Re: [REGRESSION] Linux 4.9-rc4: gfx glitches on Intel Sandybridge (was: Re: Linux 4.9-rc4)

Mihai Donțu
2016-11-06T15:25:20Z

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