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SubjectRe: fbcon scrolling madness + fbset corruption
No one's commented on this yet.

James?

On Sun, Feb 02, 2003 at 07:57:44PM +0000, Russell King wrote:
> This doesn't appear to solve the ywrap problem - I still get
> places where the screen doesn't scroll. I decided to write a
> small program to dump out the contents of fb_var_screeninfo, and
> where stuff goes horribly wrong:
> bash-2.04# ./tst
> Visible: 1280x1024
> Virtual: 1280x1632
> BPP : 8
> Offset : +0+2352
> bash-2.04# ./tst
> Visible: 1280x1024
> Virtual: 1280x1632
> BPP : 8
> Offset : +0+2392
>
> Up to the point where it goes wrong:
>
> bash-2.04# ./tst
> Visible: 1280x1024
> Virtual: 1280x1632
> BPP : 8
> Offset : +0+528
> bash-2.04# ./tst
> Visible: 1280x1024
> Virtual: 1280x1632
> BPP : 8
> Offset : +0+568
> bash-2.04# ./tst
> Visible: 1280x1024 <--- this is the last line on the screen
> Virtual: 1280x1632
> BPP : 8
> Offset : +0+608
> bash-2.04#
>
> So it looks like something isn't limiting the yoffset in the generic
> console layer; an xoffset of 2392 when the maximum virtual Y is 1632
> is just nonsense.
>
> I also noticed an additional problem with fbcon: if I change the
> resolution using fbset, the change occurs, except I end up with
> corrupted mess on the screen (the reminents of the original display.)
> The shell prompt is nowhere to be seen.
>
> Hitting ^L clears the screen and then the shell prompt is visiable.

--
Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux
http://www.arm.linux.org.uk/personal/aboutme.html

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