Salutations!
I am running Pop!_OS 21.04 x86_64, my GPU is NVIDIA GeForce RTX 2080, and I have a 4k ultrawide 100hz monitor connected through DisplayPort. My driver version is 470.57.02.
At the native 3440x1440 resolution, everything is working just fine at 100hz.
However, none of the lower resolutions have a 100hz option.
I attempted to add custom resolutions through xrandr, but kept getting the BadMatch error, later found out it’s the nvidia driver that’s blocking this.
To be clear, I am attempting to add lower resolutions at 100hz for some applications such as games, as 4k isn’t always easy on the GPU.
What confuses me the most is that the 3440x1440 resolution offers 100hz / 60hz / 50hz, all others except for ones below 1152x864 offer only 60hz; ones below that sometimes go up to 75hz.
Does anyone have experience with this? All and any help would be appreciated.
Can you please run sudo nvidia-bug-report.sh and attach the log here?
The list of supported resolutions and their refresh rates comes from the monitor’s EDID. Just because the monitor supports 100 Hz at one resolution doesn’t necessarily mean that it supports that refresh rate at all supported resolutions. If you want to force the driver to use a 100 Hz mode anyway you can set the various ModeValidation and ExactModeTimingsDVI overrides, although your monitor may or may not handle that well.
If you want to use the GPU to scale to the monitor’s native 100 Hz mode, you can do that with xrandr (xrandr --output <whatever> --mode 3840x1440 --rate 100 --scale-from <w>x<h>) or by setting the MetaMode directly (nvidia-settings -a CurrentMetaMode="nvidia-auto-select { ViewPortIn=<w>x<h> }").
Thanks for the reply!
Here’s the log: nvidia-bug-report.log.gz (470.9 KB)
I have used this monitor before with MacOS & Windows and they both were able to handle the 100hz refresh rate at any given resolution, however, I don’t know if they were just scaling the native resolution or not.
Could you please elaborate on the ModeValidation option — what property should I be setting? Would it be “NoVertRefreshCheck” or some other?
Again, many thanks for your help so far!
Yeah, looking at the decoded version of your EDID, it does seem to only have one 100 Hz mode. It’s definitely likely that the other operating systems were simply scaling the other resolutions to that one native mode.
Block 0, Base EDID:
EDID Structure Version & Revision: 1.4
Vendor & Product Identification:
Manufacturer: SAM
Model: 3621
Serial Number: 810693424
Made in: week 41 of 2019
Basic Display Parameters & Features:
Digital display
Bits per primary color channel: 8
DisplayPort interface
Maximum image size: 80 cm x 33 cm
Gamma: 2.20
DPMS levels: Off
Supported color formats: RGB 4:4:4, YCrCb 4:4:4, YCrCb 4:2:2
First detailed timing includes the native pixel format and preferred refresh rate
Color Characteristics:
Red : 0.6552, 0.3300
Green: 0.3203, 0.6005
Blue : 0.1455, 0.0703
White: 0.3134, 0.3291
Established Timings I & II:
IBM : 720x400 70.082 Hz 9:5 31.467 kHz 28.320 MHz
DMT 0x04: 640x480 59.940 Hz 4:3 31.469 kHz 25.175 MHz
Apple : 640x480 66.667 Hz 4:3 35.000 kHz 30.240 MHz
DMT 0x05: 640x480 72.809 Hz 4:3 37.861 kHz 31.500 MHz
DMT 0x06: 640x480 75.000 Hz 4:3 37.500 kHz 31.500 MHz
DMT 0x08: 800x600 56.250 Hz 4:3 35.156 kHz 36.000 MHz
DMT 0x09: 800x600 60.317 Hz 4:3 37.879 kHz 40.000 MHz
DMT 0x0a: 800x600 72.188 Hz 4:3 48.077 kHz 50.000 MHz
DMT 0x0b: 800x600 75.000 Hz 4:3 46.875 kHz 49.500 MHz
Apple : 832x624 74.551 Hz 4:3 49.726 kHz 57.284 MHz
DMT 0x10: 1024x768 60.004 Hz 4:3 48.363 kHz 65.000 MHz
DMT 0x11: 1024x768 70.069 Hz 4:3 56.476 kHz 75.000 MHz
DMT 0x12: 1024x768 75.029 Hz 4:3 60.023 kHz 78.750 MHz
DMT 0x24: 1280x1024 75.025 Hz 5:4 79.976 kHz 135.000 MHz
Apple : 1152x870 75.062 Hz 192:145 68.681 kHz 100.000 MHz
Standard Timings:
DMT 0x15: 1152x864 75.000 Hz 4:3 67.500 kHz 108.000 MHz
DMT 0x1c: 1280x800 59.810 Hz 16:10 49.702 kHz 83.500 MHz
DMT 0x55: 1280x720 60.000 Hz 16:9 45.000 kHz 74.250 MHz
DMT 0x23: 1280x1024 60.020 Hz 5:4 63.981 kHz 108.000 MHz
DMT 0x2f: 1440x900 59.887 Hz 16:10 55.935 kHz 106.500 MHz
DMT 0x53: 1600x900 60.000 Hz 16:9 60.000 kHz 108.000 MHz (RB)
DMT 0x3a: 1680x1050 59.954 Hz 16:10 65.290 kHz 146.250 MHz
Detailed Timing Descriptors:
DTD 1: 3440x1440 59.973 Hz 43:18 88.819 kHz 319.750 MHz (797 mm x 333 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 10 Vback 28 Vpol N
Display Range Limits:
Monitor ranges (GTF): 50-100 Hz V, 30-152 kHz H, max dotclock 550 MHz
Display Product Name: 'C34H89x'
Display Product Serial Number: 'HTOMA00759'
Extension blocks: 1
Checksum: 0xe7
----------------
Block 1, CTA-861 Extension Block:
Revision: 3
Underscans IT Video Formats by default
Basic audio support
Supports YCbCr 4:4:4
Supports YCbCr 4:2:2
Native detailed modes: 1
Video Data Block:
VIC 16: 1920x1080 60.000 Hz 16:9 67.500 kHz 148.500 MHz (native)
VIC 31: 1920x1080 50.000 Hz 16:9 56.250 kHz 148.500 MHz
VIC 4: 1280x720 60.000 Hz 16:9 45.000 kHz 74.250 MHz
VIC 19: 1280x720 50.000 Hz 16:9 37.500 kHz 74.250 MHz
VIC 3: 720x480 59.940 Hz 16:9 31.469 kHz 27.000 MHz
VIC 18: 720x576 50.000 Hz 16:9 31.250 kHz 27.000 MHz
VIC 90: 2560x1080 60.000 Hz 64:27 66.000 kHz 198.000 MHz
Audio Data Block:
Linear PCM:
Max channels: 2
Supported sample rates (kHz): 48 44.1 32
Supported sample sizes (bits): 24 20 16
Speaker Allocation Data Block:
FL/FR - Front Left/Right
Detailed Timing Descriptors:
DTD 2: 3440x1440 99.982 Hz 43:18 150.972 kHz 543.500 MHz (797 mm x 333 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 10 Vback 57 Vpol N
DTD 3: 3440x1440 49.987 Hz 43:18 73.681 kHz 265.250 MHz (797 mm x 333 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 10 Vback 21 Vpol N
DTD 4: 2560x1440 59.951 Hz 16:9 88.787 kHz 241.500 MHz (797 mm x 333 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 5 Vback 33 Vpol N
DTD 5: 1920x1080 60.000 Hz 16:9 67.500 kHz 148.500 MHz
Hfront 88 Hsync 44 Hback 148 Hpol P
Vfront 4 Vsync 5 Vback 36 Vpol P
DTD 6: 2560x1080 60.000 Hz 64:27 66.000 kHz 198.000 MHz (797 mm x 333 mm)
Hfront 248 Hsync 44 Hback 148 Hpol P
Vfront 4 Vsync 5 Vback 11 Vpol P
Checksum: 0x4c
If you really want to override mode selection, you’ll definitely need AllowNonEdidModes. You might need others too, depending on how your custom mode goes through mode validation. You’ll want to set Option "ModeDebug" in xorg.conf and then you can check the X log to see if your custom mode was rejected, and if so, why.
I see, thanks.
One final question — is it possible to save these scaled resolutions in nvidia-settings for convenience sake?
It’d be preferable if I didn’t have to make custom shell scripts for this and could simply find these scaled modes in settings when I wish for them, however, not sure how to go about this.
You’ve helped me immensely so far, until today I didn’t know that monitors could only support the highest refresh rate only at highest resolution. Many thanks again!