[Bug 94171] New: ati multihead black on one output

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=94171

            Bug ID: 94171
           Summary: ati multihead black on one output
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.16, 3.19, 4.0rc1
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: mrmazda at earthlink.net
        Regression: Yes

Created attachment 168641
  --> https://bugzilla.kernel.org/attachment.cgi?id=168641&action=edit
dmesg using cedar and 3.19.0 with drm.debug=0x0E on cmdline

ATI mailing list
http://lists.x.org/archives/xorg-driver-ati/2015-February/027079.html response
suggested I file this and that bug 91861 might be related, so I used that bug
as a guide to choosing input fields here. I'm just a user/tester who does not
build. http://marc.info/?l=linux-ide&m=142517892627960&w=2 explains that
booting test machine to openSUSE 13.2 3.16.7, openSUSE Tumbleweed 3.19.0 and
Rawhide 4.0.0.rc1 is currently somewhat painful due to long boot delay.

Cut and paste from mailing list:

[paste]
Whether starting X including this:
xrandr --dpi 144 --output DVI-0 --mode 1920x1080 --above VGA-0 --output VGA-0
--primary --mode 1920x1440 # ati dual

works or not depends on which Radeon gfxcard used, and how new the software.

The cards' info:
http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/hwinfo-gfx-rv380fan.txt X600
http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/hwinfo-gfx-rv516.txt X1300
http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/hwinfo-gfx-cedarPC-big41.txt

rv380 works as expected regardless at least as far back as openSUSE 13.1 k3.12.
openSUSE Tumbleweed 3.19.0:
http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/xorg.0.log-under1440xover1080-rv380fan-OK

cedar works as expected as recently as Mageia 4 k3.12 and openSUSE 13.1 k3.12:
http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/xorg.0.log-under1440over1080-os131-cedarOK
http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/xorg.0.log-under1440-over1080-mag4-cedarOK

Failures in the form of black screen on only one output using rv516 and cedar
in the following:
Fedora 20 k3.17.7 cedar (black VGA):
http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/xorg.0.log-under1440bad-over1080OK-f20-cedar
openSUSE 13.2 k3.16.7 cedar (black VGA):
http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/xorg.0.log-under1440bad-over1080OK-os132-cedar
Fedora 21 cedar (black VGA):
http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/xorg.0.log-under1440bad-over1080OK-cedarF21-k3177
http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/xorg.0.log-under1440bad-over1080OK-cedarF21-k3187
openSUSE Tumbleweed k3.19.0 rv516 (black DVI):
http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/xorg.0.log-under1440OKxover1080bad-rv516
openSUSE Tumbleweed k3.19.0 cedar (black VGA):
http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/xorg.0.log-under1440bad-over1080OK-cedar

All of above pertains to same system, with only changes made being:

1-which OS booted
2-which ATI gfxcard installed

With necessary xrandr output descriptors for Intel, results are as expected
using onboard Intel gfx instead of ATI PCIe cards.

On cedar in Tumbleweed at least, dropping analog output mode from 1920x1440 to
1600x1200 produces expected output. 
[/paste]

Dropping analog output mode from 1920x1440 to 1600x1200 on rv516 in Tumbleweed
3.19.0 does not help. With rv516, Rawhide 4.0.0rc1.gt2.1 produces boot tty1
oopses instead of booting if both video cables are connected, boots normally
with only VGA cable connected, and locks up after 32 seconds with only DVI
cable connected.

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