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Date:   Mon, 17 Feb 2020 22:08:52 +0100
From:   Boris Brezillon <>
To:     Dominik Brodowski <>
Subject: Re: drm/bridge and lockup on boot

On Mon, 17 Feb 2020 21:09:42 +0100
Dominik Brodowski <> wrote:

> On my old Dell XPS 13 laptop with
> 00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09)
> 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09) (prog-if 00 [VGA controller])
> booting 5.6-rc1 and -rc2 fails after the dmesg line
> 	fb0: switching to inteldrmfb from simple
> while the next lines should be something like (v5.5):
> 	Console: switching to colour dummy device 80x25
> 	i915 0000:00:02.0: vgaarb: deactivate vga console
> 	[drm] ACPI BIOS requests an excessive sleep of 25000 ms, using 1500 ms instead
> 	[drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
> 	[drm] Driver supports precise vblank timestamp query.
> 	i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem
> A git bisect lead to
> 	commit b86d895524ab ("drm/bridge: Add an ->atomic_check() hook")

This commit has been reverted: you should ignore any failures between
b86d895524ab ("drm/bridge: Add an ->atomic_check() hook") and
099126352303 ("Revert "drm/bridge: Add a drm_bridge_state object").

> as the first bad commit, as unlikely as that sounds. f7619a58ef92 is good,
> as is bf046007641a, and 3cacb2086e41 is definitely broken on my setup.
> Any ideas?
> Oh, and this might be the same issue as reported here:
> though I do not see such a warning, but nothing new once the line "fb0: switching
> to inteldrmfb from simple" is printed.
> Thanks,
> 	Dominik

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