linux-kernel - Re: 4.1-rc4 display-port on radeon not working

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Date:	Wed, 20 May 2015 18:04:13 -0400
From:	Alex Deucher <alexdeucher@...il.com>
To:	Malte Schröder <malte@...ip.de>
Cc:	Maling list - DRI developers <dri-devel@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 4.1-rc4 display-port on radeon not working

On Wed, May 20, 2015 at 12:57 PM, Malte Schröder <malte@...ip.de> wrote:
> On 05/20/15 17:37, Alex Deucher wrote:
>> On Tue, May 19, 2015 at 6:03 PM, Malte Schröder <malte@...ip.de> wrote:
>>> Hi,
>>> with 4.1-rc display-port on my Tahiti XT stopped working. I used the
>>> firmware from http://people.freedesktop.org/~agd5f/radeon_ucode/ as of
>>> today.
>>> Note: the display is an Asus PB278, it used to have problems with
>>> display port negotiation, but those disappeared like a year ago.
>>>
>>
>> Does booting with radeon.auxch=0 on the kernel command line in grub
>> help?  Can you bisect?
>>
>> Alex
>>
>
> Yes, radeon.auxch=0 helps. As for bisecting, I can try, but I won't have
> time for that until next week.

No need to bisect.  if auxch=0 helps, I know what commit broke it.
Does the attached patch help?

Alex


>
> --
> Gruß
> Malte Schröder
> ---------------------------------------------------------------------
> MalteSch@....de
>

View attachment "0001-drm-radeon-fix-error-flag-checking-in-native-aux-pat.patch" of type "text/x-patch" (1055 bytes)