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Date:   Sun, 06 Nov 2016 15:48:36 +0100
From:   Martin Steigerwald <martin@...htvoll.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Intel Gfx Mailing List <intel-gfx@...edesktop.org>
Subject: [REGRESSION] Linux 4.9-rc4: gfx glitches on Intel Sandybridge (was: Re: Linux 4.9-rc4)

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?

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).

Thanks,

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