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