From: Javier Martinez Canillas <firstname.lastname@example.org> To: Thorsten Leemhuis <email@example.com>, Harald Dunkel <firstname.lastname@example.org> Cc: Kernel Mailing List <email@example.com>, firstname.lastname@example.org, Thomas Zimmermann <email@example.com>, "firstname.lastname@example.org" <email@example.com> Subject: Re: 5.15 regression: CONFIG_SYSFB_SIMPLEFB breaks console scrolling Date: Fri, 3 Dec 2021 12:20:25 +0100 [thread overview] Message-ID: <firstname.lastname@example.org> (raw) In-Reply-To: <email@example.com> 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
next prev parent reply other threads:[~2021-12-03 11:20 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-11-16 4:52 Harald Dunkel 2021-11-21 11:47 ` Thorsten Leemhuis 2021-11-25 12:00 ` Thorsten Leemhuis 2021-12-03 10:40 ` Thorsten Leemhuis 2021-12-03 11:20 ` Javier Martinez Canillas [this message] 2021-12-05 6:56 ` Thorsten Leemhuis
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