[Bug 28238] VSync to secondary monitor over VGA using GL fails (succeeds with xv, however)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28238

--- Comment #5 from meneerjansen00 at gmail.com 2010-08-07 10:19:12 PDT ---
[CODE]
do_wait: drmWaitVBlank returned -1, IRQs don't seem to be working correctly.
Try adjusting the vblank_mode configuration parameter.
[/CODE]
I experience the same thing (on S-video out and VGA crt monitor). Searched the
internet for the term "vblank_mode". Error existed even when dinosaurs walked
the earth. The term seems not to be 'invented' by mplayer but by GL.

Anyway installed the program 'driconf' to get a .drirc file in ~. Adjusted the
parameter vblank_mode from 1 to 0 as suggested on the 'net. Did not help (of
course). Some rumors about this error finally solved in kernel 2.6.33 which is
not yet available for my package manager. Probably only solved for the newer
Ati/AMD cards.

Further data:
Ubuntu 10.04.
Ati Radeon 9600 w/ Xorg open 'Radeon' driver.
mplayer -vo gl = error and sluggish playback, if any. mplayer -vo xv = fine.  
NO kms of course.
No 3D desktop effects (compostite).
kernel 2.6.32
TV out acchieved by:
[code]
xrandr --output S-video --set load_detection 1
xrandr --output S-video --mode 800x600
xrandr --output S-video --primary
xrandr --output S-video --set tv_horizontal_size 2
xrandr --output S-video --set tv_horizontal_position -5
xrandr --output S-video --set tv_vertical_position -3
xrandr --output VGA-0 --off
[/code]

Would like to know what is the matter: faulty implementation of GL by Radeon
driver or hardware problem?

(In reply to comment #4)
> I'm not using KMS.

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