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Fresh install of 12.04.1 LTS x86-64, Sapphire Flex HD6950 video card.

  • I initally booted with one display connected, added the other four, and they all worked (cloned)
  • I can set them to "Multi-display desktop" and get five independent displays, but each has its own Unity bars. (I eventually want to merge four of these into a single work area treated as one display)
  • In pursuit of Xinerama, I set them to "Single Display Desktop (Multi-desktop)", which requires a restart. During the subsequent boot, X fails to start.

Interesting bit from the end of /var/log/Xorg.0.log :

[    14.517] (II) fglrx(4): [uki] DRM interface version 1.0
[    14.517] (II) fglrx(4): [uki] created "fglrx" driver at busid "PCI:1:0:0"
[    14.517] (II) fglrx(4): [uki] added 8192 byte SAREA at 0x2000
[    14.517] (II) fglrx(4): [uki] mapped SAREA 0x2000 to 0x7fb706a97000
[    14.518] (II) fglrx(4): [uki] framebuffer handle = 0x3000
[    14.518] (II) fglrx(4): [uki] added 1 reserved context for kernel
[    14.518] (II) fglrx(4): swlDriScreenInit done
[    14.518] (EE) fglrx(4): Not enough video memory to allocate primary surface (frame buffer).
[    14.518] (II) fglrx(4): Shutdown CMMQS
[    14.518] (II) fglrx(4): [uki] removed 1 reserved context for kernel
[    14.518] (II) fglrx(4): [uki] unmapping 8192 bytes of SAREA 0x2000 at 0x7fb706a97000
[    14.518] (WW) fglrx(4): ***********************************************************
[    14.518] (WW) fglrx(4): * DRI initialization failed                               *

This line in particular drew my attention: fglrx(4): Not enough video memory to allocate primary surface (frame buffer). The card has two gigabytes of memory.

I'm using latest stable driver from AMD (12.8), built .debs with this guide: What is the correct way to install ATI Catalyst Video Drivers?

Somebody else that has had this error worked around it with the "nopat" kernel param; I tried that and it didn't help ( https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/1004546 )

I also messed with ServerLayout in xorg.conf a bit, wondering if 9600 horizontal pixels was too much:

Section "ServerLayout"
        Identifier     "aticonfig Layout"
        Screen      0  "aticonfig-Screen[0]-0" 0 0
        Screen         "amdcccle-Screen[1]-1" 1920 0
        Screen         "amdcccle-Screen[1]-2" 3840 0
        Screen         "amdcccle-Screen[1]-3" 5760 0
        # my failure occurs with either of these lines:
        Screen         "amdcccle-Screen[1]-4" 5760 1200
        # Screen         "amdcccle-Screen[1]-4" 7680 0
EndSection

Update: 3840 Limit?

When I use the Ubuntu Displays configurator instead of AMD's thing, it seems to tell me that there's a hard limit of 3840x3840 for the entire virtual desktop:

requested position/size for CRTC 149 is outside the allowed limit: position=(3840,3840), size=(1920, 1200), maximum=(3840,3840)

Googling around, I see others encountering the same error with a variety of maximum limits - how is this number derived? How might I increase it?

As a workaround for now I can rearrange the screens on this dialog to fit inside the 3840x3840 square, but that doesn't reflect the physical layout of my displays.

I don't have enough rep yet on this stack exchange site to embed an image, but here's the dialog with the 3840 limit: http://i.stack.imgur.com/CKAld.png

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To me, 5 displays connected to one card seems a bit too much. Maybe try to connect those monitors using low resolution first. Does it work that way? –  Misery Sep 26 '12 at 6:25
    
It works under Windows, and is a selling point of this card! (They call it "Eyefinity") I don't actually have five displays; I have two - one fairly standard 1920x1200, and one ridiculous 3840x2400 monster that acts as if it were four displays, using four single-link DVI cables. (IBM T221). I'm unable to test with lower resolutions because the display won't take them. –  jrr Sep 26 '12 at 15:05

1 Answer 1

up vote 1 down vote accepted

I contacted AMD support, and I'm happy to report the "Not enough video memory to allocate primary surface (frame buffer)" issue is fixed as of Catalyst 12.11.

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