Radeon HD 5450 on PowerMac G5

Alex Deucher alexdeucher at gmail.com
Tue May 29 15:54:20 PDT 2012

On Sun, May 27, 2012 at 5:08 PM, Stephane Louise
<stephane.r.louise at gmail.com> wrote:
> Hi,
> 2012/5/1 Alex Deucher <alexdeucher at gmail.com>:
>> On Tue, May 1, 2012 at 10:25 AM, Stephane Louise
>> <stephane.r.louise at gmail.com> wrote:
>>> Which version of kernel would you suggest?
>> 3.1 or 3.3 or 3.4 maybe?  With a new enough kernel (3.4 I think), you
>> can try the hw i2c controllers rather than the bit-banging bus; just
>> load radeon with the parameter hw_i2c=1.
> For memory, the 3.1 kernel was installed before and didn't work.
> I finally compiled and installed a 3.4 kernel, and this time, it
> doesn't even detect when a new screen is plugged in.

Did you try with radeon.hw_i2c=1 or without?  You shouldn't get any
difference in behavior without that option since it uses the same code
paths as earlier kernels.

> AFAIKS, the issue with the driver so far is that it is unable to
> detect screens either because it calculate a false CRC with the
> plugged screen (kernel 3.2 behavior), or simply can't find any screen
> attached to a port (3.1 and 3.4 kernel behavior).
> Attached dmesg for the 3.4 kernel.

I dunno.  Nothing sticks out as problematic.  Others have used the
driver on ppc without problems.  Maybe Ben or Michel have some ideas.


> Best regards,
> Stéphane Louise

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