From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from wp530.webpack.hosteurope.de (wp530.webpack.hosteurope.de [80.237.130.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 31F082C80 for ; Sun, 5 Dec 2021 06:56:23 +0000 (UTC) Received: from ip4d173d4a.dynamic.kabel-deutschland.de ([77.23.61.74] helo=[192.168.66.200]); authenticated by wp530.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) id 1mtlRU-0007SW-AZ; Sun, 05 Dec 2021 07:56:12 +0100 Message-ID: Date: Sun, 5 Dec 2021 07:56:11 +0100 Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: 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-BW To: Javier Martinez Canillas , 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> <5de368f7-91cd-5998-9fe4-1bf448e32742@redhat.com> From: Thorsten Leemhuis In-Reply-To: <5de368f7-91cd-5998-9fe4-1bf448e32742@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-bounce-key: webpack.hosteurope.de;regressions@leemhuis.info;1638687383;7cb8be3d; X-HE-SMSGID: 1mtlRU-0007SW-AZ Hi, this is your Linux kernel regression tracker speaking. On 03.12.21 12:20, Javier Martinez Canillas wrote: > 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. Mandy thx for the answer, Javier. Harald is quiet for some time already and didn't object so far, hence I'll remove this from regzbot: #regzbot invalid: problem caused by a new CONFIG option Ciao, Thorsten P.S.: As a Linux kernel regression tracker I'm getting a lot of reports on my table. I can only look briefly into most of them. Unfortunately therefore I sometimes will get things wrong or miss something important. I hope that's not the case here; if you think it is, don't hesitate to tell me about it in a public reply. That's in everyone's interest, as what I wrote above might be misleading to everyone reading this; any suggestion I gave they thus might sent someone reading this down the wrong rabbit hole, which none of us wants. BTW, I have no personal interest in this issue, which is tracked using regzbot, my Linux kernel regression tracking bot (https://linux-regtracking.leemhuis.info/regzbot/). I'm only posting this mail to get things rolling again and hence don't need to be CC on all further activities wrt to this regression.