On Thursday 07 July 2005 03:04, jurriaan wrote:

quoted

Kernel command line: root=/dev/hda1 video=nvidiafb:1600x1200-32@85
atkbd.softrepeat=1

nvidiafb: nVidia device/chipset 10DE0141
nvidiafb: PCI device 10de:0141 (nVidia Corporation)
nvidiafb: CRTC0 found
nvidiafb: CRTC1 found
nvidiafb: CRTC 0 appears to have a CRT attached
nvidiafb: Using CRT on CRTC 0
nvidiafb: MTRR set to ON
Console: switching to colour frame buffer device 133x54
nvidiafb: PCI nVidia NV14 framebuffer (64MB @ 0xC0000000)

I'm running at 1600x1200 resolution with the 12x22 font, and a
2.6.13-rc1-mm1 kernel.

A strange effect is noticeable: often characters from the left of the
screen are ghosted on the right of the screen. Not all of the pixels
that form a character, but enough to be visible. To my best knowledge,
the ghosting starts at column 85, and 85 * 12 = 1020, which may mean
some sort of erroneous wrap-around at pixel 1024 is taking place?

It looks like a timings problem.  Are the effects still present if you try
to change modes?

I'll try that later tonight, when I'm home again.
However, whatever corruption is on screen, when I switch virtual consoles
from tty1 to 2 and back (alt-f2 alt-f1), it disappears completely. Until I
force the screen to scroll up by pressing return at the last line, then
they reappear again.

If it was a timings problem, I wouldn't expect switching virtual consoles
to remedy it, nor scrolling the screen up to reproduce it.

Based on the dmesg snippet, I don't think the driver was able to grab the
edid.  Which means that the mode 1600x1200 was taken from the default
modedb which may not be correct for your hardware.

It's an Eizo F931 monitor, capable of running 1800x1440@85 without any
trouble in X.org (where no corruption at all is evident, BTW). The monitor
is connected through a Vista Rose KVM switch. IIRC, x.org did manage to
get EDID info, I'll also post that log.

If you can, grab X's modeline using xvidtune, then convert it into a fb
compatible modeline, enter it in /etc/fb.modes then use fbset to change
your
video mode.

I'll try that and get back to you, but I'm not convinced it's timing. I
seem to remember disabling all acceleration also fixed the corruption. I
will also test that.

Todo:

1) change modes
2) x.org log wrt. EDID
3) noaccell
4) different fontsize

Thanks,
Jurriaan



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