[Bug 13610] Radeon VBlanks enabled after VT switch

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=13610





------- Comment #1 from art at ified.ca  2007-12-11 18:13 PST -------
Created an attachment (id=13049)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=13049&action=view)
disabe-vblank-on-entervt

Testing on my hardware showed (Radeon Mobility M7 LW AGP) showed that enabling
vblanks is not necessary, if a dri app was open during a vt switch it will call
RADEONDRISetVBlankInterrupt when it is restored after the VT switch anyways.
Furthermore, I found that after returning to xserver, even if
RADEONDRISetVBlankInterrupt had never been called that vblanks were enabled as
radeon at pci:0000:01:00.0 was generating 60 interrupts / second. It seems that
RADEONDRISetVBlankInterrupt (pScrn, FALSE) can successfully be called in
RADEONEnterVT, disabling vblanks and saving power while not effecting dri apps
that may have been open, but of course I have no idea if this is true on other
setups.


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