[mythtv-users] Aspect ratio problem due to fglrx ATI Driver ?

Jonathan Rogers jonner at teegra.net
Mon May 14 14:55:29 UTC 2007

On Mon, 2007-05-14 at 09:52 -0400, Cnudde, Paul wrote:
> You don't have to use the fglrx driver. With the radeon driver or the ati driver that is supplied by xorg, you can prevent the hard crashing of your machine by disabling DRI.  Comment out the DRI line in the modules section of your xorg.conf.
> Of course if you do that you won't have any 3D rendering (but you might not care about that).  I have a 9500 pro in my myth box and I have been regretting it.  My problem is I can't get the fglrx driver to display at 1280x768.  The ati and radeon driver will do that resolution but not 3D rendering because of the lockup/DRI issue.  Also the image quality with the ati and radeon drivers is very poor when compared with the fglrx driver.
I have a Radeon 9600 based card and I've seen the opposite: image
quality with fglrx is poor, but it's good with the radeon driver (ati is
a higher level driver that simply delegates to radeon for Radeon
hardware). I have an LCD TV connected to the card via DVI with a
painstakingly tweaked modeline for 1368x768.

My only complaint for video playback is the frame/field timing isn't
quite perfect, so there is slight jerkiness sometimes, though I usually
don't notice it. The OpenGL acceleration seems to be working somewhat,
though there are glitches; I really haven't tried it much, since I don't
need it for MythTV.
Jonathan Rogers <jonner at teegra.net>
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