can't boot with kms with my x700 rv410 radeon

[Dennis New]

On Thu, 2 May 2013 21:29:36 -0400, Dennis New wrote:
> I'm currently running 3.9.0, and the bootup process hangs/locks my
> machine before the init stage is reached, unless I specify
> radeon.modeset=0. But modesetting /does/ work if I load the radeon
> module with modeset=1 after the kernel loads. So what could be going
> wrong during the kernel loading?
> 
> The last things printed on the screen are either
>   radeon 0000:01:00.0: radeon: using MSI.
> or
>   [drm] Driver supports precise vblank timestamp query.
>   (if I disable msi)
> 
> I think the next thing that /should/ get printed is:
>   [drm] radeon: irq initialized. (?)
> 
> Here's what dmesg says when I reload the radeon module with KMS:
>   http://dennisn.dyndns.org/guest/pubstuff/dmesg-radeon-kms-module.log

As Александр (Alex M) pointed out a few months ago on The Internet,
undoing this patch fixes this bug!

  2099810f903caa1920f3ef6014fb7f36e4786490
  drm/radeon: enable pci bus mastering after card is initialised (v2)

  https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=2099810f903caa1920f3ef6014fb7f36e4786490


(On an unrelated note, when coming back from a suspend-to-ram with this
video card (and probably many others), I get a blank screen or random
line patterns, but I am able to fix things with radeontool,
specifically with:
  radeontool light off
  radeonreg regset 0x00000284 0x1bd34208
  radeonreg regset 0x000002d0 0x003c00a1
  radeonreg regset CL:03 0x001c0007
  radeonreg regset CL:04 0x0002004a
  radeonreg regset CL:05 0x0002004a
  radeonreg regset CL:06 0x0002004a
  radeontool light on
Is this supposed to be something that userland is meant to handle?)