When changing video timing dynamically via fbset the screen sporadically is rendered black.
With the attached fix which disables VCO prior to timing register change the problem disappears. I had a look at the Xserver register setup code. Here the VCO is disabled in the same way [1]. This patch is taken from vga-sync-field version 0.0.11 [2][3]. [1] http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/tree/src/i830_driver.c [2] http://lowbyte.de/vga-sync-fields/vga-sync-fields-0.0.11.tgz [3] http://git.hellersdorfer-jugendchor.de/?p=vga2scart.git;a=commitdiff;h=dcc3b863e5a663652587619c357bd20075af6896 Signed-off-by: Thomas Hilber <spar...@lowbyte.de> Signed-off-by: Paul Menzel <paulepan...@users.sourceforge.net> CC: Dave Airlie <airl...@gmail.com> --- drivers/video/intelfb/intelfbdrv.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/drivers/video/intelfb/intelfbdrv.c b/drivers/video/intelfb/intelfbdrv.c index 6d8e541..7ba8db5 100644 --- a/drivers/video/intelfb/intelfbdrv.c +++ b/drivers/video/intelfb/intelfbdrv.c @@ -1364,6 +1364,11 @@ static int intelfb_set_par(struct fb_info *info) DBG_MSG("intelfb_set_par (%dx%d-%d)\n", info->var.xres, info->var.yres, info->var.bits_per_pixel); + /* + * Disable VCO prior to timing register change. + */ + OUTREG(DPLL_A, INREG(DPLL_A) & ~DPLL_VCO_ENABLE); + intelfb_blank(FB_BLANK_POWERDOWN, info); if (ACCEL(dinfo, info)) -- 1.6.2.4
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