linux-kernel - Re: linux-next: Tree for Aug 13 [ screen corruption in graphical mode ]

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CA+icZUXdVhuMm4izOTUxgjNuPmbii2uk+LE76HVYaUrEwmEbOg@mail.gmail.com>
Date:	Tue, 13 Aug 2013 22:52:42 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>,
	Sedat Dilek <sedat.dilek@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next <linux-next@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Dave Airlie <airlied@...il.com>,
	DRI <dri-devel@...ts.freedesktop.org>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>
Subject: Re: linux-next: Tree for Aug 13 [ screen corruption in graphical mode ]

On Tue, Aug 13, 2013 at 10:33 PM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> On Tue, Aug 13, 2013 at 10:25 PM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>> On Tue, Aug 13, 2013 at 10:20 PM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
>>> On Tue, Aug 13, 2013 at 10:16:10PM +0200, Sedat Dilek wrote:
>>>> On Tue, Aug 13, 2013 at 10:10 PM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
>>>> > On Tue, Aug 13, 2013 at 09:05:41PM +0200, Sedat Dilek wrote:
>>>> >> On Tue, Aug 13, 2013 at 8:53 PM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
>>>> >> > On Tue, Aug 13, 2013 at 08:40:37PM +0200, Sedat Dilek wrote:
>>>> >> >> On Tue, Aug 13, 2013 at 8:01 PM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
>>>> >> >> > On Tue, Aug 13, 2013 at 07:53:25PM +0200, Sedat Dilek wrote:
>>>> >> >> >> Files attached.
>>>> >> >> >
>>>> >> >> > Can you also please attach a full dmesg so I can check for anything
>>>> >> >> > unusual?
>>>> >> >> >
>>>> >> >
>>>> >> > Nothing scarred me on a couple of read throughs.
>>>> >> >
>>>> >> > What happens if you try:
>>>> >> >
>>>> >> > diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
>>>> >> > index 112c5e1..9828d9b 100644
>>>> >> > --- a/drivers/gpu/drm/i915/i915_gem_stolen.c
>>>> >> > +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
>>>> >> > @@ -284,7 +284,7 @@ i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
>>>> >> >                 return NULL;
>>>> >> >
>>>> >> >         ret = drm_mm_insert_node(&dev_priv->mm.stolen, stolen, size,
>>>> >> > -                                4096, DRM_MM_SEARCH_DEFAULT);
>>>> >> > +                                1024*1024, DRM_MM_SEARCH_DEFAULT);
>>>> >> >         if (ret) {
>>>> >> >                 kfree(stolen);
>>>> >> >                 return NULL;
>>>> >> >
>>>> >> > --
>>>> >>
>>>> >> Now, 2/3 till 3/4 of my LightDM greeter screen is a black bar (seen
>>>> >> from the top).
>>>> >> On the bottom I can read "Ubuntu 12.04 LTS" with the known background.
>>>> >> So-to-say 3/4 "blind".
>>>> >
>>>> > That implies that the scanout is always reading from the base of stolen.
>>>> > Can you grab intel_reg_dumper so that I can check what values the
>>>> > transcoder is set to?
>>>> >
>>>> > At the moment, I am guessing that the display never sees the updated
>>>> > surface offset and so persists with the value programmed by the BIOS -
>>>> > which will be 0 and set to the base of stolen memory in the GTT. A
>>>> > drm.debug=6 dmesg would help here as well.
>>>> >
>>>> > If you forced a mode change, I think that too would restore the output.
>>>>
>>>> With which kernel? Vanilla next-20130813? With any of your patches?
>>>
>>> Any but the working one ;-)
>>
>> Damn Gmail, they switched again the UI, f***.
>>
>> This is d-i-n with Revert "drm/i915: Allocate LLC ringbuffers from
>> stolen" <--- "working one" (no screen corruptions).
>>
>> - Sedat -
>
> Vanilla next-20130813 after 1st login and logout-unity2d-plus-relogin-lightdm.
> The diff might be interesting as the 2nd login makes the issue go away.
>

intel_reg_dumper output attached.

- Sedat -

View attachment "intel_reg_dumper_3.11.0-rc5-next20130813-1-iniza-small.txt" of type "text/plain" (14943 bytes)