Re: ghosting with nvidia framebuffer (pci-e 6600), 1600x1200 and 12x22 font

["Antonino A. Daplas" <adaplas@gmail.com>]

On Friday 22 July 2005 14:35, Jurriaan Kalkman wrote:
> > On Thursday 07 July 2005 03:04, jurriaan wrote:
> >> 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.

Ah, okay, if it disappears and then reappears on scrolling, then yes, it is
probably not a timings problem.  Forget about adjusting the video timings,
but let me know if switching resolutions work.

Try setting vyres = yres and see if that helps. It's either a panning
problem or a bitblit problem.

Tony



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