Hi. I checked this command and I got this:
udevadm info /sys/class/drm/card0 Unknown device "/sys/class/drm/card0": No such device So I tried to find out why this error and I discovered that the nvidia_drm module is not loaded. After loading this module the udevadm got some information: udevadm info /sys/class/drm/card0 P: /devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0 M: card0 R: 0 U: drm T: drm_minor D: c 226:0 N: dri/card0 L: 0 S: dri/by-path/pci-0000:01:00.0-card E: DEVPATH=/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0 E: SUBSYSTEM=drm E: DEVNAME=/dev/dri/card0 E: DEVTYPE=drm_minor E: MAJOR=226 E: MINOR=0 E: USEC_INITIALIZED=4363555 E: ID_PATH=pci-0000:01:00.0 E: ID_PATH_TAG=pci-0000_01_00_0 E: ID_FOR_SEAT=drm-pci-0000_01_00_0 E: DEVLINKS=/dev/dri/by-path/pci-0000:01:00.0-card E: TAGS=:master-of-seat:uaccess:seat: E: CURRENT_TAGS=:master-of-seat:uaccess:seat: But this module was not loaded at boot time and I found an old nvidia.conf at /etc/modprobe.d. Probably it was from an old nvidia package and it prevented this module from loading.. I removed this file and finally nvidia_drm was loaded in the next boot. It worked with lightdm and with sddm. With sddm it stopped working for more than one year until I removed nvidia.conf from modprobe.d. Then, for me, the root cause is a nvidia_drm module not loaded due to a file in modprobe.d . I don't know if there is something similar with the RasperryPi 4. Thanks for the help. Best regards, Adilson Em qui., 5 de out. de 2023 às 06:12, Yves-Alexis Perez <cor...@debian.org> escreveu: > On Thu, Oct 05, 2023 at 01:06:43AM +0200, Michael Biebl wrote: > > have you checked if the graphics device is properly tagged by > > > > /lib/udev/rules.d/71-seat.rules > > > > udevadm info /sys/class/drm/card0 > > → E: TAGS=:seat:master-of-seat:uaccess: > > > Hi Michael, > > thanks for the tip. I'm not the one experiencing the bug, I'm handling > this as LightDM maintainer. So I'm adding back the bug and the two > people who were experiencing it so they can test (especially Adilson). > > Regards, > -- > Yves-Alexis Perez > > -- > To unsubscribe, send mail to 1038611-unsubscr...@bugs.debian.org. > -- Adilson dos Santos Dantas http://www.adilson.net.br http://twitter.com/adilsond
