Flashing Graphic interface

[Christophe]

Hi,
My new kubuntu 15.10 seem to work pretty nice on my lenovoG50-30 laptop however when I minimize windows the graphic layout

have tendence to flah / twinkle.

Here the lspci :

00:00.0 Host bridge: Intel Corporation Atom Processor Z36xxx/Z37xxx Series SoC Transaction Register (rev 0e)
00:02.0 VGA compatible controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display (rev 0e)
00:13.0 SATA controller: Intel Corporation Atom Processor E3800 Series SATA AHCI Controller (rev 0e)
00:14.0 USB controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series USB xHCI (rev 0e)
00:1a.0 Encryption controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Trusted Execution Engine (rev 0e)
00:1b.0 Audio device: Intel Corporation Atom Processor Z36xxx/Z37xxx Series High Definition Audio Controller (rev 0e)
00:1c.0 PCI bridge: Intel Corporation Atom Processor E3800 Series PCI Express Root Port 1 (rev 0e)
00:1c.2 PCI bridge: Intel Corporation Atom Processor E3800 Series PCI Express Root Port 3 (rev 0e)
00:1c.3 PCI bridge: Intel Corporation Atom Processor E3800 Series PCI Express Root Port 4 (rev 0e)
00:1f.0 ISA bridge: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Power Control Unit (rev 0e)
00:1f.3 SMBus: Intel Corporation Atom Processor E3800 Series SMBus Controller (rev 0e)
02:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10)

Let's say that I can live with this inconvenient but little help to resolve this little problem will be welcomed .

[Simon]

A friend of mine had some flicker on start up where the screen is supposed to do the slow fade in from black. System Settings --> Desktop Effects --> Unchecked all boxes in the Tab "All Effects"

Flicker stopped. Later she downloaded drivers with System --> Additional Drivers this seemed to help.

EDIT: Also I notice your GPU is an ATOM which is Nvidia? If so to get full GPU support you need the Nvidia drivers from "Additional Drivers" but I see Intel oh well still worth a shot.

[Feathers McGraw]

I have an Intel Haswell processor with intrgrated graphics. Can't remember the exact model number at the moment, but it's different to yours.

Anyway, I get a similar effect when minimising and moving windows - sometimes they flash/"stutter", parts of the screen don't update properly etc. Pretty sure it's a software problem (specifically the graphics driver). I've been hoping it will get fixed in newer kernels, but I'll have a go at turning off some desktop effects to see if that helps too.

[Christophe]

Thank's , yes that's works . By default "Rendenring backend" in " Display and Monitor setting " was set on OpenGL 2.0 , I changed it to OpenGl 3.1 and everything seem to work now.

[Feathers McGraw]

Woop! That worked for me too

I wonder why the default is 2.0, maybe that's a stable version?

At first I thought it might be a setting left over from when I first installed Kubuntu (this laptop has been upgraded about 4 times so far) but it seems like yours is a fresh installation, so probably not!

I love this forum, I learn so many useful/interesting things here