2k with 240hz not available

General system Kernel, boot, graphics & hardware
1

Hello,

I have two iiyama G8279OQSU (27") connected to GTX 1060 using display ports and i’m not able to set them on 240hz refresh rate with 2k resolution.

It’s working fine on same pc on Windows - it’s not problem with cable or gpu.
I’m using X11 with Gnome. Here is what xrand is saying:

Screen 0: minimum 8 x 8, current 5120 x 1440, maximum 32767 x 32767
DVI-D-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-0 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
   2560x1440     59.95 + 143.86*  119.88  
   2048x1280     59.96  
   1920x1200     59.88  
   1920x1080    239.76   119.88    60.00    59.94    50.00  
   1680x1050     59.95  
   1600x1200     60.00  
   1600x1000     59.87  
   1600x900      60.00  
   1440x900      59.89  
   1280x1024     75.02  
   1280x720      59.94    50.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       59.94  
   640x480       75.00    59.94    59.93  
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 connected primary 2560x1440+2560+0 (normal left inverted right x axis y axis) 597mm x 336mm
   2560x1440     59.95 + 143.86*  119.88  
   2048x1280     59.96  
   1920x1200     59.88  
   1920x1080    239.76   119.88    60.00    59.94    50.00  
   1680x1050     59.95  
   1600x1200     60.00  
   1600x1000     59.87  
   1600x900      60.00  
   1440x900      59.89  
   1280x1024     75.02  
   1280x720      59.94    50.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       59.94  
   640x480       75.00    59.94    59.93  
DP-3 disconnected (normal left inverted right x axis y axis)

And here is inxi

Graphics:
  Device-1: NVIDIA GP106 [GeForce GTX 1060 6GB] vendor: ASUSTeK driver: nvidia
    v: 535.104.05 alternate: nouveau,nvidia_drm non-free: 535.xx+
    status: current (as of 2023-08) arch: Pascal code: GP10x
    process: TSMC 16nm built: 2016-21 pcie: gen: 3 speed: 8 GT/s lanes: 16
    bus-ID: 01:00.0 chip-ID: 10de:1c03 class-ID: 0300
  Display: x11 server: X.Org v: 21.1.8 with: Xwayland v: 23.2.0
    compositor: gnome-shell v: 44.4 driver: X: loaded: nvidia gpu: nvidia
    display-ID: :0 screens: 1
  Screen-1: 0 s-res: 5120x1440 s-dpi: 96 s-size: 1355x381mm (53.35x15.00")
    s-diag: 1408mm (55.42")
  Monitor-1: DP-0 pos: left res: 2560x1440 dpi: 109
    size: 597x336mm (23.5x13.23") diag: 685mm (26.97") modes: N/A
  Monitor-2: DP-2 pos: primary,right res: 2560x1440 dpi: 109
    size: 597x336mm (23.5x13.23") diag: 685mm (26.97") modes: N/A
  API: OpenGL v: 4.6.0 NVIDIA 535.104.05 renderer: NVIDIA GeForce GTX 1060
    6GB/PCIe/SSE2 direct-render: Yes

It is possible to use them with 240hz rate on this distro?

2

Shouldn’t it be GB2790QSU? I see xrandr is showing:

2560x1440     59.95 + 143.86*  119.88

This is 2k but not 240Hz. Your graphics card will need to support Display Port 1.4 video cable transfer speeds and quality of the cable does matter. Since it’s not showing 240Hz does your graphics card have the ability as i see it does 240Hz @ 1080p?

Edit:

1920x1080    239.76   119.88    60.00    59.94    50.00

Edit: I’m skeptical that it would. It will do a higher resolution but not at those frame rates.

Edit: You may be able to use xrandr to try and set that resolution with the higher refresh rate to see if it would work.

3

You have right i did small mistake - it’s GB2790QSU. It’s working on Endeavor with 240hz on 1080p.
I tried use xrandr to force 240hz on 2k using:

xrandr --output DP-0 --mode 2560x1440 --rate 240.00

Screen become black for few seconds and it’s come back again to 144hz.
And as i said - i have Windows 11 on my second disk in this PC and it’s working without any troubles on 2k with 240hz.

4

This is meaningless as it has no relevance to why it doesn’t work on linux. Did you try the rate set to what it shows in the output?

239.76
5

I just did - same result as with 240.00. Black screen for few seconds and coming back to 143.86 by xrandr -q

6

Does the screen blink black and then go back? What does this show?

cvt 2560 1440

7

It’s going black for like 2 seconds and coming back by self. I will compare this effect to changing resolution.

Output from cvt:

# 2560x1440 59.96 Hz (CVT 3.69M9) hsync: 89.52 kHz; pclk: 312.25 MHz
Modeline "2560x1440_60.00"  312.25  2560 2752 3024 3488  1440 1443 1448 1493 -hsync +vsync
8

Maybe setting a resolution and adding it? I don’t know. Just be careful as you don’t want to damage your equipment. (monitors)

https://wiki.archlinux.org/title/xrandr#Troubleshooting

Edit: It’s obvious the monitors can handle the refresh rate of 240 Hz.

1 Like
9

If that really can damage my monitors i won’t risk. They coast (at least for me) a small fortune :sweat_smile:
Maybe someone else will have other ideas. If nobody gonna guess reason then i will just stay with 144hz.

10

What desktop are you using?

11

I tried it on XFCE before (same results) and now i’m using GNOME.

12

Are you using Wayland on Gnome or X11?

13

X11. I heard from my friends that Wayland like to making troubles with teamviewer/anydesk or even flameshot. Never used it honestly.

14

Well I don’t know anything else to try other than adding and setting a new resolution. But, i don’t want to be responsible for damaging your hardware. I also have an Nvidia GTX 1060 but no monitors that do over 70 Hz. :wink:

15

Well, i hope i won’t be punished for small offtopic. I’m using linux mostly for work (oh irony, linux admin and some programming).
Some people saying they can’t see difference between 60-70 and for example 140hz. In my case i can see difference. And of course it’s hard to spot it using terminal or phpstorm, but watching videos or simple scrolling internet it’s so much… smoother. If u will be able in future to get “faster” screen i recommend you to do! Even some not triple A games are more funny to play (like for ex TF2).

Anyway i’m grateful for your time. Wish u best!

1 Like
16

Just out of curiosity does this show anything different?

cvt 2560 1440 240

17

Actually - it is.

# 2560x1440 239.88 Hz (CVT) hsync: 398.92 kHz; pclk: 1442.50 MHz
Modeline "2560x1440_240.00"  1442.50  2560 2800 3088 3616  1440 1443 1448 1663 -hsync +vsync
18

Hmm? I’m just not sure if I’m even using the commands properly? I just see this on another site this way. :man_shrugging:

19

I never used cvt before so i have no idea :smile:
But… i noticed it’s showing in first line “239.88 Hz”. So… i tried:

xrandr --output DP-0 --mode 2560x1440 --rate 239.88

Instead of 239.76 rate u told me before. And… nothing is happening after that command. Literally nothing. Even my screen it’s not turning black.
Maybe that mean something, but i don’t know what

20

I just try to follow the wiki but it’s not much help with explaining if you know what i mean. :laughing:

Edit: Where are all the gamers with their fast monitor settings? :wink: