Re: [Bug 112211] New: ATI Radeon Graphics not rendering correctly

[Dan Williams <dan.j.williams@intel.com>]

On Tue, Feb 9, 2016 at 12:36 PM, Dan Williams <dan.j.williams@intel.com> wrote:
> On Tue, Feb 9, 2016 at 12:20 PM, Andrew Morton
> <akpm@linux-foundation.org> wrote:
>>
>> (switched to email.  Please respond via emailed reply-to-all, not via the
>> bugzilla web interface).
>>
>> On Tue, 09 Feb 2016 08:41:39 +0000 bugzilla-daemon@bugzilla.kernel.org wrote:
>>
>>> https://bugzilla.kernel.org/show_bug.cgi?id=112211
>>>
>>>             Bug ID: 112211
>>>            Summary: ATI Radeon Graphics not rendering correctly
>>>            Product: Memory Management
>>>            Version: 2.5
>>>     Kernel Version: Linux 4.5-rc3
>>>           Hardware: IA-32
>>>                 OS: Linux
>>>               Tree: Mainline
>>>             Status: NEW
>>>           Severity: normal
>>>           Priority: P1
>>>          Component: Page Allocator
>>>           Assignee: akpm@linux-foundation.org
>>>           Reporter: smf.linux@ntlworld.com
>>>         Regression: No
>>>
>>> On testing linux 4.5-rc( 1,2 and 3) I have found that my display is not
>>> rendered correctly on starting the X server. My screen is mainly black with
>>> portions of the desktop appearing from time to time. I initially raised this
>>> with the DRM/Radeon team:
>>>
>>> https://bugs.freedesktop.org/show_bug.cgi?id=93998
>>>
>>> On investigation a bisect identified the following commit as the source of my
>>> problem:
>>>
>>> 01c8f1c44b83a0825b573e7c723b033cece37b86 is the first bad commit
>>> commit 01c8f1c44b83a0825b573e7c723b033cece37b86
>>> Author: Dan Williams <dan.j.williams@intel.com>
>>> Date:   Fri Jan 15 16:56:40 2016 -0800
>>>
>>>     mm, dax, gpu: convert vm_insert_mixed to pfn_t
>>>
>>>     Convert the raw unsigned long 'pfn' argument to pfn_t for the purpose of
>>>     evaluating the PFN_MAP and PFN_DEV flags.  When both are set it triggers
>>>     _PAGE_DEVMAP to be set in the resulting pte.
>>>
>>>     There are no functional changes to the gpu drivers as a result of this
>>>     conversion.
>>>
>>>     Signed-off-by: Dan Williams <dan.j.williams@intel.com>
>>>     Cc: Dave Hansen <dave@sr71.net>
>>>     Cc: David Airlie <airlied@linux.ie>
>>>     Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
>>>     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
>>>
>>> The problem is present on two AMD/ATI systems I have tried but is absent from
>>> my Intel based laptop. All my systems are 32 bit LFS builds.
>>>
>>> I did try to contact Dan Williams but I am not sure that my e-mail got through,
>>> can anyone suggest a way forward please ?
>>>
>>
>> Does your kernel include
>>
>> commit 03fc2da63b9a33dce784a2075c7e068bb97cbf69
>> Author: Dan Williams <dan.j.williams@intel.com>
>> Date:   Tue Jan 26 09:48:05 2016 -0800
>>
>>     mm: fix pfn_t to page conversion in vm_insert_mixed
>>
>
> Hi Stuart, from the bugzilla activity it looks like you are already
> running with this fix.  Can you append you kernel config file to the
> bugzilla.  There's something particular about 32-bit builds I'm
> missing...

Thanks for the config file.  I was able to reproduce this in a VM that
uses the DRM layer.  The fix that works for me is available here in
patchwork [1].  Let me know if it works in your environment.

[1]: https://patchwork.kernel.org/patch/8276171/

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