can't change resolution to 3440x1440 for dell ultrawide monitor

wolframen · 2023-12-29 21:35:08

Hi,
I got a new Dell S3422DW 34" Monitor and, while it works just fine with every windows laptop that I tried, I cant get my Arch installation to display in the correct resolution.
I have an OPTIMUS laptop running a NVIDIA GeForce GTX 1650 Mobile / Max-Q and a Intel TigerLake-LP GT2 [Iris Xe Graphics].
newest drivers via nvidia-dkms.
So the xfce and also kde display-settings only give me 3840x2160, xrandr as well.

so I tried adding the 3440x1440 manually with xrandr:

 
$cvt 3440 1440
 3440x1440 59.94 Hz (CVT) hsync: 89.48 kHz; pclk: 419.50 MHz
Modeline "3440x1440_60.00"  419.50  3440 3696 4064 4688  1440 1443 1453 1493 -hsync +vsync

xrandr --newmode "3440x1440_60" 419.50  3440 3696 4064 4688  1440 1443 1453 1493 -hsync +vsync

xrandr --addmode HDMI1 3440x1440_60

xrandr --output HDMI1 --mode 3440x1440_60

and then it just fails and goes back to ugly

I tried this in nvidia, intel and hybrid optimus modes

also I cant change the resolution in nvidia-settings, it just tells me it is a "PRIME-screen" and can only be changed by randr.

thanks in advance if anyone can figure out what is causing my problem

UPDATE: it works on 30Hz. The monitor is supposed to go to 100 and I would need at least 60Hz

Last edited by wolframen (2023-12-29 22:05:39)

seth · 2023-12-29 23:18:26

% cvt12 3440 1440 60 -b                    
# 3440x1440 @ 60.000 Hz Reduced Blank (CVT) field rate 60.000 Hz; hsync: 88.860 kHz; pclk: 312.79 MHz
Modeline "3440x1440_60.00_rb2"  312.79  3440 3448 3480 3520  1440 1467 1475 1481 +hsync -vsync

And please post your xorg log

with every windows laptop that I tried

isn't really relevant, 3440x1440@60 is gonna require HDMI 2.1 and an (sigh) "HDMI Premium High Speed" or (SIGH!) "HDMI Ultra High Speed" cable
The fact that it works at 30Hz very much suggests an issue here. Try DP.

wolframen · 2023-12-29 23:36:01

seth wrote:

% cvt12 3440 1440 60 -b                    
# 3440x1440 @ 60.000 Hz Reduced Blank (CVT) field rate 60.000 Hz; hsync: 88.860 kHz; pclk: 312.79 MHz
Modeline "3440x1440_60.00_rb2"  312.79  3440 3448 3480 3520  1440 1467 1475 1481 +hsync -vsync
And please post your xorg log
with every windows laptop that I tried
isn't really relevant, 3440x1440@60 is gonna require HDMI 2.1 and an (sigh) "HDMI Premium High Speed" or (SIGH!) "HDMI Ultra High Speed" cable
The fact that it works at 30Hz very much suggests an issue here. Try DP.

% cvt12 3440 1440 60 -b

didnt work, I will try and find some ultra mega highspeed HDMI cable tomorrow, my laptop has no DP (maybe via thunderbolt?)

also, heres my xorg log

http://0x0.st/HEtG.txt

Thanks!

seth · 2023-12-29 23:59:52

[  5358.439] (II) intel(0): switch to mode 3440x1440@50.0 on HDMI1 using pipe 1, position (1920, 0), rotation normal, reflection none

1. remove xf86-video-intel
2. Right now that looks like HDMI 1.4 or "only" (:rolleyes:) an "HDMI High Speed" cable (just in case: the marketing BS is the official grading for hdmi cables; there're no numbers and they're only loosely related to the standard versions)

Last edited by seth (2023-12-30 00:00:02)

wolframen · 2023-12-30 11:51:54

seth wrote:

[  5358.439] (II) intel(0): switch to mode 3440x1440@50.0 on HDMI1 using pipe 1, position (1920, 0), rotation normal, reflection none
1. remove xf86-video-intel
2. Right now that looks like HDMI 1.4 or "only" (:rolleyes:) an "HDMI High Speed" cable (just in case: the marketing BS is the official grading for hdmi cables; there're no numbers and they're only loosely related to the standard versions)

removing intel didnt change anything

seth · 2023-12-30 14:38:08

I frankly didn't expect it - it's mostly because

[  5207.317] (II) intel(0): Using Kernel Mode Setting driver: i915, version 1.6.0 20201103
[  5207.327] (II) intel(0): [DRI2]   DRI driver: i965
[  5207.355] (EE) AIGLX error: dlopen of /usr/lib/dri/i965_dri.so failed (/usr/lib/dri/i965_dri.so: cannot open shared object file: No such file or directory)
[  5207.355] (EE) AIGLX error: unable to load driver i965
[  5207.369] (II) IGLX: Loaded and initialized swrast
[  5207.369] (II) GLX: Initialized DRISWRAST GL provider for screen 0

otherwise also your GL is broken.

If the HW advertises HDMI >= 2.0 this is most likely because of the cable, especially if it's only "high speed"

Arch Linux

#1 2023-12-29 21:35:08

can't change resolution to 3440x1440 for dell ultrawide monitor

#2 2023-12-29 23:18:26

Re: can't change resolution to 3440x1440 for dell ultrawide monitor

#3 2023-12-29 23:36:01

Re: can't change resolution to 3440x1440 for dell ultrawide monitor

#4 2023-12-29 23:59:52

Re: can't change resolution to 3440x1440 for dell ultrawide monitor

#5 2023-12-30 11:51:54

Re: can't change resolution to 3440x1440 for dell ultrawide monitor

#6 2023-12-30 14:38:08

Re: can't change resolution to 3440x1440 for dell ultrawide monitor

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