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? 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
