Re: [REGRESSION] Linux 4.9-rc4: gfx glitches on Intel Sandybridge (was: Re: Linux 4.9-rc4)
From: Martin Steigerwald
Date: Sun Nov 06 2016 - 10:42:26 EST
Am Sonntag, 6. November 2016, 17:25:15 CET schrieb Mihai DonÈu:
> 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?
> The proposed patch appears to be:
> Have not tested it yet.
It applies cleanly. I think I get a chance to test it this week.
> > 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 profile version: 3.0
> > X.org runs with modesetting driver (default was changed in Debian Sid a
> > while back).