Re: [Dri-devel] Fealing ought the Merged FB.

[Alex D. <ag...@ya...>]

--- Mike Mestnik <che...@ya...> wrote:
> 
> --- Alex Deucher <ag...@ya...> wrote:
> > 
> > --- Mike Mestnik <che...@ya...> wrote:
> > >   The screen size(in pixels or mm) is now x1 + x2 by (y1 > y2) *
> y1 +
> > > (y1 < y2) * y2.  Swap (y and
> > > x) and (1 and 2) where needed.  Then the DPI should be calculated
> > > using the largest or the default
> > > metamode.
> > > 
> > > This is what I see.
> > > (**) RADEON(0): MergedFB: Display dimensions: (330, 240) mm
> > > (**) RADEON(0): MergedFB: DPI set to (255, 152)
> > > 
> > > ?255? Oviously wrong!
> > > 
> > 
> > Xfree86 doesn't really have a way of setting different DPI values
> for
> > each head in a single logical screen scenario like xinerama or
> > mergedfb.  what xinerama does is kind of take an average of DPI
> values
> > from each head.  mergedfb works similarly.  it tries to get the
> values
> > from DDC and barring that, it attempts to calculate a sane base. 
> it
> > works in most instances.  however if you are not getting the value
> you
> > want, you can specify it as an option
> > option "MergedDPI" "100,100"
> > for example...
> > 
> Sounds good.
> 
> > You can see how it gets calulated in radeon_mergedfb.c:
> > RADEONMergedFBSetDpi().  if you find anything that looks off let me
> > know, however I haven't had any problems with it and I don't see
> > anything off hand that looks off.
> > 
> I'm a bit curious myself, it must have forgot to devide when getting
> the average.
> 
> My Work.
> The total display is 1920x1440 and 26x9.44 inches, so I get (73, 153)
> DPI.
> (147, 152) + (107, 111) / (2, 2) = (127, 131)
> 

hmmm... i'll take a look at the code.  also as I recall you specified a
display size in your monitor section.  if you do that will be used for
calculation.

> > > 2:
> > >   I just can't get 256x240 and 1400x1050 to 1656x1050, it skips
> it
> > > and uses the next one 1024x768
> > > and 1024x768 to 1024x768 (Clone).  I have no idea what is going
> on
> > > here, nothing is left ought of
> > > the log.  I have set pll->min_pll_freq = 3000 and that got it
> working
> > > for xineramia.
> > > 
> > 
> > If you want to use a special 256x240 mode (256x240@120d for
> example)
> > then you need to specify that mode name in your metamodes and the
> modes
> > sub-section of your screen config as well as defining the modeline.
> eg:
> > 	SubSection "Display"
> > 		Depth		16
> > 		Virtual		3320 1440
> > 		Modes		
> > 				"1920x1440"
> > 		#		"1856x1392"
> > 		#		"1792x1344"
> > 				"1600x1200"
> > 				"1400x1050"
> > 				"1280x1024"
> > 		#		"1280x960"
> > 		#		"1152x864"
> > 				"1024x768"
> > 				"800x600" "640x480"
> > 				"320x240"
> > 				"256x240@120d"
> > 				^^^^^^^^^^  add this!
> > this is because the metamodes draw from the modes listed in the
> screen
> > section of your config.
> > 
> I missed that, do you have to put the mode here regardles of what
> head you would like to use it
> on?

Yes.  

> 
> > also you may have to specify a different crtc2 hsync/vrefresh range
> for
> > your custom modes since it seems to be too high for your mode:
> > (II) RADEON(0): Not using mode "256x240@60d" (vrefresh out of
> range)
> > 
> That is also odd, I use that mode in xineramia.  I recently stoped
> using it and I just use 120Hz
> one.  I'l let you know what I find.
> 

Sounds good.

Alex



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