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SubjectRe: Radeon KMS doesn't work.
Justin P. Mattock wrote:
> On 07/05/2010 10:27 AM, Marvin wrote:
> >
> >Hi Wakko,
> >
> >as nobody seems to have answered yet, I think it's better that you file a
> >bug
> >against the radeon driver (bugs.freedesktop.org, one bug for each defect).
> >There may be similar bugs already, so please check this also.
> >
> >Thanks
> >
> >Marvin
> >
> >Am Montag 05 Juli 2010, 01:19:26 schrieb Wakko Warner:
> >>Wakko Warner wrote:
> >>>I have a Dell Inspiron 5100 with an ATI Radeon Mobility M7 (7500 R100
> >>>PCI ID 1002:4c57 sub 1028:0149).
> >>>
> >>>Immediately when radeon.ko is loaded, the screen goes blank (The
> >>>backlight stays on). I have fbcon compiled into the kernel (I also
> >>>tried as module). I am unable to get the screen to work again until I
> >>>reboot. The logs did not appear to have any errors after the module
> >>>loaded. The system was still responsive on the network.
> >>>
> >>>I tried kernels 2.6.33 and 2.6.34.
> >>>
> >>>I can provide kernel output if needed.
> >>
> >>I need to add that if I use modeset=0, the screen does not blank.
> >>
> >>Also 2.6.34 (with modeset=0) doesn't do 3D very well on this system. Some
> >>objects look ok, some are garbled, some do not appear at all. The gears
> >>from xscreensaver does not show up at all.
> >
> >--
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> >Please read the FAQ at http://www.tux.org/lkml/
> >
>
>
> I've hit a couple of things with radeon as well.. the first was this:
> http://lkml.org/lkml/2010/6/6/172
> (if your hitting this issue, then the patch should work and/or it should
> already be in the main tree).

Doesn't appear to be. I mentioned above that I have no errors. I forgot
about it saying something about the BIOS. It shows this
[drm:radeon_get_bios] *ERROR* Unable to locate a BIOS ROM

> then a few days ago hit another:
> https://bugzilla.kernel.org/show_bug.cgi?id=16335
> (keep in mind still uncertain on a fix for this, reverting the commit
> gets me up and running(I created a patch, but an umsure if it's a right
> solution)).

This one appears to be X related. In my case, this happens immediately at
radeon.ko load (with modeset=1).
Verification of this was booting with init=/bin/sh and modprobe radeon.
Instant black screen. The backlight stays on.

> if none of these are what your hitting, then maybe(if you can) do a
> bisect on this!

I tried 2.6.32.15. I noticed that KMS was in staging. This one didn't do a
black screen. I saw mostly white, green and a pinkish color. All were kind
of washed out and were in vertical lines. KMS on this laptop has not worked
with stock kernels.

I booted Ubuntu 10.04 live CD and it appears that KMS was working. I don't
know what patches they have in the kernel for this or what is different.

--
Microsoft has beaten Volkswagen's world record. Volkswagen only created 22
million bugs.


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