Cool! it seems to be working for me. I even got a little taste of
the Plymouth boot screen which I haven't seen in a long time :)
I'll continue testing and let you know if I experience the B[lack]SOD.

On Fri, Aug 26, 2011 at 8:19 PM, josejuan05 <email address hidden>wrote:

> I have 20 consecutive successful boots on this commit. I have no boot
> failures yet.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/727620
>
> Title:
>  [Radeon HD 5650 and 5470] Kernel BUG during recovery boot and in
>  normal boot (Hybrid graphics)
>
> Status in The Linux Kernel:
>  Confirmed
> Status in X.org XServer - ATI gfx chipset driver:
>  Confirmed
> Status in “linux” package in Ubuntu:
>  Incomplete
> Status in “xserver-xorg-video-ati” package in Ubuntu:
>  Invalid
>
> Bug description:
>  [Problem]
>  On hybrid graphics hardware with this ATI chip and another (e.g. Intel), a
> failure occurs resulting in a black screen and errors from the radeon kernel
> module, as shown below.
>
>  [Cause]
>  From upstream developer:
>
>  "The switcheroo code needs more work to switch properly on some
>  systems it seems.  There are a set acpi methods required to
>  activate/deactivate the respective gpus.  The drivers need to load and
>  initialize active hw.  If the hw is not active when the driver loads,
>  then the hw is not set up properly and it won't work.  Probably some
>  ordering issues in how the switcheroo acpi methods are called."
>
>  [Workarounds]
>  Several options:
>
>  1. If your BIOS includes functionality to disable the Intel card, use
>  BIOS settings to select which chip to load.
>
>  2. Disable KMS by adding `radeon.modeset=0` in the boot line.  Note
>  that the default radeon gallium driver only works with KMS, so YMMV.
>
>  [Original Report]
>  I'm running natty, and every since the upgrade to 6.14.0 I've been unable
> to consistently boot.  After some discussion in the forums, I tried
> repeatedly to boot into recovery mode.  In most cases, I got a black screen.
>  One time though, when I was able to successfully increase the brightness, I
> saw some errors from the radeon module.  I took a photo (available at
> http://i.imgur.com/P0bQ0.jpg), and here's the stack and call trace, as
> best as I can read it:
>
>  Stack:
>   ffff880149eb8000 ffff880149eb8000 0000000000000011 0000000000000911
>   00000000fffffff4 ffff88014b6c7800 ffff88014b0f7b58 ffffffffa022aba0
>   ffff8801460f7b58 ffff880149eb8000 0000000000000000 0000000000410028
>  Call Trace:
>   [<ffffffffa022aba0>] evergreen_cp_resume+0x3a0/0x630 [radeon]
>   [<ffffffffa022c8b7>] evergreen_startup+0x157/0x260 [radeon]
>   [<ffffffffa01fe8a0>] ? r600_pcie_gart_init+0x60/0x70 [radeon]
>   [<ffffffffa022dbec>] evergreen_init+0x1ac/0x2d0 [radeon]
>   [<ffffffffa01a5a69>] radeon_device_init+0x409/0x490 [radeon]
>   [<ffffffffa01a7142>] radeon_driver_load_kms+0xb2/0x1a0 [radeon]
>   [<ffffffffa007fb2e>] drm_get_pci_dev+0x18e/0x300 [drm]
>   [<ffffffff8115426f>] ? kmem_cache_alloc_trace+0xff/0x120
>   [<ffffffffa023790e>] radeon_pci_probe+0xb2/0xba [radeon]
>   [<ffffffff812fea7f>] local_pci_probe+0x5f/0xd0
>   [<ffffffff81300369>] pci_device_probe+0x119/0x120
>   [<ffffffff813b8eca>] ? driver_sysfs_add+0x7a/0xb0
>   [<ffffffff813b8ff8>] really_probe+0x68/0x190
>   [<ffffffff813b9305>] driver_probe_device+0x45/0x70
>   [<ffffffff813b93db>] __driver_attach+0xab/0xb0
>   [<ffffffff813b9330>] ? __driver_attach+0x0/0xb0
>   [<ffffffff813b817e>] bus_for_each_dev+0x5e/0x90
>   [<ffffffff813b8e4e>] driver_attach+0x1e/0x20
>   [<ffffffff813b89b5>] bus_add_driver+0xc5/0x280
>   [<ffffffffa0013000>] ? radeon_init+0x0/0x1000 [radeon]
>   [<ffffffff813b9676>] driver_register+0x76/0x140
>   [<ffffffffa0013000>] ? radeon_init+0x0/0x1000 [radeon]
>   [<ffffffff812ff126>] __pci_register_driver+0x56/0xd0
>   [<ffffffffa0080044>] drm_pci_init+0xe4/0xf0 [drm]
>   [<ffffffff815bf36e>] ? mutex_lock+0x1e/0x50
>   [<ffffffffa0013000>] ? radeon_init+0x0/0x1000 [radeon]
>   [<ffffffffa0077688>] drm_init+0x58/0x70 [drm]
>   [<ffffffffa00130c4>] radeon_init+0xc4/0x1000 [radeon]
>   [<ffffffff81002195>] do_one_initcall+0x45/0x190
>   [<ffffffff810a4573>] sys_init_module+0x103/0x260
>   [<ffffffff8100c002>] system_call_fastpath+0x16/0x1b
>  Code: 00 45 8b 84 24 e4 0a 00 00 45 85 c0 0f 8e c7 09 00 00 41 8b 84 24 d4
> 0a 00 00 89 c2 83 c0 01 40 c1 e2 02 49 03 94 24 c8 0a 00 00 <c7> 02 00 44 05
> c0 41 8b 94 24 e4 0a 00 00 41 23 84 24 f4 0a 00
>  RIP  [<ffffffffa0227ad7>] evergreen_cp_start+0x57/0xc80 [radeon]
>   RSP <ffff88014b0f7af8>
>  CRZ: ffffc90411ce1ffc
>  ---[ end trace 37702c56f2e23247 ]---
>  udevd-work[94]: '/sbin/modprobe -bv
> pci:v00001002d000068C1sv0000103Csd00001436bc03sc00i00' unexpected exit with
> status 0x0009
>
>  There is also some register info dumped at the top of the screen
>  visible in the photo, that I didn't bother to write, as I'd most
>  certainly get something wrong.
>
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