Comment 18 for bug 115968

(In reply to comment #13)
> (In reply to comment #12)
> > (In reply to comment #11)
> > > (In reply to comment #10)
> > > > (In reply to comment #9)
> > > > > (In reply to comment #8)
> > > > > > can you try adding the 1400x1050 mode to the mode list in the display section
> > > > > > of config? e.g.,
> > > > > >
> > > > > > Modes "1400x1050" "1280x1024" "1024x768" "800x600" "640x480"
> > > > > >
> > > > > > Looks like the driver is trying to use 1280x1024.
> > > > > >
> > > > >
> > > > I mean that I want to set 1280x1024. But when I used PanelSize option, only
> > > > left upper corner of screen is displayed and LCD is blinking.
> > >
> > > Are there any modes that do work on the panel? Are you sure it's 1400x1050?
> > > The bios specifies panel timings and size for 1024x768, so we don't have timing
> > > information for 1400x1050. Without that it's guess-work get get proper panel
> > > timing which is why your get the blinking and such.
> > >
> > Only 1024x768 works correctly. I'm sure, that 1400x1050 is supported by that
> > panel, because it's SVGA+ 15 inch lcd 1.5 years old. How can I calculate proper
> > timing values for 1280x1024 resolution? I know about special calculators, but I
> > don't have any information about that LCD. Any ideas?
> >
>
> Alex, one more. Take a look at latest log. It seems,that bios provides timing
> information for 1280x1024 resolution. But these timing values don't work.
>

Where do you see that? The bios have timing info for 1024x768 only:

(II) RADEON(0): Panel ID string: 1024x768
(II) RADEON(0): Panel Size from BIOS: 1024x768
(II) RADEON(0): BIOS provided dividers will be used.

in your newer log, you force the panel size:
(**) RADEON(0): Panel size is forced to: 1400x1050

which attempts to do the right thing based on the current state of the hardware, but there is no other timing info in the bios.