Resolution options reduced after installing PCI-E RAID card

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#1

Hello,

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.

#2

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
#3

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.

#4

According to https://www.gpuzoo.com/GPU-NVIDIA/GeForce_9100M_G_mGPU_AMD.html the max res are

Video features

So you seem to be above the CGA limit.

#5

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
System:
  Host: ga970 Kernel: 5.13.12-1-default x86_64 bits: 64
  Desktop: KDE Plasma 5.22.4 Distro: openSUSE Tumbleweed 20210827
Machine:
  Type: Desktop Mobo: Gigabyte model: GA-970A-D3 serial: N/A BIOS: Award
  v: F10 date: 05/30/2012
# inxi -Gay
Graphics:
  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*+
#6

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.

#7

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

#8

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.