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#1 2018-02-19 19:49:23

AndreasGB
Member
Registered: 2016-01-05
Posts: 18

T440p crashes after reboot on switching to inteldrmfb from EFI VGA

Dear community,

I just rebooted my laptop after maybe a week and did an upgrade before. Now, when I try to boot, the system freezes when booting normally. I passed loglevel=7 and it displays me as last four messages before the freeze:

[11.268367] i915 0000:00:02.0: enabling device (0006 -> 0007)
[11.273748] [drm] Memory usable by graphics device = 2048M
Starting Update UTMP about System Boot/Shutdown....
[11.275607] fb: switching to inteldrmfb from EFI VGA

When I run the system with nomodeset, I can get to the terminal login prompt. My guess that this is all related to the graphics drivers somehow, but I do not know how to proceed now.

Kind regards,

AndreasGB

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#2 2018-02-19 19:53:00

loqs
Member
Registered: 2014-03-06
Posts: 9,062

Re: T440p crashes after reboot on switching to inteldrmfb from EFI VGA

Which kernel version is the system using with the issue and what was the version without the issue?  If you downgrade just the kernel to the known good version does the issue cease?

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#3 2018-02-19 21:17:58

AndreasGB
Member
Registered: 2016-01-05
Posts: 18

Re: T440p crashes after reboot on switching to inteldrmfb from EFI VGA

Thanks for your reply loqs!

linux-4.14.15-1 works, linux-4.15.3-2 is broken. How can I help debug this?

Kind regards,

AndreasGB

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#4 2018-02-19 21:29:35

loqs
Member
Registered: 2014-03-06
Posts: 9,062

Re: T440p crashes after reboot on switching to inteldrmfb from EFI VGA

Try blacklisting nvidiafb.

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#5 2018-02-19 22:03:15

AndreasGB
Member
Registered: 2016-01-05
Posts: 18

Re: T440p crashes after reboot on switching to inteldrmfb from EFI VGA

This fixed it, too. Is that a known bug?

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#6 2018-02-19 22:09:58

loqs
Member
Registered: 2014-03-06
Posts: 9,062

Re: T440p crashes after reboot on switching to inteldrmfb from EFI VGA

https://bbs.archlinux.org/viewtopic.php?id=234646 seems the config changes in linux-4.15.3-2 is causing issues.
Edit:
You could report it on the arch bugtracker see if the maintainers will consider reverting the config changes.

Last edited by loqs (2018-02-19 22:11:08)

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#7 2018-02-19 23:09:25

AndreasGB
Member
Registered: 2016-01-05
Posts: 18

Re: T440p crashes after reboot on switching to inteldrmfb from EFI VGA

Hmm, but is this an Arch problem or an upstream one?

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#8 2018-02-19 23:47:12

loqs
Member
Registered: 2014-03-06
Posts: 9,062

Re: T440p crashes after reboot on switching to inteldrmfb from EFI VGA

That can probably only be answered by upstream.  However if the benefits of the config changes linux-4.15.3-2 introduced do not outweigh these current issues then why not revert the change.
None of the options changed is new with 4.15 see:
https://git.archlinux.org/svntogit/pack … 069c84aaec
https://cateee.net/lkddb/web-lkddb/X86_SYSFB.html
https://cateee.net/lkddb/web-lkddb/FB_NVIDIA.html
https://cateee.net/lkddb/web-lkddb/FB_NVIDIA_I2C.html
https://cateee.net/lkddb/web-lkddb/FB_N … LIGHT.html
https://cateee.net/lkddb/web-lkddb/FB_RIVA.html
https://cateee.net/lkddb/web-lkddb/FB_RIVA_I2C.html
https://cateee.net/lkddb/web-lkddb/FB_R … LIGHT.html
Edit:
Already reverted from 4.15.3-2 the BBR changes https://bugs.archlinux.org/task/57476

Last edited by loqs (2018-02-20 00:50:24)

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#9 2018-02-20 05:25:24

titan-c
Member
From: Paris
Registered: 2014-03-30
Posts: 4
Website

Re: T440p crashes after reboot on switching to inteldrmfb from EFI VGA

Thank you for this post. Indeed blacklisting nvidiafb fixes the problem. loqs thank you for the link to the option of nvidiafb, I see I don't need it for my graphics chip, it seems it supports quite old chips only.

Before finding this post I found on reddit https://www.reddit.com/r/archlinux/comm … el_update/ that setting the kernel option intel_iommu=igfx_off also fixes the issues. It does for me at least.

I tried both solutions individually and both work. I did not try them at the same time. I think blacklisting nvidiafb is a better solution on modern chips. I guess the issue arises in modern laptops with hybrid GPUs intel/nvidia

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#10 2018-02-20 09:23:40

AndreasGB
Member
Registered: 2016-01-05
Posts: 18

Re: T440p crashes after reboot on switching to inteldrmfb from EFI VGA

I reported the problem now in the Arch bug tracker: https://bugs.archlinux.org/task/57578

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