[Intel-gfx] Sluggish performance after resume//Re: Bug Report - [Acer Aspire V5-122P] Unable to adjust screen brightness

[Aaron Lu]

On 06/11/2014 06:54 AM, Ben Widawsky wrote:
> On Tue, Jun 10, 2014 at 08:59:32PM +0100, Lewis Toohey wrote:
>> On 10 June 2014 17:58, Ben Widawsky <ben at bwidawsk.net> wrote:
>>> On Tue, Jun 10, 2014 at 01:33:51PM +0800, Aaron Lu wrote:
>>>> +Ben Widawsky & Daniel Vetter
>>>>
>>>> On 06/09/2014 03:38 PM, Lewis Toohey wrote:
>>>>>
>>>>> Hi Aaron
>>>>>
>>>>> Firstly, yes the sluggish performance I was referring to is
>>>>> experienced in the GUI environment. Jerky graphics and CPU fan appears
>>>>> to max out and stay there. Old kernels (e.g. the Ubuntu default
>>>>> kernel) do not do this and just restore perfectly.
>>>>>
>>>>> I have completed the bisect as requested. Please find the full log
>>>>> below. I am slightly unconvinced, as building the previous commit in
>>>>> the log still seems to have the same problem, however, that commit is
>>>>> a "merge" and I don't really know what this means.
>>>>>
>>>>> Many thanks
>>>>>
>>>>> Bisect Log:
>>>>> git bisect start
>>>>> # good: [455c6fdbd219161bd09b1165f11699d6d73de11c] Linux 3.14
>>>>> git bisect good 455c6fdbd219161bd09b1165f11699d6d73de11c
>>>>> # bad: [c9eaa447e77efe77b7fa4c953bd62de8297fd6c5] Linux 3.15-rc1
>>>>> git bisect bad c9eaa447e77efe77b7fa4c953bd62de8297fd6c5
>>>>> # good: [cd6362befe4cc7bf589a5236d2a780af2d47bcc9] Merge
>>>>> git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
>>>>> git bisect good cd6362befe4cc7bf589a5236d2a780af2d47bcc9
>>>>> # good: [d2b150d0647e055d7a71b1c33140280550b27dd6] Merge tag 'sh-3.15'
>>>>> of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
>>>>> git bisect good d2b150d0647e055d7a71b1c33140280550b27dd6
>>>>> # good: [5fb6b953bb7aa86a9c8ea760934982cedc45c52b]
>>>>> include/linux/syscalls.h: add sys_renameat2() prototype
>>>>> git bisect good 5fb6b953bb7aa86a9c8ea760934982cedc45c52b
>>>>> # bad: [ffddc5fd19b219f557fd4a81168ce8784a4faced] fs/ncpfs/dir.c: fix
>>>>> indenting in ncp_lookup()
>>>>> git bisect bad ffddc5fd19b219f557fd4a81168ce8784a4faced
>>>>> # bad: [978c6050165bba52eab7ef3581d447eb215def77] Merge branch
>>>>> 'drm-docs' of ssh://people.freedesktop.org/~danvet/drm into drm-next
>>>>> git bisect bad 978c6050165bba52eab7ef3581d447eb215def77
>>>>> # bad: [262de1453184f65e5ccfe45790f93d41f7339d49] drm/i915: Directly
>>>>> return the vma from bind_to_vm
>>>>> git bisect bad 262de1453184f65e5ccfe45790f93d41f7339d49
>>>>> # bad: [031994ee8dedfa69d3a7caa43e93f3c282bc38f9] drm/i915: Implement
>>>>> WaIncreaseL3CreditsForVLVB0:vlv
>>>>> git bisect bad 031994ee8dedfa69d3a7caa43e93f3c282bc38f9
>>>>> # bad: [f72d21eddfa900bfa2674195dcc0203e18d0cc62] drm/i915: Place the
>>>>> Global GTT VM first in the list of VM
>>>>> git bisect bad f72d21eddfa900bfa2674195dcc0203e18d0cc62
>>>>> # bad: [d6660add648d10e7e35085d8c7d2653e0f9f61b7] drm/i915: Generalize
>>>>> PPGTT init
>>>>> git bisect bad d6660add648d10e7e35085d8c7d2653e0f9f61b7
>>>>> # bad: [b731d33d05dd5ce6b387cbadb0d9d24cb3732b40] drm/i915: relax
>>>>> context alignment
>>>>> git bisect bad b731d33d05dd5ce6b387cbadb0d9d24cb3732b40
>>>>> # bad: [a7b910789f77afa40ae0816d22339e9d25723c6e] drm/i915: Add vm to
>>>>> error BO capture
>>>>> git bisect bad a7b910789f77afa40ae0816d22339e9d25723c6e
>>>>> # bad: [6e164c3382314a1f63526fa7a4322a17318d0e32] drm/i915: Allow ggtt
>>>>> lookups to not WARN
>>>>> git bisect bad 6e164c3382314a1f63526fa7a4322a17318d0e32
>>>>> # bad: [6f425321e02a1b6c5e90b70f8fab7c140fcaeefb] drm/i915: Don't
>>>>> unconditionally try to deref aliasing ppgtt
>>>>> git bisect bad 6f425321e02a1b6c5e90b70f8fab7c140fcaeefb
>>>>> # bad: [e178f7057b81c87a7ceaae0ca204487b6f7eedcf] drm/i915: Provide
>>>>> PDP updates via MMIO
>>>>> git bisect bad e178f7057b81c87a7ceaae0ca204487b6f7eedcf
>>>>> # first bad commit: [e178f7057b81c87a7ceaae0ca204487b6f7eedcf]
>>>>> drm/i915: Provide PDP updates via MMIO
>>>>>
>>>>
>>>> The commit looks like related, I've added the commit author.
>>>>
>>>> Ben,
>>>> Do you have any suggestions? Does the above commit have any chance of
>>>> causing sluggish performance problem after a resume?
>>>
>>> What this comment actually does is use MMIO writes for the page tables
>>> after a GPU hang/reset. (What a poorly named commit message).
>>>
>>> Can you please provide the full dmesg with the drm.debug=0x2?
>>>
>>
>> Hi Ben
>>
>> Thank you for responding.
>>
>> Just to verify that I have done this correctly, I added
>> "drm.debug=0x2" to the kernel command line (in Grub), booted,
>> suspended and resumed, and then ran Dmesg.
>>
>> I wasn't sure exactly where to put it, so please find a copy of the output here:
>> http://www.toohey.co.uk/dmesg
>>
>> I hope that is helpful. If you need any further information please let me know.
>>
>> Many thanks
> 
> I only see radeon stuff in that dmesg. But you did the right thing to
> grub.

Oh yes, this is a AMD graphics card so the bisected commit can't
be the culprit.

No ideas now, Lewis, I'm afraid you will need try harder to find the bad
commit.

Thanks,
Aaron