Re: cyblafb in kernel 2.6.16: corrupted display in Xfree86

[Thomas Arendsen Hein <thomas@intevation.de>]

* Knut Petersen <Knut_Petersen@t-online.de> [20060323 09:44]:
> >/etc/fb.modes:
> >mode "1152x864-70"
> >   # D: 100.0 MHz, H: 66.138 kHz, V: 69.99 Hz
> >   geometry 1152 864 1152 864 8
>
> That is very slow. Use geometry 1152 864 2048 4096 8

This only works with kernel 2.6.16, not with 2.6.15.6

> >To enable this resolution I use:
> >
> >/etc/rcS.d/S42cyblafb:
> >/sbin/modprobe cyblafb bpp=16 mode=1024x768 ref=85 && /usr/sbin/fbset -a 
> >1152x864-70
> 
> /sbin/modprobe cyblafb && /usr/sbin/fbset -a 1152x864-70 should be 
> sufficient.

Yes, it is.

> >One further thing to note is that I compiled 2.6.15.6 with gcc
> >2.95.4 and 2.6.16 with gcc 3.4.3, can this make a difference?

I compiled 2.6.15.6 with gcc 3.4.3, too, just to make sure that this
makes no difference.

> I cannot test 1152x864 on my system because my monitor does not understand
> that resolution. But if it worked previously it should work now ;-)

Maybe you can test it with your monitor, too, see below.

> Are there any problems on the framebuffer console? You wrote that the fb 
> console
> comes up fine, but please confirm that scrolling is ok.

Scrolling in fbcon works perfectly, with or without xdm started.

> Are there any problems left after you reach the state of your third 
> picture?

No problems then.

> Switching between the fb console and X works flawlessly then?

Yes, no problem.

> Are there any problems if you use the standard resolutions, eg 1024x768 
> or 1280x1024?

No and yes:
Everything works fine when using
/sbin/modprobe cyblafb bpp=16 mode=1280x1024 ref=85
but I get the same problems if I do:
/sbin/modprobe cyblafb && /usr/sbin/fbset -a 1280x1024-85

> Try a fbset -vxres 2048 -vyres 4096  after your first fbset. Does that 
> change anything?

Nothing changed.

> Please send dmesg logs of kernel 2.6.15.6 and 2.6.16 after adding 
> verbosity=2
> to the modprobe of cyblafb - everything from the point of loading 
> cyblafb to your third
> picture. Also include the X server logs. Maybe it?s a good idea to send 
> those logs to my
> private address Knut_Petersen@t-online.de.

I'll do so.

Thomas

-- 
Email: thomas@intevation.de
http://intevation.de/~thomas/


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