Created attachment 103797 [details]
I get a GPU HANG while using Chrome with Kubuntu 14.04 64 bit and a vanilla 3.15 kernel.
The system works fine for some time, then some black squares will appear in chrome, and then there is the GPU hang.
$ lspci -nn
00:00.0 Host bridge : Intel Corporation 2nd Generation Core Processor Family DRAM Controller [8086:0104] (rev 09)
00:02.0 VGA compatible controller : Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09)
00:16.0 Communication controller : Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 [8086:1e3a] (rev 04)
00:1a.0 USB controller [0c03]: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 [8086:1e2d] (rev 04)
00:1b.0 Audio device : Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller [8086:1e20] (rev 04)
00:1c.0 PCI bridge : Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1 [8086:1e10] (rev c4)
00:1c.2 PCI bridge : Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 3 [8086:1e14] (rev c4)
00:1c.3 PCI bridge : Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 4 [8086:1e16] (rev c4)
00:1d.0 USB controller [0c03]: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 [8086:1e26] (rev 04)
00:1f.0 ISA bridge : Intel Corporation HM75 Express Chipset LPC Controller [8086:1e5d] (rev 04)
00:1f.2 SATA controller : Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode] [8086:1e03] (rev 04)
00:1f.3 SMBus [0c05]: Intel Corporation 7 Series/C210 Series Chipset Family SMBus Controller [8086:1e22] (rev 04)
01:00.0 Ethernet controller : Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 07)
02:00.0 Network controller : Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter [168c:0036] (rev 01)
03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5229 PCI Express Card Reader [10ec:5229] (rev 01)
[ 23.177] (II) Loading /usr/lib/xorg/modules/drivers/intel_drv.so
[ 23.224] (II) Module intel: vendor="X.Org Foundation"
[ 23.224] compiled for 1.15.0, module version = 2.99.910
Created attachment 103798 [details]
screen corruption screenshot
Created attachment 103799 [details]
The black squares are a symptom of the same bug - the hang occurs when those black pixels overwrite the batchbuffer instead of the render buffer.
If I can provide more information let me know.
It works fine with Ubuntu 3.13.0-32 kernel
What version of Mesa are you using? Stock Kubuntu 14.04 appears to ship Mesa 10.1.0, and we had a fix for a related issue in 10.1.1 or 10.2.0.
I'm using mesa 10.1.3
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