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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3CF3EC433EF for ; Fri, 3 Dec 2021 11:20:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1380372AbhLCLX4 (ORCPT ); Fri, 3 Dec 2021 06:23:56 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:35997 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1380355AbhLCLXx (ORCPT ); Fri, 3 Dec 2021 06:23:53 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1638530429; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=TCEoUW7+u756imTky0jSFPok8S0L4DifBezJf8rr5n4=; b=PuS6xFLxV1vCf/2kAn99xhjNTYMHbJO95+YgxuqiWzRXiP3/g3t9TNP/O9pBORi5NbGdNf i786d9QN9f7IRte6OldhBEumTNRfVHymOI72iykO8de2uX13jAlNzx7DJQou+OxIF0lv6r DrMuasb/H1Pq1Y9D3QAECJWgxZOStF0= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-424-b2WqoSpaOva9wacIzbDTsw-1; Fri, 03 Dec 2021 06:20:28 -0500 X-MC-Unique: b2WqoSpaOva9wacIzbDTsw-1 Received: by mail-wm1-f71.google.com with SMTP id 201-20020a1c04d2000000b003335bf8075fso1418106wme.0 for ; Fri, 03 Dec 2021 03:20:28 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=TCEoUW7+u756imTky0jSFPok8S0L4DifBezJf8rr5n4=; b=M4jo5UMH6mndrwskIlQTHUh0XEHKIkEWC0d59B6JYWSZtaIOe+wmmxE9C/B2KpeOj3 kyB3JL8fi04sQ5/noQ5ZxW/1HCHchZZmgKj4WmHzygSNNKeXnKuqJMlMBIoUarEJGZLb FL8c9G6kQDRNdmeHNQfJTBLiGhjAii0A4hNiYA9LQT1IS8tWJ9fnc4nsHoB0zPoVV5KB GHEHlOkjIzlBYXqEABz8PNgk6eyqxnYpy8bm+7FSUeg+NRLD6CeI8LD1zyC+UltifuOk wh7y0u/w+Ep51JvOuLhEOi3dk+I7qt23e2oYhsl3fdkLnGQhJed29F2QQYeO+KRyv8QQ BxhQ== X-Gm-Message-State: AOAM530DyI8REHGxcycH8gaZKFYq4WWHusQ0kBbV3WNAXKqO04kDJY7k UF5u3cWegG4wcni7TJtFOXMUVSqtmFpazbrirVecFbN3ozAFj7K89S0ptqXV+iNEk3KIfs0noLO 5ZYK00r2/hVIun8RJsu4OVIBb X-Received: by 2002:adf:edc6:: with SMTP id v6mr21051556wro.461.1638530427173; Fri, 03 Dec 2021 03:20:27 -0800 (PST) X-Google-Smtp-Source: ABdhPJwJM87rlYiWw2QEKek+Z+Eku0ybwl3FqjSXdx/b5RzJmEzD14yUo8rrlrytrDw1uCbfb3NIDA== X-Received: by 2002:adf:edc6:: with SMTP id v6mr21051531wro.461.1638530426960; Fri, 03 Dec 2021 03:20:26 -0800 (PST) Received: from [192.168.1.102] ([92.176.231.205]) by smtp.gmail.com with ESMTPSA id o12sm2667241wmq.12.2021.12.03.03.20.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 03 Dec 2021 03:20:26 -0800 (PST) Message-ID: <5de368f7-91cd-5998-9fe4-1bf448e32742@redhat.com> Date: Fri, 3 Dec 2021 12:20:25 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.3.0 Subject: Re: 5.15 regression: CONFIG_SYSFB_SIMPLEFB breaks console scrolling Content-Language: en-US To: Thorsten Leemhuis , Harald Dunkel Cc: Kernel Mailing List , dri-devel@lists.freedesktop.org, Thomas Zimmermann , "regressions@lists.linux.dev" References: <4bf94684-6410-db9f-5bec-ea0540a2ea76@leemhuis.info> From: Javier Martinez Canillas In-Reply-To: <4bf94684-6410-db9f-5bec-ea0540a2ea76@leemhuis.info> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Sorry for the late reply. On 11/21/21 12:47, Thorsten Leemhuis wrote: > Hi, this is your Linux kernel regression tracker speaking. > > On 16.11.21 05:52, Harald Dunkel wrote: >> >> if I enable CONFIG_SYSFB_SIMPLEFB in 5.15.2 and use grub's default >> configuration >> (Debian sid amd64), then a few lines at the bottom of /dev/tty1 including >> login prompt are off-screen. Scrolling is broken. I can login, though. >> >> Enabling GRUB_TERMINAL=console in grub doesn't make a difference. Using >> the same kernel except for CONFIG_SYSFB_SIMPLEFB the problem is gone. >> >> Graphics card is a GeForce GTX 1650. I tried with both CONFIG_DRM_NOUVEAU >> and proprietary graphics drivers disabled. >> >> Attached you can find the config file. Please mail if I can help to track >> this problem down. > > Thx for the report. I'm not totally sure if this is a regression, as > that's a new config option. But it might be one considered a successor > to an older one, hence it might count as regression. Adding two > developers and a mailing list to the CC, hopefully someone can clarify. > I don't think this is a regression since enabling CONFIG_SYSFB_SIMPLEFB will make the simpledrm driver to be bound while disabling the option makes the efifb driver to be bound instead. Yes, it seems to be a bug in the simpledrm driver but the solution if you have issues with the simpledrm is to not enable CONFIG_SYSFB_SIMPLEFB and keep using the old fbdev driver. Best regards, -- Javier Martinez Canillas Linux Engineering Red Hat