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@kernel-bugs.osdl.org Reporter: mrmazda@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-rv3...
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-os13... http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/xorg.0.log-under1440-over1080-mag...
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-over1080O... openSUSE 13.2 k3.16.7 cedar (black VGA): http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/xorg.0.log-under1440bad-over1080O... Fedora 21 cedar (black VGA): http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/xorg.0.log-under1440bad-over1080O... http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/xorg.0.log-under1440bad-over1080O... openSUSE Tumbleweed k3.19.0 rv516 (black DVI): http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/xorg.0.log-under1440OKxover1080ba... openSUSE Tumbleweed k3.19.0 cedar (black VGA): http://fm.no-ip.com/Tmp/Linux/Xorg/ATIdual/xorg.0.log-under1440bad-over1080O...
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.