[rescue] 1920x1080 on LCD with a TGX+ :-) (was: Re: FB resolution in PROM)
Maciej W. Rozycki
macro at linux-mips.org
Sat Feb 27 19:23:12 CST 2016
On Sat, 27 Feb 2016, Andrew Jones wrote:
> > I didn't get all that I wanted - the LCDs won't sync properly to many
> > signals, and only display partial resolutions of others (such as 1920x1200
> > displayed as 1600x1200 by a SyncMaster T260). Perhaps the LCDs aren't
> > comfortable with the composite sync.
> This may not be a sign that your settings are wrong.
> I've been having this problem with an 'ifb' device. 1920x1200 is supposedly a
> supported resolution, but my only ostensibly-compatible monitor detects it as
> 4:3, and squashes everything.
Assuming that you're using analogue video signalling maybe all you need
to do is going into the monitor's advanced settings menu (if it has one;
you might need to reach for a service manual) and adjusting the resolution
recognised manually? Perhaps it's picking the wrong one, from a set of
predefined settings? What resolution does the monitor report when you hit
the wrong rendering?
I had this issue with an LCD panel incorrectly recognising the text mode
I'm used to, which is 80x37 characters or 720x592 pixels. As you can
imagine this was "approximated" as the somewhat more common 800x600 SVGA
So I had to go into the advanced settings menu, only available by keeping
one of the monitor's control buttons depressed while powering the device
on and not documented with the enclosed hardcopy manual. There I could
set the horizontal and vertical pixel counts as required individually, and
once they have been both adjusted, to 720 and 592 respectively, the issue
This panel is happy with sync-on-green BTW and supports monochrome input
too, i.e. it shows shades of grey rather than green. Configuring the
monochrome mode is also only available via the advanced menu though (sync
is automatic of course). I haven't tried composite sync however as I have
no suitable graphics device available. The manual claims it's supported.
More information about the rescue