We have several Rocky 9.x machines in our lab running 24/7 and it happens from time to time that the video output stops working. It then helps to restart the display-manager, but this is a bit sub-optimal solution. Does someone has similar experience and have a solution? I never find something in /var/log/messages that indicates a problem for me, but maybe I just don’t see it or look at the wrong place.
Look for errors with journalctl.
user@rocky: ~$ sudo journalctl --unit=display-manager.service --priority=warning
Once you have found the time the crush occured you can post the messages of all priorities here:
user@rocky: ~$ sudo journalctl --unit=display-manager.service --since="2012-10-30 18:17:16" --until="2012-10-30 18:19:16"
Thanks, on one machine that is currently affected I get
-- No entries --
So not helpful :(, but I think that the problem might be somewhere else and that restarting the display manager just cures the symptom and not the disease. I could imagine that it is some sort of power-saving feature.
Maybe you can find with journcalct any warnings and errors related to your issue, not specifically from the very unit.
Things which might be relevant are
/usr/libexec/gdm-x-session[2841]: (--) NVIDIA(GPU-0): DFP-1: disconnected
/usr/libexec/gdm-x-session[2841]: (--) NVIDIA(GPU-0): DFP-1: Internal DisplayPort
/usr/libexec/gdm-x-session[2841]: (--) NVIDIA(GPU-0): DFP-1: 2670.0 MHz maximum pixel clock
/usr/libexec/gdm-x-session[2841]: (--) NVIDIA(GPU-0):
/usr/libexec/gdm-x-session[2841]: (--) NVIDIA(GPU-0): DFP-3: disconnected
/usr/libexec/gdm-x-session[2841]: (--) NVIDIA(GPU-0): DFP-3: Internal DisplayPort
/usr/libexec/gdm-x-session[2841]: (--) NVIDIA(GPU-0): DFP-3: 2670.0 MHz maximum pixel clock
/usr/libexec/gdm-x-session[2841]: (--) NVIDIA(GPU-0):
/usr/libexec/gdm-x-session[2841]: (--) NVIDIA(GPU-0): DELL U2723QE (DFP-3): connected
/usr/libexec/gdm-x-session[2841]: (--) NVIDIA(GPU-0): DELL U2723QE (DFP-3): Internal DisplayPort
/usr/libexec/gdm-x-session[2841]: (--) NVIDIA(GPU-0): DELL U2723QE (DFP-3): 2670.0 MHz maximum pixel clock
/usr/libexec/gdm-x-session[2841]: (--) NVIDIA(GPU-0):
and/or
systemd-udevd[873]: nvidia: Process '/usr/bin/bash -c '/usr/bin/mknod -Z -m 666 /dev/nvidiactl c $(grep nvidia-frontend /proc/devices | cut -d \ -f 1) 255'' failed with exit code 1.
systemd-udevd[864]: nvidia: Process '/usr/bin/bash -c '/usr/bin/mknod -Z -m 666 /dev/nvidiactl c $(grep nvidia-frontend /proc/devices | cut -d \ -f 1) 255'' failed with exit code 1.
systemd-udevd[873]: nvidia: Process '/usr/bin/bash -c 'for i in $(cat /proc/driver/nvidia/gpus/*/information | grep Minor | cut -d \ -f 4); do /usr/bin/mknod -Z -m 666 /dev/nvidia${>
systemd-udevd[864]: nvidia: Process '/usr/bin/bash -c 'for i in $(cat /proc/driver/nvidia/gpus/*/information | grep Minor | cut -d \ -f 4); do /usr/bin/mknod -Z -m 666 /dev/nvidia${>
kernel: nvidia_uvm: module uses symbols from proprietary module nvidia, inheriting taint.
systemd-udevd[873]: nvidia_modeset: Process '/usr/bin/bash -c '/usr/bin/mknod -Z -m 666 /dev/nvidia-modeset c $(grep nvidia-frontend /proc/devices | cut -d \ -f 1) 254'' failed with>
which appeared before. The last one I don’t really get, but it is related to the nvidia driver and thus potentially the output.
Please may I ask, how do you restart the display-manager?
Thank you kindly.
Dear ashwiz I restart it as
sudo systemctl restart display-manager
Do you have a suggestion for the cause of my problem?
No sorry, I have the same problem.
No problem, I hope that maybe someone else can point me to a more sustainable solution. My I ask if you are using an nvidia card? We assume that it is related to our nvidia cards. Do you use gnome or KDE?
This topic was automatically closed 60 days after the last reply. New replies are no longer allowed.