Bug 18554 - Red flicker with radeon driver (Radeon 9000 Pro AGP) and DVI on PowerMac G4
Summary: Red flicker with radeon driver (Radeon 9000 Pro AGP) and DVI on PowerMac G4
Status: NEW
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/Radeon (show other bugs)
Version: 7.4 (2008.09)
Hardware: PowerPC Linux (All)
: medium normal
Assignee: xf86-video-ati maintainers
QA Contact: Xorg Project Team
Depends on:
Reported: 2008-11-16 13:25 UTC by linuxuser330250
Modified: 2008-11-17 11:24 UTC (History)
0 users

See Also:
i915 platform:
i915 features:

xorg.conf (9.65 KB, text/plain)
2008-11-16 13:25 UTC, linuxuser330250
no flags Details
Xorg.0.log (70.36 KB, text/plain)
2008-11-16 13:39 UTC, linuxuser330250
no flags Details

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Description linuxuser330250 2008-11-16 13:25:31 UTC
Created attachment 20340 [details]

The hardware:
Apple Power Mac G4 MDD (PowerMac3,6) - see http://support.apple.com/kb/SP63 - mine is the Dual 1 GHz model.

The software:
Gentoo Linux 2008.0 (started about 1 year ago with 2007.1)
Kernel 2.6.27 (started with 2.6.22)
X.org 7.4 (started with 7.2)
radeon driver: x11-drivers/xf86-video-ati-6.9.0 (started with 6.7.197, 6.8.0)

When there was no problem:
The Radeon 9000 Pro AGP 4x has a DVI output connector and an ADC (Apple Display Connector). It originally shipped with a DVI-to-VGA adaptor.
The output was okay with this DVI-to-VGA adaptor and a CRT monitor.

I then bought a TFT monitor -
I connected it directly via DVI.
I wasn't able to get a screen upon initialization without red flicker since.

*) red flickering after first X initialization.
*) red flickering is gone when changing the screen resoltion.
e.g. "xrandr -s 1280x1024" and then "xrandr -s 1680x1050" (panel resolution) fixes the red flickering; same with Ctrl-Alt-+ and Crtl-Alt--
*) I today discovered that setting Option "ReducedBlanking" in 
the /etc/X11/xorg.conf Monitor Section resolved the red flickering on first 
*) the red flickering _always_ reappears after console switching (when 
returning to the X console).

Others with the same problem:
davidgurvich: http://forums.gentoo.org/viewtopic-p-5282763.html
Giuliano: http://lists.freedesktop.org/archives/xorg/2007-January/020641.html
Comment 1 linuxuser330250 2008-11-16 13:39:40 UTC
Created attachment 20341 [details]
Comment 2 linuxuser330250 2008-11-17 10:08:35 UTC
Correction to the previous statement:

Option "ReducedBlanking" doesn't change anything. I had forgotten that I had put the lines "xrandr -s 1280x1024 ; xrandr -s 1680x1050" into my /usr/kde/3.5/share/config/kdm/Xsetup which then (quite quickly) changed resoultion and thus removed the red flickering from the screen.
Sorry for the false statement.

BTW, Giuliano told me that the older radeon driver 6.3.3 works on ppc with DVI, so I will try that one as the next step.

Comment 3 linuxuser330250 2008-11-17 11:24:02 UTC
Okay, it was off course x11-drivers/xf86-video-ati-6.6.3 (not 6.3.3). But anyway, it fails compilation right at the start with x11-base/xorg-server-1.5.2 (X.org 7.4) due to changed structs in atibus.c, atichip.c, and some more...

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