On 27.04.2014 02:48, Christian König wrote: > Hi everyone, > > today I noticed that with X server 1.15.1 and current xf86-video-ati > master that page flipping won't work any more after I switched the mode > using xrandr. It looks like Ilija Hadzic already stumbled over the same > issue back in 2012 but didn't reported it upstream (at least I couldn't > find any reference to it): > https://github.com/ihadzic/vcrtcm-doc/blob/master/patches/X_1_12/0001-xf86-crtc-HACK-do-not-touch-DPMS-in-xf86DisableUnuse.patch > > > Basic problem is that xrandr calls xf86DisableUnusedFunctions while > switching the mode which in turn calls the DPMS off function which is > then never turned on again. This results in both page flipping getting > disabled and vblank handling not working any more. > > Attached is a workaround for xf86-video-ati which just turn DPMS on > again when the mode set happens, but I'm pretty sure that this isn't the > right solution to the problem. > > Ideas?
Someone on the xorg-devel mailing list might have one, adding to Cc. > From 18b745f0ea94c3f7048d11ef5b86b652019c9fed Mon Sep 17 00:00:00 2001 > From: =?UTF-8?q?Christian=20K=C3=B6nig?= <[email protected]> > Date: Sat, 26 Apr 2014 19:39:46 +0200 > Subject: [PATCH] workaround for xrandr turning DPMS off, but never on again > MIME-Version: 1.0 > Content-Type: text/plain; charset=UTF-8 > Content-Transfer-Encoding: 8bit > > Signed-off-by: Christian König <[email protected]> > --- > src/drmmode_display.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/src/drmmode_display.c b/src/drmmode_display.c > index fc99128..a0a1ea1 100644 > --- a/src/drmmode_display.c > +++ b/src/drmmode_display.c > @@ -457,6 +457,9 @@ drmmode_set_mode_major(xf86CrtcPtr crtc, DisplayModePtr > mode, > uint32_t tiling_flags = 0; > int height; > > + /* workaround for xrandr turning DPMS off, but never on again */ > + drmmode_crtc_dpms(crtc, DPMSModeOn); > + > if (info->allowColorTiling) { > if (info->ChipFamily >= CHIP_FAMILY_R600) > tiling_flags |= RADEON_TILING_MICRO; > -- 1.9.1 -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer _______________________________________________ xorg-driver-ati mailing list [email protected] http://lists.x.org/mailman/listinfo/xorg-driver-ati
