Date: Tue, 21 Jun 2022 13:51:17 -0700 From: Chris <bsd-lists@bsdforge.com> To: Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> Cc: Emmanuel Vadot <manu@bidouilliste.com>, freebsd-hackers@freebsd.org Subject: Re: Reasons for keeping sc(4) and libvgl ? Message-ID: <5812d9bb3a577fdd76fd58d2dd61a9cd@bsdforge.com> In-Reply-To: <3d09c86a-9840-f8bf-4725-8098d958a01d@plan-b.pwste.edu.pl> References: <20211126160454.3eb827365a02103169ab9adc@bidouilliste.com> <20220621201924.e9b96876c947140ac1f3b7a4@bidouilliste.com> <3d09c86a-9840-f8bf-4725-8098d958a01d@plan-b.pwste.edu.pl>
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--=_2e34baeb8c4f81241cf1013cf6555c5f Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8; format=flowed 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. 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