[Ubuntu 18.04 LTS] What to do when the screen resolution cannot be selected [NVIDIA]
One day, Ubuntu 18.04 LTS suddenly output only low resolution, so I dealt with it. I think that the work will be completed in about 20 minutes as a whole.
Symptoms
When I started Ubuntu18.04LTS, the screen was strange.
Apparently the resolution is 1024x768.
Even if I try to change it manually, I can't select another resolution. I'm in trouble.
Operating environment
| item | Details |
|---|---|
| OS | Ubuntu 18.04.5 LTS (64bit) |
| RAM | 15.6GiB |
| CPU | Intel Core i5-10400F CPU @ 2.90GHz × 12 |
| GPU | GeForce GTX 1650/PCIe/SSE2 |
| GNOME | 3.28.2 |
| Remarks | External SSD(240GB/USB3.Via 0)Boot from and use |
What I tried
Try reloading EDID (not resolved)
Since "Unknown Display" is displayed, is the EDID not loaded? I thought I tried plugging and unplugging the HDMI cable. This is the quickest way to reload the EDID. But it didn't improve.
Reinstall NVIDIA Driver (solved)
The symptom that is occurring is the same as the symptom that occurred before installing the NVIDIA driver. But you installed the driver ...? I think, I will check various things.
--Check the information of the device connected to VGA
~$ lspci | grep VGA
01:00.0 VGA compatible controller: NVIDIA Corporation Device 1f0a (rev a1)
The NVIDIA Device is recognized. There seems to be no problem.
--Confirmation of resolution information
~$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1024 x 768, current 1024 x 768, maximum 1024 x 768
default connected primary 1024x768+0+0 0mm x 0mm
1024x768 76.00*
Only 1024x768 @ 76Hz resolution is recognized. It's a monitor that supports 1920x1080 @ 60Hz.
--Check NVIDIA settings
~$ nvidia-settings
ERROR: NVIDIA driver is not loaded
ERROR: Unable to load info from any available system
It was . It seems that the driver cannot be read. So let's reinstall NVIDIA's DRIVER.
--Ask for recommended drivers for Ubuntu
~$ ubuntu-drivers devices
== /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0 ==
modalias : pci:v000010DEd00001F0Asv000010DEsd0000145Cbc03sc00i00
vendor : NVIDIA Corporation
driver : nvidia-driver-450-server - distro non-free
driver : nvidia-driver-450 - distro non-free
driver : nvidia-driver-455 - distro non-free recommended
driver : xserver-xorg-video-nouveau - distro free builtin
At `` `ubuntu-drivers devices```, Ubuntu will tell you which drivers to recommend. You are proposing a driver made by NVIDIA properly. Let's introduce it immediately.
--Install Ubuntu recommended driver
~$ sudo ubuntu-drivers autoinstall
This is the only command to introduce. The installation will start automatically, so let's wait for it to finish.
- Reboot
~$ reboot
Let's reboot after the installation is finished. I hope it works.
result
I was able to display at the maximum resolution (1920x1080 @ 60Hz) properly. I did it!
I want a 4K monitor ...
Referenced site
Ubuntu 18.04 Displays Issue -> Unknown Display https://askubuntu.com/questions/1069451/ubuntu-18-04-displays-issue-unknown-display
Install NVIDIA driver on Ubuntu 18.04 https://qiita.com/kannkyo/items/c506437704cd62b31077
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