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From: Mikael Pettersson <>
To: Linux Kernel list <>
	Jason Ekstrand <>,
	Daniel Vetter <>
Subject: [BISECTED] 5.14.0-rc4 broke drm/ttm when !CONFIG_DEBUG_FS
Date: Mon, 2 Aug 2021 19:16:52 +0200	[thread overview]
Message-ID: <> (raw)

Booting 5.14.0-rc4 on my box with Radeon graphics breaks with

[drm:radeon_ttm_init [radeon]] *ERROR* failed initializing buffer
object driver(-19).
radeon 0000:01:00.0: Fatal error during GPU init

after which the screen goes black for the rest of kernel boot and
early user-space init.
Once the console login shows up the screen is in some legacy low-res
mode and Xorg can't be started.

A git bisect between v5.14-rc3 (good) and v5.14-rc4 (bad) identified

# first bad commit: [69de4421bb4c103ef42a32bafc596e23918c106f]
drm/ttm: Initialize debugfs from ttm_global_init()

Reverting that from 5.14.0-rc4 gives me a working kernel again.

Note that I have
# CONFIG_DEBUG_FS is not set


             reply	other threads:[~2021-08-02 17:17 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-02 17:16 Mikael Pettersson [this message]
2021-08-02 18:29 ` Duncan
2021-08-03  6:54   ` Mikael Pettersson
2021-08-16 14:30 ` [PATCH] drm/ttm: allow debugfs_create_file() to fail in ttm_global_init() lnx7586
2021-08-19 22:38   ` Duncan

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