On 4/8/22 05:02, Hans de Goede wrote: > Hi, > > On 4/8/22 07:01, Kevin Kofler via devel wrote: >> Ben Cotton wrote: >>> == Owner == >>> * Name: [[User:ajax|Adam Jackson]] >>> * Email: a...@redhat.com >>> >>> == Detailed Description == >>> >>> Fedora's primary desktop environments are moving away from being X11 >>> sessions, to being Wayland servers in their own right. This transition >>> is incomplete, and the Xorg server is still potentially used in a >>> variety of "fallback" situations. In particular the `vesa` and `fbdev` >>> drivers can find themselves pressed into use when accelerated graphics >>> is unavailable. Both of these drivers are somewhat deprecated >>> upstream, and the code to reach them is increasingly fragile as it >>> gets exercised less and less. >>> >>> This change will identify the remaining configurations that can reach >>> these drivers, establish an alternative for display support for each >>> configuration, and then remove the drivers and their support code in >>> xserver. >> >> Removing the fallback drivers that (almost) always work strikes me as an >> extraordinarily bad idea. It will knowingly desupport any graphics hardware >> not covered by the main drivers and it may turn out to unknowingly desupport >> even more hardware, where the hardware-specific drivers that should work >> actually do not. It also means that there will be no workaround at all if >> the native driver is temporarily broken on the given hardware for whatever >> reason. Hence, I am strongly opposed to this change. > > Note that for Fedora 36 we have already dropped efifb and replaced it > with simpledrm: > > https://fedoraproject.org/wiki/Changes/ReplaceFbdevDrivers > > So this means that in our default configs we no longer have any > fbdev drivers active.
Dropping fbdev is fine if there is nothing using it. > And simpledrm can also be used with the kernels builtin vesa support > on legacy BIOS systems, so in essence starting with F36 we will always > have a drm/kms node available for the Xorg modesetting to bind to. That’s okay so long as the modes can be switched at runtime. > With the above Fedora *36* change in place the fbdev/vesa drivers > will be practically completely unused, so I don't really expect > any problems from this change. > > As for odd hw out there, a lot of work has been the last couple > of years to make sure that we have drm/kms drivers for almost all > hw out there, esp. also focusing on weird server hw VGA cards. > > So most hw will either be new enough to offer an efifb which > simpledrm will turn into a drm/kms /dev/dri/card0 device. Or it > will be old enough that it almost certainly will have > a drm/kms driver. > > And for the really odd duck out a vesa mode can be set on the kernel > cmdline which simpledrm should then pick up: If this could be made runtime configurable I would be fine with this change. -- Sincerely, Demi Marie Obenour (she/her/hers) _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
