Hi!
> >> >4.3-rc7 kernel, graphics works reasonably well in 1600x1200 mode. But
> >> >my monitor is native 1920x1080, so that mode looks pretty ugly on
> >> >screen. If I go to 1920x1080, I see colored horizontal lines (often
> >> >black) as soon as there's graphics activity.
> >> >
> >> >pavel@half:~$ xrandr
> >> >Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
> >> >VGA-0 connected 1920x1080+0+0 (normal left inverted right x axis y
> >> >axis) 478mm x 268mm
> >> > 1920x1080 60.00*+
> >> > 1600x1200 60.00
> >> > 1680x1050 59.95
> >> > 1280x1024 75.02 60.02
> >> > 1440x900 59.89
> >> > 1024x768 75.08 60.00
> >> > 800x600 75.00 60.32
> >> > 640x480 75.00 60.00
> >> > 720x400 70.08
> >> > pavel@half:~$ xrandr --output VGA-0 --mode 1600x1200
> >> > pavel@half:~$ xrandr --output VGA-0 --mode 1920x1080
> >> > pavel@half:~$ xrandr --output VGA-0 --mode 1600x1200
> >> >
> >> >Any ideas?
> >>
> >> Alex probably knows more about this, but it sounds like problems with
> >> switching the memory clocks on 3D load.
> >
> >> Try to disable power management completely with radeon.dpm=0 on the kernel
> >> command line or nailing the hardware at a specific power level using
> >> sysfs.
> >
> > I tried that, but it still flickers.
>
> It's probably pll stability. There seem to be a number of regressions
> since the pll code was rewritten to support matching the hdmi clocks
> more closely. Does this patch help?
>
> diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c
> b/drivers/gpu/drm/radeon/atombios_crtc.c
> index dac78ad..b86f06a 100644
> --- a/drivers/gpu/drm/radeon/atombios_crtc.c
> +++ b/drivers/gpu/drm/radeon/atombios_crtc.c
> @@ -569,6 +569,8 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
> radeon_crtc->pll_flags = 0;
>
> if (ASIC_IS_AVIVO(rdev)) {
> + radeon_crtc->pll_flags |= RADEON_PLL_PREFER_MINM_OVER_MAXP;
> +
> if ((rdev->family == CHIP_RS600) ||
> (rdev->family == CHIP_RS690) ||
> (rdev->family == CHIP_RS740))
>
Help.. maybe... it is tricky to tell. It definitely does _not_ fix the
issue completely.
> Unfortunately, it can't be applied as is because we had a similar
> patch which was reverted because it regressed a bunch of other
> systems. The actual pll limits probably need to be tweaked.
Any ideas how to tweak the pll limits?
Thanks,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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