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olifurz

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From: United Kingdom

Registered: 2026-04-03

Posts: 15

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Nouveau crashes on Ampere when using interlaced resolution

UPDATE: I tried NVidia and found that my card does not support interlacing with the proprietary drivers. My card cuts out when outputting an interlaced resolution on Nouveau aswell so it may just be a card related issue. Thanks NVidia
I've recently got a nice CRT monitor (HP 7550 for those who are curious) connected to a RTX 3060 with a DP2VGAHD20 adapter, when trying to add any modeline with xrandr --newmode & appending "interlace" to the end of it, then finally applying it in XFCE, my monitor switches to idle and XFCE doesn't return back to the original resolution (which is probably a sign that something has broken). Trying to switch to a tty does nothing

About the same time is a nouveau error as follows

Apr 18 16:12:08 arch kernel: nouveau 0000:09:00.0: gsp: Xid:56 CMDre 00000000 00002008 00000001 00000
004 00080000
Apr 18 16:12:08 arch kernel: nouveau 0000:09:00.0: gsp: Xid:56 CMDre 00000000 00000200 00000001 00000
005 00000001
Apr 18 16:12:10 arch kernel: nouveau 0000:09:00.0: drm: core notifier timeout
Apr 18 16:12:12 arch kernel: nouveau 0000:09:00.0: drm: wndw-0: timeout

Progressive resolutions work fine, I'm just aiming to get that interlaced 120hz possible with this monitor. Is this just a bug with nouveau?

Last edited by olifurz (2026-04-19 22:06:05)

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seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 74,654

Re: Nouveau crashes on Ampere when using interlaced resolution

trying to add any modeline with xrandr --newmode & appending "interlace" to the end of it

This is not how this works, you'll have to generate a proper interlaced modeline.

for OUT in /sys/class/drm/card*; do echo $OUT; edid-decode $OUT/edid; echo "================="; done

You'll need https://archlinux.org/packages/extra/x86_64/v4l-utils/

◉ cvt12 1024 768 60 -i                    
# 1024x768 @ 60.000 Hz Interlaced (CVT) field rate 59.834 Hz; hsync: 24.023 kHz; pclk: 30.75 MHz
Modeline "1024x768_60.00i"  30.75  1024 1056 1152 1280  768 771 775 785 Interlace  -hsync +vsync

is interlaced XGA

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