[mythtv] DRM VSync

Ivor Hewitt ivor at ivor.org
Fri Apr 1 15:15:09 UTC 2005


Doug Larrick wrote:
> Ivor Hewitt wrote:
> 
>># xvidtune  -show
>>"1280x1024"     0.00   1280    0    0    0   1024    0    0    0
>>
>>Hmmm, could that be the problem? The driver is using a synthetic
>>modeline which isn't fully populated?
> 
> 
> That's definitely weird.  At 0 MHz pixel clock, it should take an
> infinite amount of time to show a frame :-)  How about xrandr -- what
> does it report?
> 

Interestingly xrandr with the synthetic modelines does report refresh 
rates, albeit slightly wrong (76Hz instead of 75)

# xrandr
  SZ:    Pixels          Physical       Refresh
*0   1280 x 1024   ( 361mm x 292mm )  *76
  1   1024 x 768    ( 361mm x 292mm )   85
  2    800 x 600    ( 361mm x 292mm )   86
  3    640 x 480    ( 361mm x 292mm )   86


Would it be more accurate for mythtv to actually time the drm sync 
interval to establish the refresh rate rather than use the refresh rate 
reported by X? or does it just use that value as a guide?

-- 
Ivor
http://www.ivor.it


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