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Date:   Sun, 6 Nov 2016 17:25:15 +0200
From:   Mihai Donțu <mihai.dontu@...il.com>
To:     Martin Steigerwald <martin@...htvoll.de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Intel Gfx Mailing List <intel-gfx@...edesktop.org>
Subject: Re: [REGRESSION] Linux 4.9-rc4: gfx glitches on Intel Sandybridge
 (was: Re: Linux 4.9-rc4)

On Sun, 06 Nov 2016 15:48:36 +0100 Martin Steigerwald wrote:
> Hi.
> 
> Am Samstag, 5. November 2016, 16:46:33 CET schrieb Linus Torvalds:
> > So it's once again a Saturday afternoon rather than Sunday, this time
> > because I felt this rc was already big enough.  
> 
> With kernel 4.9-rc4 I saw gfx corruptions like
> 
> https://martin-steigerwald.de/tmp/display-issues-with-kernel-4.9-rc4.png
> 
> in Konversation, Konsole, Akregator and other KDE/Qt related apps up to the 
> point of not being able to use these applications in a meaningful way.
> 
> I first thought this might be due to upgrading Qt from 5.6.1 to 5.7.1, yet 
> after rebooting into 4.8 Linux kernel as packaged in Debian I saw no gfx 
> glitches like that anymore.
> 
> Anything known about this?

https://bugzilla.kernel.org/show_bug.cgi?id=177701

The proposed patch appears to be:
https://patchwork.freedesktop.org/patch/116808/

Have not tested it yet.

> Machine is ThinkPad T520 with Sandybridge graphics.
> 
> Kernel compiled with Debian distro GCC 6 but using no-pie makefile patch.
> 
> Next week and weekend will be pretty busy and this is a production machine, so 
> bisection or any other time-consuming work on this is out of question for me. 
> I can provide additional details in case they are easy and quick enough to 
> obtain.
> 
> 
> System information (now back on 4.8 kernel):
> 
> # phoronix-test-suite system-info
> 
> Phoronix Test Suite v5.2.1
> System Information
> 
> Hardware:
> Processor: Intel Core i5-2520M @ 3.20GHz (4 Cores), Motherboard: LENOVO 
> 42433WG, Chipset: Intel 2nd Generation Core Family DRAM, Memory: 16384MB, 
> Disk: 300GB INTEL SSDSA2CW30 + 480GB Crucial_CT480M50, Graphics: Intel 2nd 
> Generation Core Family IGP, Audio: Conexant CX20590, Monitor: P24T-7 LED, 
> Network: Intel 82579LM Gigabit Connection + Intel Centrino Advanced-N 6205
> 
> Software:
> OS: Debian unstable, Kernel: 4.8.0-1-amd64 (x86_64), Desktop: KDE Frameworks 
> 5, Display Server: X Server 1.18.4, Display Driver: modesetting 1.18.4, 
> OpenGL: 3.3 Mesa 12.0.3, Compiler: GCC 6.2.0 20161103, File-System: btrfs, 
> Screen Resolution: 3840x1080
> 
> 
> # apt-show-versions | egrep "(^libgl1-mesa-dri|^libdrm-intel1|xserver-xorg-
> core)" | grep amd64
> libdrm-intel1:amd64/sid 2.4.71-1 uptodate
> libgl1-mesa-dri:amd64/sid 12.0.3-3 uptodate
> xserver-xorg-core:amd64/sid 2:1.18.4-2 uptodate
> 
> 
> Excerpt of glxinfo:
> 
> Extended renderer info (GLX_MESA_query_renderer):
>     Vendor: Intel Open Source Technology Center (0x8086)
>     Device: Mesa DRI Intel(R) Sandybridge Mobile  (0x126)
>     Version: 12.0.3
>     Accelerated: yes
>     Video memory: 1536MB
>     Unified memory: yes
>     Preferred profile: core (0x1)
>     Max core profile version: 3.3
>     Max compat profile version: 3.0
>     Max GLES1 profile version: 1.1
>     Max GLES[23] profile version: 3.0
> 
> X.org runs with modesetting driver (default was changed in Debian Sid a while 
> back).

-- 
Mihai Donțu

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