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

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

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...

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>