On Mon, Mar 14, 2011 at 6:20 PM, Alex Deucher <alexdeucher@xxxxxxxxx> wrote: > On Sun, Mar 13, 2011 at 10:08 AM, Anders Eriksson <aeriksson@xxxxxxxxxxx> wrote: >> Hi, >> >> I've found what I guess is a radeon (or drm/kms) regression post 2.6.35. >> I've got my TV conneced to my RS690G over HDMI, and the display has >> always been jittery after POST and at the GRUB screen. Pre-KMS, the X >> server (or driver got it sorted), and when KMS started, the display >> stabilized right after the kernel driver was initiated. However, post >> 2.6.35, I see the jitter is back. >> >> I've spent the last month trying to bisect it, but pretty much failed. >> It appears that versions closer to 2.6.38-rcX are more prone to display >> jitter, while 2.6.36 or so can have many successful runs. It also >> appears to be related to device power-on order, or so I've come to >> believe; A stable display can turn jittery, just by power cycling the TV. >> >> I've uploaded a video of a 38-rc8 boot: >> http://www.easy-share.com/1914220540/2.6.38-rc8_bad_x.mp4 >> >> You'll see jitter at the POST screen and GRUB. When KMS kicks in it >> stabilizes, and when Freevo starts X, it's back to jitter. > > Does plain X or gnome/kde jitter too or just freevo? Does this patch help? diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c index 1d89259..a2bd944 100644 --- a/drivers/gpu/drm/radeon/atombios_crtc.c +++ b/drivers/gpu/drm/radeon/atombios_crtc.c @@ -524,7 +524,7 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc, if ((rdev->family == CHIP_RS600) || (rdev->family == CHIP_RS690) || (rdev->family == CHIP_RS740)) - pll->flags |= (/*RADEON_PLL_USE_FRAC_FB_DIV |*/ + pll->flags |= (RADEON_PLL_USE_FRAC_FB_DIV | RADEON_PLL_PREFER_CLOSEST_LOWER); if (ASIC_IS_DCE32(rdev) && mode->clock > 200000) /* range limits??? */ > > Alex > >> >> The jitter is always of the same kind. It looks like an old tv set which >> loses sync. The contents on the display is, for a split second, placed >> at the wrong part of the screen (vertically and to some extent >> horizontally), and every 5-15 seconds or so, there is a big reset when >> the TV tries to restart things (I guess). At the resets, thee is a loud >> 'ping' in the nearby stereo too... >> >> During the bisect (and a t 38-rc8) I've seen this both at the console >> (post KMS) and in X, so I'm not sure where the error is. I hope some of >> you can get a better idea of where to hunt for the bug by looking at the >> video. >> >> -Anders >> > _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
