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    SubjectRe: Revert 737a3bb9416ce2a7c7a4170852473a4fcc9c67e8 ?
    On Thu, Apr 07, 2011 at 04:04:35PM +0200, Michel Dänzer wrote:
    > On Mit, 2011-04-06 at 22:43 +0200, Gabriel Paubert wrote:
    > >
    > > The probem is that, at least on one of my machines, the new driver
    > > does not work: the system hangs (apparently solid, but it's before
    > > networking starts up and I've not yet hooked up a serial console),
    > > after the "radeon: ib pool ready" message.
    >
    > Does radeon.agpmode=-1 radeon.no_wb=1 help?
    >
    > You might be able to get more information via netconsole if you prevent
    > the radeon module from loading automatically (or load it with
    > radeon.modeset=0 first) and then load it e.g. via ssh with modeset=1.

    Loading the module with modeset=1 results in insmod blocked in
    kernel state (not consuming CPU cycles either). The last kernel
    message is always the same (ib pool ready). This seems to be
    independent of agpmode and no_wb. The kernel messages when
    loading the driver are:

    kernel: [drm] radeon kernel modesetting enabled.
    kernel: checking generic (c0000000 140000) vs hw (c0000000 10000000)
    kernel: fb: conflicting fb hw usage radeondrmfb vs OFfb vga,Displa - removing generic driver
    kernel: [drm] initializing kernel modesetting (RV530 0x1002:0x71C7).
    kernel: radeon 0000:f1:00.0: Using 64-bit DMA iommu bypass
    kernel: [drm] register mmio base: 0xE8000000
    kernel: [drm] register mmio size: 65536
    kernel: radeon 0000:f1:00.0: Invalid ROM contents
    kernel: ATOM BIOS: X1650PRO
    kernel: [drm] Generation 2 PCI interface, using max accessible memory
    kernel: radeon 0000:f1:00.0: VRAM: 512M 0x0000000000000000 - 0x000000001FFFFFFF (512M used)
    kernel: radeon 0000:f1:00.0: GTT: 512M 0x0000000020000000 - 0x000000003FFFFFFF
    kernel: [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
    kernel: [drm] Driver supports precise vblank timestamp query.
    kernel: irq: irq 9 on host /mpic mapped to virtual irq 24
    kernel: u3msi: allocated virq 0x18 (hw 0x9) addr 0xf8004090
    kernel: radeon 0000:f1:00.0: radeon: using MSI.
    kernel: [drm] radeon: irq initialized.
    kernel: [drm] Detected VRAM RAM=512M, BAR=256M
    kernel: [drm] RAM width 128bits DDR
    kernel: [TTM] Zone kernel: Available graphics memory: 1002914 kiB.
    kernel: [TTM] Initializing pool allocator.
    kernel: [drm] radeon: 512M of VRAM memory ready
    kernel: [drm] radeon: 512M of GTT memory ready.
    kernel: [drm] GART: num cpu pages 131072, num gpu pages 131072
    kernel: [drm] radeon: 1 quad pipes, 2 z pipes initialized.
    kernel: [drm] PCIE GART of 512M enabled (table at 0x00040000).
    kernel: radeon 0000:f1:00.0: WB enabled
    kernel: [drm] Loading R500 Microcode
    kernel: [drm] radeon: ring at 0x0000000020001000
    kernel: [drm] ring test succeeded in 6 usecs
    kernel: [drm] radeon: ib pool ready.


    For now, with modeset=0, agpmode=-1 and no_wb=1, the driver
    seems to work. But it sometimes took hours to fail, so some
    more wait is needed.

    Regards,
    Gabriel
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