[Bug 61811] New: kms mode breaks and using radeon.agpmode=-1

[Bjorn Helgaas]

[+cc linux-pci, linux-kernel, dri-devel]

On Sat, Sep 21, 2013 at 11:39 AM,  <bugzilla-daemon at bugzilla.kernel.org> wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=61811
>
>             Bug ID: 61811
>            Summary: kms mode breaks and using radeon.agpmode=-1
>            Product: Drivers
>            Version: 2.5
>     Kernel Version: 3.12
>           Hardware: All
>                 OS: Linux
>               Tree: Fedora
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: PCI
>           Assignee: drivers_pci at kernel-bugs.osdl.org
>           Reporter: bruno at wolff.to
>         Regression: No
>
> I need to use radeon.agpmode=-1 with my rv280 based graphics card due to a long
> (2+ years) standing bug with the driver. Recently I was no longer able to start
> X because modesetting is no longer working. At boot I no longer see the
> resolution change and I got log entries later in Xor.0.log saying "[KMS] drm
> report modesetting isn't supported."
> If I boot without radeon.agpmode=-1 X starts, though becomes unusable shortly
> due to the pre-existing but. kernel-PAE-3.12.0-0.rc0.git22.2.fc21.i686 works
> for me. kernel-PAE-3.12.0-0.rc0.git24.1.fc21.i686 doesn't work. (git23's build
> failed so I didn't test that one.)
> I did a git whatchanged d5d04bb..3711d86 which I think should have showed me
> the commits that were in git24 and not git22 and I didn't see any specifically
> directed at the radeon driver. I did see some PCI related commits.

Thanks for the report!  Can you attach the complete dmesg logs from
the working kernel and the failing one (booted with
"radeon.agpmode=-1") to the bugzilla?  Also the output of "lspci -vv".

Bjorn