wglDm6eht48NJzb0sffN8z34wrP66oz8oPKtS5CFV0m/384hEg0lmi3W wo2Hno7rA1etTPJX0dI6/GLlQDtNTHvKQ077HQdWVOMQVWC9j7YH7Zr9NjtOvxcNVRX3fxpJ 6CE= X-Tagtoolbar-Keys: D20190317163243357 Message-ID: <6ea64218-2b6d-fc9a-01b5-ed07bd23c783@gmail.com> Date: Sun, 17 Mar 2019 16:32:43 +0000 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <1552836887.1930.0@unrelenting.technology> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Language: en-US X-Rspamd-Queue-Id: 632EA869DD X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=VZnKasNA; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of johalun0@gmail.com designates 2a00:1450:4864:20::342 as permitted sender) smtp.mailfrom=johalun0@gmail.com X-Spamd-Result: default: False [-4.67 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; FREEMAIL_FROM(0.00)[gmail.com]; RCVD_COUNT_THREE(0.00)[3]; TO_DN_ALL(0.00)[]; MX_GOOD(-0.01)[cached: alt3.gmail-smtp-in.l.google.com]; DKIM_TRACE(0.00)[gmail.com:+]; RCPT_COUNT_TWO(0.00)[2]; NEURAL_HAM_SHORT(-0.93)[-0.926,0]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_LAST(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; MID_RHS_MATCH_FROM(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-current@freebsd.org]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[2.4.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.5.4.1.0.0.a.2.list.dnswl.org : 127.0.5.0]; IP_SCORE(-0.73)[ip: (0.85), ipnet: 2a00:1450::/32(-2.36), asn: 15169(-2.09), country: US(-0.07)] X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 17 Mar 2019 16:32:49 -0000 On 3/17/19 3:34 PM, Greg V wrote: > > > On Sun, Mar 17, 2019 at 3:07 PM, Johannes Lundberg > wrote: >> Hi >> >> I'm working on making i915kms unload properly. I've come to what I thi= nk >> is the last issue. The drm driver unloads ok, the "efifb" backend is >> restored (according to logs) and vt_efifb_init() is being called but t= he >> screen (laptop built in display) stays black. The system seems >> operational otherwise. If I load i915kms again in this state I get bac= k >> a visible (i915kms) framebuffer. >> >> Did we ever have this working so it's known to work? > > Recently on the linux kernel mailing list: > > http://lkml.iu.edu/hypermail/linux/kernel/1903.1/01162.html > > > Of course, once native drivers like i915 or radeon take over, such a > framebuffer is toast... [6] > > > [6] linux/drivers/gpu/drm/i915/i915_drv.c::i915_kick_out_firmware_fb(= ) > > linux/drivers/gpu/drm/radeon/radeon_drv.c::radeon_pci_probe() > > So it seems like efifb is not supposed to work after a driver has been > loaded at least once. > > Hmm, well the code is there to handle switching back to the boot time fb. What I think is happening is that i915 powers off the displays at unload and vt doesn't know how to power on (or that it should).