Date: Tue, 4 Jan 2022 14:32:34 +0100 From: Emmanuel Vadot <manu@bidouilliste.com> To: Stefan Blachmann <sblachmann@gmail.com> Cc: Warner Losh <imp@bsdimp.com>, Joseph Mingrone <jrm@freebsd.org>, =?ISO-8859-1?Q?=D6zkan?= KIRIK <ozkan.kirik@gmail.com>, Michael Schuster <michaelsprivate@gmail.com>, Kyle Evans <kevans@freebsd.org>, Karel Gardas <gardask@gmail.com>, FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: Call for Foundation-supported Project Ideas Message-ID: <20220104143234.d9af3a4aa841c80219cdcf75@bidouilliste.com> In-Reply-To: <CACc-My1WHdgxidCiYDW2RrWxM4sKao7o_Tw-pZuuE_Y0WXC4JQ@mail.gmail.com> References: <861r36xzpe.fsf@phe.ftfl.ca> <61100a28-40ae-4458-d7d5-3bc9b13ba219@gmail.com> <CADqw_gKkii%2BBHk7_jPE0DV5ZdF86ydEq956WDtZOP1N9GBjAPw@mail.gmail.com> <CACNAnaH4GH_n8GVYN44op-VO7VZ5_GLP8SBj0SfoC5KoBSFDQw@mail.gmail.com> <CADqw_gJuU6_Wt-GEJduz_Tm0oQg4dDv-5XDz1bsgWqtCmp1R2w@mail.gmail.com> <CAAcX-AHCom%2B5Zf2ENf%2BcFxPDrCWY=e_EaXfRamd%2BwnynBn1-VQ@mail.gmail.com> <864k6qj6x6.fsf@phe.ftfl.ca> <86zgoihs64.fsf@phe.ftfl.ca> <CACc-My26b1GZ7_s93Jx-DgeA=8%2BdS_2MYSoCv_D6uzRihyNHNQ@mail.gmail.com> <CANCZdfq7s2ODPbrZRztXQ7q1aMeDtK-bsoEoW%2BZKDkiyktKUSQ@mail.gmail.com> <CACc-My1WHdgxidCiYDW2RrWxM4sKao7o_Tw-pZuuE_Y0WXC4JQ@mail.gmail.com>
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On Tue, 4 Jan 2022 08:14:23 +0100 Stefan Blachmann <sblachmann@gmail.com> wrote: > On 1/4/22, Warner Losh <imp@bsdimp.com> wrote: > > Not without loading the xorg graphics stuff... graphics chips from the = last > > 15 or 20 years have lots of chip specific state that only the graphics > > stuff knows about... IIRC, it only knows about it because it put the > > graphics into a known state... it's the main reason laptops stopped > > suspending in the early 2000s... it looks to be a lot of work for a > > relatively rare use case... >=20 > UEFI GOP seems to have the necessary functionalities > (https://wiki.osdev.org/GOP#Get_the_Current_Mode) so I guess the work > required would be limited (restore mode and redraw screen from > buffer). ? You can't get or set the mode after ExitBootService in UEFI, you only have the framebuffer setup by the firmware. > With non-UEFI or old UGA UEFI implementations possibly one could use > the dual BIOS=B4 CSM part. Just call the CSM BIOS init to set up GPU and > the int 10h interface, and then set previously used mode+redraw. > BTW, doing that also could both enable vt(4) to change > modes/resolutions and using sc on UEFI computers. UGA have nothing to do with having CSM. Also I'm unsure if INT 10 would work when booted in UEFI, i.e. I don't think that the firmware will setup the handler in non-CSM mode. > But I think you are right, there are probably not too many users who > would make use of that. >=20 >=20 > On 1/4/22, Warner Losh <imp@bsdimp.com> wrote: > > On Mon, Jan 3, 2022, 11:03 PM Stefan Blachmann <sblachmann@gmail.com> > > wrote: > > > >> Implementing S3 suspend/resume was a sponsored project itself. > >> However, it still does only work when at xorg graphics mode, which > >> already was topic in this thread. > >> When using it from console, no matter sc or vt, it still hangs with > >> dark screen and unresponsive keyboard. > >> Could finishing the suspend/resume work be sponsored, so that it also > >> works on console-only computers? > >> > > > > Not without loading the xorg graphics stuff... graphics chips from the = last > > 15 or 20 years have lots of chip specific state that only the graphics > > stuff knows about... IIRC, it only knows about it because it put the > > graphics into a known state... it's the main reason laptops stopped > > suspending in the early 2000s... it looks to be a lot of work for a > > relatively rare use case... > > > > Warner > > > > > >> On 12/30/21, Joseph Mingrone <jrm@freebsd.org> wrote: > >> > On Thu, 2021-12-30 at 14:15, Joseph Mingrone <jrm@FreeBSD.org> wrote: > >> > > >> >> On Thu, 2021-12-30 at 08:05, =D6zkan KIRIK <ozkan.kirik@gmail.com> > >> >> wrote: > >> >>> I've ideas about enhancing the routing architecture. Is it possible > >> >>> to > >> >>> add to wiki? > >> > > >> >> Certainly. Please do. > >> > > >> > The link again is https://wiki.freebsd.org/2021FoundationCFI > >> > > >> > >> > > >=20 --=20 Emmanuel Vadot <manu@bidouilliste.com> <manu@FreeBSD.org>
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