[Intel-gfx] Setting proper video mode

[Adam Jackson]

On 10/29/11 9:00 AM, Jarek wrote:

> Is there something beside the modeline, which my affect setting display
> mode ? How to compare what is set with iegd that the display is working,
> and how to force xf86-video-intel to do the same ?

The first thing that comes to mind is infoframe setup for HDMI.  Is this 
an HDMI display?

Also, how does the output of intel_reg_dumper compare between the two 
drivers?

> The modeline is exactly the same, except refresh rate, which in iegd is
> 61Hz, and in xf86-video-intel is 61.7 - I don't think that such small
> difference may affect the display.

If they're exactly the same then they can't really have different 
refresh rates.  Refresh rate is a derived quantity, the modeline 
actually stores the pixel clock rate.  If you were seeing different 
refresh rates in the log file then you were seeing an artifact of the 
roundoff math of the thing printing them.

On the other hand you might be reporting the refresh rate as seen on the 
LCD's on-screen display, if it has one, in which case it's a little 
weirder.  That would indicate that you really are sending different 
timings to the display, possibly because the PLL search code in iegd 
picked a different answer.  But dumping the m/n/p registers would tell you.

- ajax