Resolution options reduced after installing PCI-E RAID card


Well this is a bit of an odd one. I was running my monitor at 2560x1440 over VGA @ 60Hz(which is odd to begin with, the VGA connection shouldn’t have the bandwidth to facilitate this). However, after installing a RAID card because I need a few more SATA connections my maximum available resolution available is now 1024x768 (a fourth of what it used to be!)
I’m using OpenSUSE Tumbleweed 20210720. The motherboard is a Jetway JNC64 with intergrated graphics by NVIDIA (9100M). I’m using the nouveau driver and running KDE and trying to set the resolution through “Display Configuration”.

My question is, how do I get more resolution options showing in display configuration. 1024x768 is very low.

Let’s see why it’s at 1024x768. From Konsole, an Xterm or equivalent GUI terminal. Paste output here from:

inxi -SGay
sudo journalctl -b | grep aile
susepaste /var/log/Xorg.0.log

If you remove the card it goes back to hi-res?

I’d start with xrandr in the command line to see what modes are available. The same?

Also, 2560x1440 @ 60Hz over VGA is surprising. Are you sure of the frequency? A couple of times when I disabled, rebooted and afterwards reconnected my secondary 4K monitor it dropped down to 30 Hz, I had to change it back in KDE settings. The change is noticeable as the mouse gets a bit laggy.

According to the max res are

Video features

So you seem to be above the CGA limit.

Way back when, 2048x1536 was the highest claimed resolution available from analog. 2560x1440 requires about 17% more bits than 2048x1536, so it doesn’t surprise me that it could be possible from analog. 2560x1080 certainly works:

# inxi -SMy
  Host: ga970 Kernel: 5.13.12-1-default x86_64 bits: 64
  Desktop: KDE Plasma 5.22.4 Distro: openSUSE Tumbleweed 20210827
  Type: Desktop Mobo: Gigabyte model: GA-970A-D3 serial: N/A BIOS: Award
  v: F10 date: 05/30/2012
# inxi -Gay
  Device-1: NVIDIA GF108 [GeForce GT 630] vendor: Gigabyte driver: nouveau
  v: kernel bus-ID: 01:00.0 chip-ID: 10de:0f00 class-ID: 0300
  Display: x11 server: X.Org 1.20.13 compositor: kwin_x11 driver:
  loaded: modesetting display-ID: :0 screens: 1
  **Screen**-1: 0 s-res: **2560x2280** s-dpi: 120 s-size: 541x482mm (21.3x19.0")
  s-diag: 725mm (28.5")
  Monitor-1: DVI-I-1 res: 1920x1200 hz: 60 dpi: 94
  size: 519x324mm (20.4x12.8") diag: 612mm (24.1")
  Monitor-2: **VGA**-1 res: **2560x1080** hz: 60 dpi: 97 size: 673x284mm (26.5x11.2")
  diag: 730mm (28.8")
  OpenGL: renderer: llvmpipe (LLVM 12.0.1 128 bits) v: 4.5 Mesa 21.2.0
  compat-v: 3.1 direct render: Yes
# xrandr | egrep 'onnect|creen|\*' | grep -v disconn | sort -r
VGA-1 connected 2560x1080+0+0 (normal left inverted right x axis y axis) 673mm x 284mm
Screen 0: minimum 320 x 200, current 2560 x 2280, maximum 16384 x 16384
DVI-I-1 connected primary 1920x1200+0+1080 (normal left inverted right x axis y axis) 519mm x 324mm
   2560x1080     60.00*+
   1920x1200     59.95*+

Try to reinstall nouveau drivers.
Dual link DVI supports 2560x1600 at 60Hz - if your mobo supports it.
For better performance use video cards supported by open AMD/ATI drivers or closed Nvidia drivers.
VGA gives blurred picture, especially on higher resolutions.

Never heard about monitor which supports 2560x1440 by D-sub input.
Maybe monitor supports 2560x1440 with digital input, but only 2048x1152 with analog input.

Suppose you knew half of all there is to know in the entire universe. Do you suppose something could exist in the half you know nothing about?

I had a bunch of different CRTs with only D-sub inputs that advertised supporting up to 1280x1024 or 1600x1200 that in fact worked for me at 2048x1536. It would not surprise me if a 2K display actually had a VGA input that it is/was supported for 2K resolution.