In the last couple of days my two monitor setup stopped working, where the second monitor switches off, does not render. Now i am just seeing a black screen with a cursor.
I have tried downgrading, reinstalling the driver and also explicitly disabling nouveau but nothing makes a difference. I also removed the latest OEM kernel 6.0
Please blacklist nvidiafb, that’s no part of the nvidia driver and is blocking it.
Looking at your bug report log in the other thread about your monitor issues, this looks like a cable/monitor issue. The stable monitor runs at 165MHz, the unstable at 300MHz. It sometimes vanishes completely, sometimes it’s there but the edid can’t be read. Please swap cables between the monitors and check whether the issue moves with it.
Furthermore, you seem to have some desktop plugin running that’s hammering the xserver with xrandr queries every second. Rather find and disable it.
There are no nvidia kernel modules installed. Please try reinstalling kernel headers
sudo apt install --reinstall linux-headers-$(uname -r)
and post the output of
dkms status
dpkg -l |grep nvidia
The UX window manager/monitors are still not loading. I get a cursor with a black screen and to access the shell i am still CTRL + ALT + F3 and login there.
Thank you. I am able to boot with the 60-generic kernel. I swapped monitors around and now they both work. For some reason they stopped working when connected with the other cables?
How do i identify really what is causing this?
Also you wrote earlier
“you seem to have some desktop plugin running that’s hammering the xserver with xrandr queries every second.”
Can you please point out where you spotted this from so i can further look into it?
I can only speculate. While the monitors are the same, they might have different firmware versions, thus using different connection speeds. One cable might be flakey so only works at the lower speed monitor. Another idea might be the connectors became dirty and just pulling out/plugging back in the cables made it work again.
Hi generix, not sure if it’s proper way to ask help, been quite frustrated with my Ubuntu 22.04, I read a lot your threads here, but seems still I couldn’t fix my issue.
thanks for your time.
Env
Ubuntu 22.04
Secure boot disabled
Quadro T2000 with Max-Q Design/PCIe/SSE2 / Quadro T2000 with Ma…
LG using HDMI, DELL using DP, via dock station connected to laptop( confirmed same cable connection working for my another Win laptop, I can use 2 external monitors)
Issue Desc
Black screen issue when connect all my two external monior (it can detect all 3 monitors 1 laoptop, 2 external;)
Remove DELL(DP cable) from docker station, LG works(HDMI)
Tried tweaking refresh rate and resolution, not seems work.
Extra Info
sudo apt install linux-headers-$(uname -r)
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
sudo ubuntu-drivers autoinstall
All the available drivers are already installed.
(--) NVIDIA(0): DFP-0.2
(--) NVIDIA(0): DFP-0.3.1
[...]
(WW) NVIDIA(0): No valid modes for
(WW) NVIDIA(0): "DFP-0.2:nvidia-auto-select,DFP-0.3.1:nvidia-auto-select";
(WW) NVIDIA(0): removing.
The dock has a slightly odd topology, the DP connector to the dell looks like daisy-chained to another connector. The nvidia driver has a bug with that. What dock model is this, does it have a third monitor connector?
Please try using the latest 550 driver, if that doesn’t help, please set mode debugging by creating
/etc/X11/xorg.conf.d/nv-modebug.conf
