On 1/19/22 15:01, Linus Torvalds wrote:
On Wed, Jan 19, 2022 at 2:29 PM Helge Deller deller@gmx.de wrote:
Ah, no, that was just the soft scrollback code I was thinking of, which
Right. That was commit 973c096f6a85 and it was about vgacon, not fbcon.
No, fbcon had some bug too, although I've paged out the details. See commit 50145474f6ef ("fbcon: remove soft scrollback code").
Yes, but those bugs didn't affected
If I remember correctly (and it's entirely possible that I don't), the whole "softback_lines" logic had serious problems with resizing the console (or maybe changing the font size).
Right. I'm not asking to revert any soft scrollback functions.
It's about if you allow to use the fbdev-drivers hardware acceleration to move parts of the screen or if you are stuck to software memcpy() and repainting instead. None of the bug reports touched that part.
There may have been some other bad interaction with foreground/background consoles too, I forget.
I think that is independend if you use hardware acceleration or not.
Helge