On Thu, Mar 26, 2020 at 03:26:05AM +0100, Bengt Richter wrote: > On +2020-03-26 00:00:18 +0100, pelzflorian (Florian Pelz) wrote: > > on one of my computers uvesafb can only be used after „chmmod o+rw > > /dev/fb0“ which is a security issue, I suppose. > > > > Are you a member of the video group?
Indeed the issue was that the gdm user was not a member of the video group. Thank you! I have verified the attached patch makes it sufficient to run `modprobe uvesafb v86d=$(guix build v86d | head -n1)/sbin/v86d mode_option=1280x800-32` before `herd restart xorg-server` without any additional chmod. I will push if nobody objects. I do however need to remove xf86-video-vesa via set-xorg-configuration. Perhaps xf86-video-vesa should not be among the defaults if uvesafb is to be made a default. Note that when not running X as root, xf86-video-vesa does not work anyway. That’s what uvesafb is for. If uvesafb should be made a default, v86d:testvbe could be used to find a suitable resolution as a mode_option parameter. However I still do not know how best to modprobe uvesafb automatically. Regards, Florian
>From 419ec6f3866d223b88f195466d3e731090240a2a Mon Sep 17 00:00:00 2001 From: Florian Pelz <pelzflor...@pelzflorian.de> Date: Thu, 26 Mar 2020 15:19:21 +0100 Subject: [PATCH] services: gdm: Add gdm user to 'video' supplementary group. See <https://lists.gnu.org/archive/html/guix-devel/2020-03/msg00351.html>. * gnu/services/xorg.scm (%gdm-accounts): Set supplementary groups. --- gnu/services/xorg.scm | 1 + 1 file changed, 1 insertion(+) diff --git a/gnu/services/xorg.scm b/gnu/services/xorg.scm index 09379d40c3..d0196a299e 100644 --- a/gnu/services/xorg.scm +++ b/gnu/services/xorg.scm @@ -798,6 +798,7 @@ the GNOME desktop environment.") (user-account (name "gdm") (group "gdm") + (supplementary-groups '("video")) (system? #t) (comment "GNOME Display Manager user") (home-directory "/var/lib/gdm") -- 2.25.1
