cyblafb in kernel 2.6.16: corrupted display in Xfree86

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

Hi!

The cyblafb driver workes fine for me up to Linux kernel 2.6.15.6,
but with 2.6.16 I get the following problem:

After booting the system, the framebuffer console comes up fine, but
when xdm starts up the X server, I get this diplay:
http://ftp.intevation.de/users/thomas/cyblafb/cyblafb-1.jpg

After switching to the console with Ctrl-Alt-F1 and back to X:
http://ftp.intevation.de/users/thomas/cyblafb/cyblafb-2.jpg

When I use Ctrl-Alt-Backspace to restart xdm everything looks fine:
http://ftp.intevation.de/users/thomas/cyblafb/cyblafb-3.jpg

I use Debian sarge on a Lex Light (CV860A board):
0000:01:00.0 VGA compatible controller: Trident Microsystems CyberBlade/i1 (rev 6a) (prog-if 00 [VGA])
        Subsystem: Trident Microsystems CyberBlade/i1
        Flags: bus master, 66MHz, medium devsel, latency 32, IRQ 5
        Memory at e4000000 (32-bit, non-prefetchable) [size=8M]
        Memory at e5000000 (32-bit, non-prefetchable) [size=128K]
        Memory at e4800000 (32-bit, non-prefetchable) [size=8M]
        Expansion ROM at 10000000 [disabled] [size=64K]
        Capabilities: <available only to root>


Resolution 1152x864 pixels (16 bpp) with fbdev driver in XF86Config-4.

/etc/fb.modes:
mode "1152x864-70"
    # D: 100.0 MHz, H: 66.138 kHz, V: 69.99 Hz
    geometry 1152 864 1152 864 8
    timings 10000 168 40 57 13 152 11
    hsync high
    vsync high
endmode

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
(because the cyblafb driver doesn't understand mode=1152x864 as parameter)

XFree86 is standard Debian sarge: 4.3.0.dfsg.1-14sarge1

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?

Any idea what's happening here?

Regards,
Thomas

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


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