[This is https://bugzilla.novell.com/show_bug.cgi?id=628039 - posted here on advice of Greg Kroah-Hartman]
The full history can be checked via the above link, here's my latest findings: Linux 3.0.3-42-pae #1 SMP Thu Aug 25 02:17:07 UTC 2011 (026eef6) i686 athlon i386 GNU/Linux It has gotten better with the newer kernels/drivers, but all manifestations of the problem persist: 1) blank screen on DVI output after power-save or mode-switching a) mostly with the monitor still indicating a signal b) sometimes with the monitor saying "no signal, going to sleep" c) very seldomly switching between a) and b) at roughly 20 second intervals 2) sporadic 1..2s of screen going blank in the middle of things My current workaround is to set a very short (3min) DPMS power-off limit, since the DPMS related problems I was experiencing in the beginning seem to be resolved. If I let that limit expire and then re-activate the monitor it will most of the time work again. If I'm in more of a hurry, I connect/disconect VGA and that will usually resolve it, too (if not I can work for a while on VGA). I think that the DVI transmitter PLL is not locking correctly in all these instances (the problem seems to be slightly modulated with temperature) and that the original ATI driver either does a better job of a) checking the lock and resetting the PLL if necessary or b) using a more stable PLL switching sequence. While browsing the bugs for the radeon driver I found another way to reproduce this: If I force DPMS off, sleep ten seconds and then force it back on, the display will often stay blank. Waiting more seconds in the sequence gets it back to working order much more often. Regards, Achim. -- +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+ SD adaptation for Waldorf Blofeld V1.15B11: http://Synth.Stromeko.net/Downloads.html#WaldorfSDada _______________________________________________ xorg-driver-ati mailing list [email protected] http://lists.x.org/mailman/listinfo/xorg-driver-ati
