Bug 62773

Created attachment 77069 [details]
Backtrace from Xorg

AFAIR, xrandr doesn't support multiple GPUs.
I haven't read #57200 though, tl;dr.

From curiosity, I tried doing it on my 2x nouveau setup. It crashes exactly the same.

My suggestion: try 2x ATI card. Then we will see if it's nouveau problem or xorg/xrandr/whatever.

This happens directly after trying to enable the screen:

mar 29 21:17:07 nwkr-desktop kernel: nouveau  [     DRM] 0xC585: Parsing digital output script table
mar 29 21:17:07 nwkr-desktop kdm[26677]: X server for display :0 terminated unexpectedly


Interesting fact: a monitor on the second GPU contains some random pixels. So something really happens there. ;-) Things crossed to get xrandr with multiple GPUs!

Created attachment 80342 [details]
full backtrace

Thinkpad T420 Reverse Optimus. When I activate the monitor at my digital output, X crashes if Optimus is fully aktivated in the bios/efi. If i have activated only the dedicated graphics card all works fine. I am using X server 1.14.1

$ xrandr                              
Screen 0: minimum 320 x 200, current 1600 x 900, maximum 32767 x 32767
LVDS1 connected primary 1600x900+0+0 (normal left inverted right x axis y axis) 309mm x 174mm
   1600x900       60.0*+   40.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
VGA1 disconnected (normal left inverted right x axis y axis)
$ xrandr --setprovideroutputsource 1 0     
$ xrandr                              
Screen 0: minimum 320 x 200, current 1600 x 900, maximum 32767 x 32767
LVDS1 connected primary 1600x900+0+0 (normal left inverted right x axis y axis) 309mm x 174mm
   1600x900       60.0*+   40.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
VGA1 disconnected (normal left inverted right x axis y axis)
LVDS-2 disconnected (normal left inverted right x axis y axis)
VGA-2 disconnected (normal left inverted right x axis y axis)
DP-1 connected (normal left inverted right x axis y axis)
   1920x1080      59.9 +   60.0  
   1680x1050      59.9  
   1280x1024      75.0     60.0  
   1280x960       60.0  
   1152x864       75.0  
   1024x768       75.1     60.0  
   832x624        74.6  
   800x600        75.0     60.3     56.2  
   640x480        75.0     60.0  
   720x400        70.1  
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
  1024x768 (0x69)   65.0MHz
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock   48.4KHz
        v: height  768 start  771 end  777 total  806           clock   60.0Hz
  800x600 (0x6c)   40.0MHz
        h: width   800 start  840 end  968 total 1056 skew    0 clock   37.9KHz
        v: height  600 start  601 end  605 total  628           clock   60.3Hz
  800x600 (0x6d)   36.0MHz
        h: width   800 start  824 end  896 total 1024 skew    0 clock   35.2KHz
        v: height  600 start  601 end  603 total  625           clock   56.2Hz
$

Created attachment 84010 [details]
Xorg.0.log - two radeons

I see the same crash after the same sequence of commands as the original reporter, with two Radeons driven by open-source radeon driver. Same thing also happens with any combination of AMD/NVidia cards, and with two NVidia cards (all opensource drivers), so my guess would be the bug is in Xorg

lspci output:
dl:/data/obs/openSUSE:Factory # lspci | grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Cedar PRO [Radeon HD 5450/6350]
04:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV620 LE [Radeon HD 3450]

Xorg.0.log is attached

this is with Xorg 1.14.2 and xf86-video-ati 7.2.0, kernel 3.9.0 from openSUSE

Created attachment 84011 [details]
two radeons - gdb backtrace

further debugging reveals that the crash happens because in whatever gets extracted from [Something]PixmapPriv, pScreen is 0. (in my case, this is pScreen attached to the damaged region)

I am now trying to track down whose responsibility it is to set this value. As far as I can guess, this should be created when the X server starts, as part of CreateRootWindow, perhaps?

I could use a little help from someone who understands this stuff ;e) thanks

can you try with an X server from the X.org 1.14 branch?

I think there are a lot of fixes not in 1.14.2 for reverse optimus. or try a Fedora 19 distro, since upstreaming this stuff is slow.

server-1.14-branch code fixes this for me

I'm getting a segfault when I try to rotate the display. Enabling it is fine however.

Created attachment 90754 [details]
Xorg.1.log - rotation segfault

I'm getting a segfault when I try to rotate the display. Enabling it is fine however.

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