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,