Mailinglist Archive: opensuse-bugs (4068 mails)

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[Bug 628039] radeon: display goes blank on modeswitch, video outputs switched off(?)

https://bugzilla.novell.com/show_bug.cgi?id=628039

https://bugzilla.novell.com/show_bug.cgi?id=628039#c3


Achim Gratz <Stromeko@xxxxxxxx> changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|NEEDINFO |NEW
InfoProvider|Stromeko@xxxxxxxx |

--- Comment #3 from Achim Gratz <Stromeko@xxxxxxxx> 2011-08-31 21:13:48 UTC ---
Thank you for asking. I've since switched to Tumbleweed and it is still an
issue even with the latest kernel and driver.

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 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.

If there's anything I can do to help fix this problem, let me know.

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