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
