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#1 2018-12-13 11:04:50

knovoselic
Member
Registered: 2018-12-13
Posts: 16

[SOLVED] Unable to boot into graphical mode

Two weeks ago my PC was working fine. I didn't use it for two weeks, and today I've replaced MBO and GPU.

Please note that the MBO is pretty much the same (old one was ASUS Z97M-PLUS, new one is ASUS Z97-AR). The old GPU was GTX 970, new one is GTX 1070 TI. That shouldn't matter, as I've chosen integrated GPU in BIOS, do not have nvidia drivers installed and have nouveau driver blacklisted. Also, I have isolated the Nvidia GPU using the following kernel param: vfio-pci.ids. I've tried with it and without it, the result is the same.

In grub config, GRUB_GFXMODE is set to auto and GRUB_GFXPAYLOAD_LINUX is set to keep. In /etc/mkinitcpio.conf I've added i915 to the modules list. This was my config before the hardware swap and everything has worked perfectly.
Now I can't boot into GUI at all. I've tried various variations of the mentioned configs above (disabling early KMS, adding intel_agp before i915 module, removing i915 module), but with no luck. Every time it looks like the system boots (not really sure), but GUI doesn't show up. At first I can see kernel logs normall, then the screen clears and remaining text is written diagonally and is flickering. Here's a video:
https://photos.app.goo.gl/pX4bSVjz6KMdb5tM9

In this mode, I'm also unable to switch into a console using CTRL+ALT+2 (or any other keyboard combination). As you can see at the end of the video, I was able to restart the machine using CTRL+ALT+DEL.

Adding nomodeset i915.modeset=0 to the kernel params gets rid of the blinking and I can use a TTY, but ofc GUI does not work.

I'm stuck, have no idea how to debug or fix this. Any help would be appreciated, I'd really had to start from scratch. Also, now I'm really curious what went wrong and how I can fix it.

Last edited by knovoselic (2018-12-13 12:48:21)

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#2 2018-12-13 12:05:19

seth
Member
Registered: 2012-09-03
Posts: 49,992

Re: [SOLVED] Unable to boot into graphical mode

Boot into the multi-user.target, https://wiki.archlinux.org/index.php/Sy … _boot_into
There dump a complete dmesg, https://wiki.archlinux.org/index.php/Pastebin
Also please elaborate on your actual graphical.target (display server & process, eg. some DM or xinit into what exact session type etc.)

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#3 2018-12-13 12:34:57

knovoselic
Member
Registered: 2018-12-13
Posts: 16

Re: [SOLVED] Unable to boot into graphical mode

Thanks, here's dmesg output: https://ptpb.pw/RdFP

I'm using lightdm as display manager and booting into KDE5 desktop.

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#4 2018-12-13 12:48:02

knovoselic
Member
Registered: 2018-12-13
Posts: 16

Re: [SOLVED] Unable to boot into graphical mode

Agrrrr, finally figured it out. Thanks seth for trying to help. Your question about which DM I'm using reminded me that I've had custom display-setup and session-setup scripts set in lightDM, which run xrandr. For some reason instead of just not setting requested resolution or failing with an error, it was doing what could be seen on the video.

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