linux-kernel - BISECTED: i915 0000:00:02.0: Device initialization failed (-19)

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Date:   Fri, 13 Aug 2021 13:10:08 +0200
From:   Harald Arnesen <harald@...gtun.org>
To:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:     Jason Ekstrand <jason@...kstrand.net>,
        Daniel Vetter <daniel.vetter@...ll.ch>
Subject: BISECTED: i915 0000:00:02.0: Device initialization failed (-19)

Kernel 5.14-rc4 and -rc5 give the following message on boot:

[    2.533418] i915 0000:00:02.0: Device initialization failed (-19)
[    2.533472] i915 0000:00:02.0: Please file a bug on drm/i915; see
https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs
for details.

And when I suspend the machine, the screen stays dark when resuming.

Bisected to the following commit:

commit 69de4421bb4c103ef42a32bafc596e23918c106f
Author: Jason Ekstrand <jason@...kstrand.net>
Date:   Wed Jul 21 10:23:57 2021 -0500

    drm/ttm: Initialize debugfs from ttm_global_init()

And reverting this fixes the problem.

This is on a Thinkpad T520, and "lspci" tells me the following about the
graphics card:

00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09)

.config is attached
-- 
Hilsen Harald

View attachment "config-5.14.0-rc5_catnip-00017-g761c6d7ec820" of type "text/plain" (142459 bytes)