Resolution not available after reboot

Help
1

Hi, I am just configuring my first NixOS setup and I have a weird issue. I have a 2560x1080 monitor and I want everything to display in that resolution.

On initial power-on: TTY displays correctly at 2560x1080 with no graphics errors in dmesg.
After reboot: TTY resolution becomes stretched, with 1/5 of the screen not visible, and dmesg shows an error about unsupported mode. Here is the output of dmesg | grep i915:

[    0.890817] i915 0000:00:02.0: vgaarb: deactivate vga console
[    0.891441] i915 0000:00:02.0: vgaarb: VGA decodes changed: olddecodes=io+mem,decodes=io+mem:owns=io+mem
[    0.913688] [drm] Initialized i915 1.6.0 20201103 for 0000:00:02.0 on minor 1
[    1.174948] fbcon: i915drmfb (fb0) is primary device
[    1.174953] i915 0000:00:02.0: [drm] fb0: i915drmfb frame buffer device
[    1.754833] i915 0000:00:02.0: [drm] User-defined mode not supported: "2560x1080": 74 289609 2560 2736 3016 3472 1080 1081 1084 1127 0x20 0x6
[   26.475310] snd_hda_intel 0000:00:03.0: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])

I have video=HDMI-A-2:2560x1080@75 set in my kernel parameters. The GPU is integrated Intel graphics.

Why is this resolution suddenly not supported after reboot?

2

Hello
Could you please provide more information on you System (which hardware, compostitor, etc).
Also can you post you configuration

3

I managed to figure it out by myself. For some reason the driver incorrectly resolves available resolutions. I’ve changed video=HDMI-A-2:2560x1080@75 to video=HDMI-A-2:2560x1080@75e to force this resolution, and it started working. Now resolution is set to max on every startup, and TTY always displays in max resolution. Maybe it’s because of the shitty Lenovo BIOS.

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