Here is my problem, which I can't solve.
I bought a new 27" display (Samsung) with a native resolution of 2560 x 1440p for a frequency of 144 Hz. The screen works perfectly as a dual screen on my Ubuntu 20.04 laptop (Intel integrated chipset) and on a DELL Win10 laptop.
Problem, I bought it for my tower which is equipped with a Nvidia GT 610 Fanless graphics card. I suspect this graphics card because neither the screen nor the HDMI cable are involved (cable sold with the screen).
If I boot on my USB key, I end up with a 120Hz frequency that overwrites the text in height, if I switch back to 60Hz and 1920x1080 resolution, I find a nearly normal display. It's the same problem if I boot on my Ubuntu 20.04 (Gnome), neither with the Nvidia 390 driver nor with Nouveau, I have no access to the native resolution of the screen, I'm only in Full-Hd (60Hz).
I made some tests here :
bristow@Desktop:~$ xrandr --newmode $(gtf 2560 1440 144 | sed -ne 's/"//g;s/ Modeline //p')
bristow@Desktop:~$ xrandr --addmode HDMI-0 2560x1440_144.00
X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 18 (RRAddOutputMode)
Serial number of failed request: 29
Current serial number in output stream: 30
I have this error and therefore cannot activate the resolution. If an expert could get through?
If it's my graphics card, what can I buy to make sure I have the right resolution with 144Hz frequency (fanless on the other hand)?
Thanks!
Finally, it was my video card.
I bought a Nvidia GT1030 with HDMI et DP ports and i have good resolution and refresh rate \o/