Am 01.09.20 um 19:43 schrieb Ben Hutchings: > On Sun, 30 Aug 2020 19:08:00 +0200 Michael Biebl <bi...@debian.org> wrote: >> Control: reassign -1 udev >> Control: tags -1 + moreinfo >> >> Am 30.08.20 um 12:21 schrieb Chris Hofstaedtler: >>> Control: reassign -1 systemd >>> >>> * Michal Suchanek <hramr...@gmail.com>: >>>> So I would like the fbdev modules removed from whatever blacklist prevents >>>> loading them and have them loaded on systems that don't have dri modules to >>>> handle graphics. >>> >>> AFAICT systemd ships the fbdev blacklist nowadays, reassigning >>> there. >> >> The udev package does (but it's src:systemd, so close enough) in >> /lib/modprobe.d/fbdev-blacklist.conf >> >> I don't know the history behind this file though, it predates the >> udev/systemd merge and a quick search in the old src:udev package did >> not really yield anything useful. >> >> Hopefully Marco can chime in here and provide some context why it was >> added and if it's still required thoday. > > The old-style fbdev drivers generally cannot coexist with user-mode > graphics drivers or DRM drivers for the same devices (but the latter > can coexist with each other). The fbdev API provides very little > opportunity for X graphics acceleration, so it's generally preferable > to use X with user-mode graphics drivers (or the newer combined DRM/KMS > drivers). Therefore the fbdev drivers were blocked from auto-loading > by default.
Thanks for this additional information, Ben. > I believe this file used to be a conffile in /etc so that it was > possible to override it in case the user prefers the fbdev driver. You can still do that by creating a file /etc/modprobe.d/fbdev-blacklist.conf which will override the one from /lib. > This does not explain why listing atyfb in a modules list does not > work; the "blacklist" directive should not affect that. Maybe the user did not rebuild his initramfs and the initramfs already loaded the non-fb driver, so loading fbdev failed? Michal, can you still reproduce the problem after running update-initramfs -u ? Michael
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