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

Bjorn Helgaas bhelgaas at google.com
Tue Sep 24 10:53:17 PDT 2013

[+cc Dave]

On Mon, Sep 23, 2013 at 12:33 PM, Bjorn Helgaas <bhelgaas at google.com> wrote:
> [+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".

I don't see any obvious PCI issue there, so I reassigned the bugzilla
to the video folks.


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