Hi!
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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
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Any ideas?
Alex probably knows more about this, but it sounds like problems with
switching the memory clocks on 3D load.
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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