Date: Fri, 24 Jun 2022 08:04:05 -0700 From: Chris <bsd-lists@bsdforge.com> To: Emmanuel Vadot <manu@bidouilliste.com> Cc: freebsd-hackers@freebsd.org, Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> Subject: Re: Reasons for keeping sc(4) and libvgl ? Message-ID: <7625cebc70853cb9bb950c704e675df0@bsdforge.com> In-Reply-To: <20220622044714.c1cf644ae8f34d6ea4b863cb@bidouilliste.com> References: <20211126160454.3eb827365a02103169ab9adc@bidouilliste.com> <20220621201924.e9b96876c947140ac1f3b7a4@bidouilliste.com> <3d09c86a-9840-f8bf-4725-8098d958a01d@plan-b.pwste.edu.pl> <5812d9bb3a577fdd76fd58d2dd61a9cd@bsdforge.com> <20220622044714.c1cf644ae8f34d6ea4b863cb@bidouilliste.com>
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--=_f47d59e793a49f8a3b28d058fdfae6fb Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8; format=flowed On 2022-06-21 19:47, Emmanuel Vadot wrote: > On Tue, 21 Jun 2022 13:51:17 -0700 > Chris <bsd-lists@bsdforge.com> wrote: > >> On 2022-06-21 11:36, Marek Zarychta wrote: >> > W dniu 21.06.2022 o 20:19, Emmanuel Vadot pisze: >> >> Hello, >> >> >> >> On Fri, 26 Nov 2021 16:04:54 +0100 >> >> Emmanuel Vadot <manu@bidouilliste.com> wrote: >> >> >> >>> Hello all, >> >>> >> >>> I'm currently re-implementing the framebuffer code in linuxkpi for >> >>> drm-kmod and this made me look at sc(4), vt(4) and friends. >> >>> >> >>> So I looked at what sc could do and vt couldn't and vice-versa. >> >>> >> >>> What sc(4) can't do : >> >>> >> >>> - Work with EFI firmware. >> >>> - Support UTF-8 >> >>> - Maybe other things but everything here is EFI-based so let me know. >> >>> >> >>> What vt(4) can't do : >> >>> >> >>> - You can't get the modes or adapter info with vidcontrol. >> >>> vidcontrol -i mode is really made for anything vesa based as it >> >>> iterates on all the modes and display them if present. >> >>> In the modern world (EFI), we don't have that, EFI GOP doesn't >> >>> support changing resolution after ExitBootService was called so there >> >>> is only one "mode". I could possibly hack some patch so vidcontrol -i >> >>> mode/adapter would work and display the current framebuffer info if >> >>> people wants (but I honestly doubt that vidcontrol is useful at all in >> >>> an EFI world). >> >>> - "Blanking" screen doesn't do what you think it does. For some reason >> >>> in vt(4) we just write black colors on the screen and ignore the blank >> >>> mode passed in the ioctl. >> >>> Now again, blanking/dpms/blah isn't possible with efi_fb but it make >> >>> sense to fix vt(4) and drm-kmod so it calls the drm module blanking >> >>> function, I'll work on that next week. >> >>> - There is no screensaver, again see notes above for dpms but do >> >>> people still use sc(4) just for the screensaver ?? >> >>> - Maybe other things, please let me know. >> >>> >> >>> For libvgl it probably made sense back in the 90s but does it now ?? >> >>> >> >>> Based on my small list I don't see any good reason to keep sc(4) but >> >>> maybe I've missed something bigger so please let me know. >> >>> >> >>> P.S.: I'm really not interested by people saying stuff like >> >>> "I've always used sc(4), it works for me don't touch it" >> >>> without some technical argument. >> >>> >> >>> Cheers, >> >>> >> >>> -- Emmanuel Vadot <manu@bidouilliste.com> <manu@freebsd.org> >> >>> >> >> I've put up in phab removing sc(4) from GENERIC and MINIMAL : >> >> >> >> https://reviews.freebsd.org/D35538 >> >> https://reviews.freebsd.org/D35539 >> >> >> >> If you have any good reason that sc(4) should be included in those >> >> kernel config for amd64 (no other arches was touched) please provide >> >> some argument on the reviews. >> >> >> >> Cheers, >> >> >> > Thanks for heads up. Unfortunately, it will be a great loss. The waste of >> > power >> > resources might increase since vt(4) still doesn't support VESA Display >> > Power >> > Management Signaling which some of the servers are heavily relying on. It's >> > a step >> > backward in terms of green computing and amidst the power crisis, we are >> > heading >> > in Europe. >> My only objection is that I can NOT get textmode or very stable X on any of >> the NVIDIA >> cards I use unless I build against sc. Does sc(4) use so much space that >> current kernels >> become too big with it's presence? I vote against it's removal. >> >> Chris > > I'm sure that other people uses nvidia cards with vt(4), I'm *know* they do. I've assisted others by responding to threads on the mailing lists, pr(1)'s && the FreeBSD forums, in fact I've also talked with Toomas on the OpenIndiana mailing lists regarding this on OI. Not a huge deal. But another obstacle/hurdle in order to obtain reasonable graphics. > did you opened a PR about this ? See above. Thanks for taking the time to respond. 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