Bug 21199

Summary:

Dual Head doesn't work with xorg 1.6 (One screen blank or Clone)

Product:

xorg

Reporter:

Eric Lacher <eric>

Component:

Driver/Radeon

Assignee:

xf86-video-ati maintainers <xorg-driver-ati>

Status:

RESOLVED FIXED

QA Contact:

Xorg Project Team <xorg-team>

Severity:

normal

Priority:

medium

Version:

7.4 (2008.09)

Hardware:

x86 (IA32)

OS:

Linux (All)

Whiteboard:

i915 platform:

i915 features:

Attachments:

Description	Flags
xorg log after reboot. Last lines might be there because of switching to console (CTRL-ALT-F1)	none
xorg.conf for DUAL HEAD (worked with xorg 1.5)	none
xrandr output.	none
KDE display settings, showing two screens in one. (look at the 1 and 0 in red circle)	none

Description Eric Lacher 2009-04-15 06:01:37 UTC

Created attachment 24820 [details] [review]
xorg log after reboot. Last lines might be there because of switching to console (CTRL-ALT-F1)

(xserver 7.4, radeon 6.12.2, kernel 2.6.29)

After upgrading to xorg 1.6 (xserver 7.4) my dual head configuration stopped working.
After reboot, only one of my two screens is working (not at 
default mode 1280x1024@85 but 1280x1024@60). The other one stays blank (powersave)
xrandr tells me both screens were connected and set to 1280x1024. 
Manually trying "xrandr --output DVI-0 --left-of DVI-1" or vice versa
switches screens, so the other one gets blanked.
In KDE, running Display Settings, there are two screens shown, but
pressing "identify screens" shows both, DVI-0 AND DVI-1 on the working
screen. Also the image (in KDE Settings) only shows one screen with DVI-0 
and DVI-1 written in it.
After some time, when both screens go in powersave mode, waking them makes 
both work, but in clone mode.

Comment 1 Eric Lacher 2009-04-15 06:02:58 UTC

Created attachment 24821 [details]
xorg.conf for DUAL HEAD (worked with xorg 1.5)

Comment 2 Eric Lacher 2009-04-15 06:05:05 UTC

Created attachment 24822 [details]
xrandr output.

contrary to this output, one screen is blanked (powersave mode)

Comment 3 Eric Lacher 2009-04-15 06:10:21 UTC

Created attachment 24823 [details]
KDE display settings, showing two screens in one. (look at the 1 and 0 in red circle)

Comment 4 Alex Deucher 2009-04-15 07:35:52 UTC

Does reverting commit f8c7d6a6162196a743f6885ecaf63ba50de1722a help?  If not any chance you could use git bisect to find the problematic commit?

Comment 5 Alex Deucher 2009-04-15 08:31:07 UTC

Does:
xset dpms force off

followed by moving the mouse fix up dualhead?

Comment 6 Eric Lacher 2009-04-15 08:45:18 UTC

yes, that fixed it.

Comment 7 Alex Deucher 2009-04-16 07:44:47 UTC

reverting that commit indeed seems to fix the problem.
eea9800890b56bac9c07b7bd9c9e33fae2938af3

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