[mythtv-users] Re: Tearing and the mythical VBlank ioctl

[Doug Larrick]

William Uther wrote:
> So, I finally got around to trying this.  I'm using kernel 2.6.10 which 
> is tricky to get going with the NVidia drivers.  I managed to get nVidia 
> driver version 6629 installed with some minor patches.  When I start it 
> up I get this:
> 
>  > 2005-01-16 17:17:10 OpenGLVideoSync: GLX Video Sync extension not 
> present.
> 
> despite `glxinfo` returning:
> 
>> server glx extensions:
>>     GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_SGIX_fbconfig,
>>     GLX_SGIX_pbuffer, GLX_SGI_video_sync, GLX_SGI_swap_control
>> client glx vendor string: NVIDIA Corporation
>> client glx version string: 1.3
>> client glx extensions:
>>     GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_visual_info,
>>     GLX_EXT_visual_rating, GLX_EXT_import_context, GLX_SGI_video_sync,
>>     GLX_NV_swap_group, GLX_NV_video_out, GLX_SGIX_fbconfig, 
>> GLX_SGIX_pbuffer,
>>     GLX_SGI_swap_control, GLX_NV_float_buffer
>> GLX extensions:
>>     GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_SGIX_fbconfig,
>>     GLX_SGIX_pbuffer, GLX_SGI_video_sync, GLX_SGI_swap_control,
>>     GLX_ARB_get_proc_address

This is not normal.  If I could run 6629 and/or 2.6.10, I'd debug it.

> Which appears to include GLX_SGI_video_sync.  I assume this is what you 
> were talking about when you mentioned you "had trouble" with the latest 
> driver?

No, the trouble some are seeing is severe display corruption, which 
starts off with a seemingly-frozen nVidia logo (or black screen if you 
have that option turned off).

-Doug
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