Linux-kernel mailing list archive 1999-32,: RE: fbcon cruft removal (continued).

# RE: fbcon cruft removal (continued).

Petr Vandrovec Ing. VTEI (VANDROVE@vc.cvut.cz)
Tue, 10 Aug 1999 19:05:13 MET-1

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On 10 Aug 99 at 18:01, Jones D (ISaCS) wrote:
> > > btw, another framebuffer problem I have found.
> > > (This may be specific to matroxfb)
> > > Boot up in a higher resolution than default,
> > > Login, and do a command that outputs quite a few lines of text
> > > (enough to make screen scroll) 'lspci -vvv' works for me.
> > > When this is done, press shift & PGUP, and some chars don't
> > > get updated and remain onscreen.
> > You have strange system... When you are pressing shift-PgUp, are there
> > penguins on the screen or are not?
> No. Once the PC has fully booted, I don't see the penguins again at all.
Then check which program removes them from screen. Maybe that program
is not compatible with the way fbcon is displaying penguins (remove
program from initscripts... and try to switch to VT2 and back to VT1 before
login. If 'lspci -vvv' & shift-pgup then works, problem is in cls()
or something like that).
> > So I think that problem is in scrollback code. Unfortunately,
> > I spent about two days with scrollback code and results was worse
> > than when I started :-(
> Would this be a generic fbcon bug, or matrox specific ?
I think that it is scrollback bug - drivers/video/fbcon.c... There are
also reentrancy bugs in it, but I tried really hard, but I was not able
to fix it. So when someone asks me that matroxfb silently dies, I recommend
to boot with video=scrollback:0 to him. It works 100%.
Petr

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