[mythtv-users] strange 1920x540 with nvidia

Marco Nelissen marcone at xs4all.nl
Tue Feb 20 02:12:13 UTC 2007


>The problem is that when I select the 1920x1080 mode I get only a
>'virtual' screen of 1920x1080 (the nvidia driver calls this the
>'backend' resolution).  I get a visible screen (frontend) of 1920x540.
>Everything is chopped off in the middle (video playback is chopped in
>the middle, the mythtv frontend is chopped in the middle, etc...).
>This is with the 9xxx nvidia drivers.  

I have the same problem with the latest drivers and a Sharp Aquos LCD.
After noticing in Xorg.0.log that the resolution it picked had a 120Hz
refresh rate, and further finding that the driver seemed to completely
ignore any refresh rate limits I put in xorg.conf, I ended up modifying
mythtv locally to reject any refresh rate that was significantly larger
than standard TV refresh rates.
There were other symptoms as well:
- even though the main menu runs in 1920x1080i, first viewing of a 1080i
  recording results in the image being "squished" vertically. I have to
  play a 720p show first, after which 1080i will work.
- after watching a 720p recording, the screen won't switch back to 1080i.
  I mapped a button on my remote to run the appropriate xrandr command
  to switch back to 1080i (a workaround which strangely does not work with
  problem #1)
For whatever reason I can't get the 8xxx drivers to work anymore, so I'm
stuck with the 9xxx driver, but I'd advise anyone who has a 8xxx driver
working to just stick with it, and not upgrade to any 9xxx driver.
(though I'm sure someone will chime in to say that 9xxx works just dandy
for them)




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