From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 140C1C433F5 for ; Tue, 16 Nov 2021 09:57:39 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CF2816322A for ; Tue, 16 Nov 2021 09:57:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org CF2816322A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=bugzilla.kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B890C6EE43; Tue, 16 Nov 2021 09:57:37 +0000 (UTC) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by gabe.freedesktop.org (Postfix) with ESMTPS id 515C26EE20 for ; Tue, 16 Nov 2021 09:57:37 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPS id 280166322A for ; Tue, 16 Nov 2021 09:57:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1637056657; bh=JcOwCXfmIu82oy8cZbUGMHkFtOrK9BKQGDdUxiUTdyc=; h=From:To:Subject:Date:In-Reply-To:References:From; b=G1zubvLpek+4pPhPnSGM/bhsHWDRF5x9A1XGfO5VS0YnLspLsup/pMGsw7DmDllmh gjlgu2ixRErGbndOaatfqIIorH13IWqzWsUMlyfoV1zUyA4p06g5wc7LaSglj4tAXj cf24NZvYXY4rMh5s1J+spMGI1YjFo4LzE6Bipjd9Vbm4JVrMWRsc6CxhCiAQ8V5u5P PWjAeb6UsyqA/VsJej174eq/Nm6X3BFmC4nzuM0Mh+oQ8ulZRKWdPNUbF/PVvLlONH IvEZZKr4zTmfrtybgX5fF4C4d1f32JsSDI/QsNZZ+Q+48d3NuopZB5FXWzv2JKIobq GmnCp3zcMt+Ng== From: bugzilla-daemon@bugzilla.kernel.org To: dri-devel@lists.freedesktop.org Subject: [Bug 215001] Regression in 5.15, Firmware-initialized graphics console selects FB_VGA16, screen corruption Date: Tue, 16 Nov 2021 09:57:36 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Drivers X-Bugzilla-Component: Video(Other) X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: aros@gmx.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: drivers_video-other@kernel-bugs.osdl.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" https://bugzilla.kernel.org/show_bug.cgi?id=3D215001 --- Comment #2 from Artem S. Tashkinov (aros@gmx.com) --- CC'ing the relevant mailing list. > A regression in kernel 5.15 causes FB_VGA16 (vga16fb) to fail to detect t= hat > it has been passed a firmware-initialized graphics bitmap instead of a > character-mapped 80x25 display. It takes ownership of the console, inste= ad > of passing control to FB_EFI, FB_VESA, FB_SIMPLE and so on. This results= in > writing ASCII bytes into the RGB bitmap, with random bits appearing in the > first few scanlines of the screen. (The remainder of the screen is > untouched, e.g. Grub's window saying it is loading the Linux kernel.) >=20 > Once udevd loads the appropriate modesetting driver (in my case, amdgpu),= the > graphics screen is (re)initialized properly and becomes usable. >=20 > Kernel config options CONFIG_SYSFB_SIMPLEFB, CONFIG_FB_SIMPLE, CONFIG_FB_= EFI, > and CONFIG_FB_VESA had no effect when toggled on and off. >=20 > Workaround: Disabling CONFIG_FB_VGA16 blocks vga16fb from grabbing the > console, allowing the EFI framebuffer to properly take ownership of the > console. >=20 > This bug is a duplicate of #214603. Credit goes to that reporter for > disabling FB_VGA16 as a workaround. I would have updated that report rat= her > than file a duplicate, except that #214603 does not have its metadata > (product, component, version, regression, or even its summary fields) set > correctly. Hopefully this new report will be seen by the correct > maintainers. --=20 You may reply to this email to add a comment. You are receiving this mail because: You are on the CC list for the bug.=