Hello!

I am running KDE from Kubuntu PPA beta (Maverick) repositories, so version 4.6 beta2, and I am having trouble with generation of thumbnails in plasma. For example, when I place the mouse pointer over an app in task manager, no thumbnail is generated:


Same thing happens when I use CTRL+TAB to get task list, or when I place my mouse pointer at top left corner of the screen to view all currently running apps - no thumbnail/preview.

Any idea why this is happening? Is it because I have missed some program that needs to be installed?

Unfortunately your image link is broken. Can you please repost it?

Which graphics card + driver do you have?

Is this working?
<a href="http://s388.photobucket.com/albums/oo329/cubancigar11/?action=view&amp;current=snapshot1-3.png" target="_blank"><img src="http://i388.photobucket.com/albums/oo329/cubancigar11/snapshot1-3.png" border="0" alt="Photobucket"></a>

I have a ThinkPad T60p.

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$ lspci
00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03)
00:01.0 PCI bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express PCI Express Root Port (rev 03)
00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 1 (rev 02)
00:1c.1 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 2 (rev 02)
00:1c.2 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 3 (rev 02)
00:1c.3 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 4 (rev 02)
00:1d.0 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #3 (rev 02)
00:1d.3 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #4 (rev 02)
00:1d.7 USB Controller: Intel Corporation N10/ICH 7 Family USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02)
00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7 Family) SATA IDE Controller (rev 02)
00:1f.3 SMBus: Intel Corporation N10/ICH 7 Family SMBus Controller (rev 02)
01:00.0 VGA compatible controller: ATI Technologies Inc M56GL [Mobility FireGL V5200]
02:00.0 Ethernet controller: Intel Corporation 82573L Gigabit Ethernet Controller
03:00.0 Ethernet controller: Atheros Communications Inc. AR5212 802.11abg NIC (rev 01)
15:00.0 CardBus bridge: Texas Instruments PCI1510 PC card Cardbus Controller


I don't think this is a problem with Graphics driver etc., since it all works fine with stock stable KDE 4.5

Unfortunately not...

If the thumbnail is just plain missing (not an empty space there), then try opening System Settings > Desktop Effects > All Effects. Make sure "Taskbar Thumbnails" is checked.

I too have this issue. When i move mouse over task bar then just for fraction of second thumbnail is visible there after it disappears. I am using Kde 4.6 on kubuntu 10.10.

I also had too many crashes when i enabled default kwin effects. It reduced drastically when i disabled many effects.

Any help is appreciated.

any help?

if you log in as a new user does and enable thumbnails does it work?

google01103 wrote: you log in as a new user does and enable thumbnails does it work?

I have only one user account and that too auto login mode. Also Thumbnail is enabled. I will create new user account and post the result in the next post.

bcooksley wrote:Unfortunately not...

If the thumbnail is just plain missing (not an empty space there), then try opening System Settings > Desktop Effects > All Effects. Make sure "Taskbar Thumbnails" is checked.

I can see his screenshot. There is a space for the thumbnail but it's blank if that helps.

This is likely a bug in either KWin or their graphics driver in this case.

Here is my output of lspci command. However i dont suspect video card as defaulter because the same distro with kde 4.5 worked flawlessly.

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sundar@sundar-BONEFISH:~$ lspci
00:00.0 Host bridge: ATI Technologies Inc Device 5a31 (rev 01)
00:01.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge
00:12.0 IDE interface: ATI Technologies Inc IXP SB400 Serial ATA Controller (rev 80)
00:13.0 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller (rev 80)
00:13.1 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller (rev 80)
00:13.2 USB Controller: ATI Technologies Inc IXP SB400 USB2 Host Controller (rev 80)
00:14.0 SMBus: ATI Technologies Inc IXP SB400 SMBus Controller (rev 82)
00:14.1 IDE interface: ATI Technologies Inc IXP SB400 IDE Controller (rev 80)
00:14.2 Audio device: ATI Technologies Inc IXP SB4x0 High Definition Audio Controller (rev 01)
00:14.3 ISA bridge: ATI Technologies Inc IXP SB400 PCI-ISA Bridge (rev 80)
00:14.4 PCI bridge: ATI Technologies Inc IXP SB400 PCI-PCI Bridge (rev 80)
01:05.0 VGA compatible controller: ATI Technologies Inc RC410 [Radeon Xpress 200M]
09:02.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
sundar@sundar-BONEFISH:~$


Your system has an ATi graphics card. Please ensure you are using the correct driver for your card, it is up to date, all KDE packages are up to date, and that the appropriate Desktop Effects are enabled.

Otherwise, there isn't anything further you can do unfortunately. Your card may require some xorg.conf parameters to work well under KDE, some googling should determine what these are.

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Your system has an ATi graphics card. Please ensure you are using the correct driver for your card, it is up to date, all KDE packages are up to date, and that the appropriate Desktop Effects are enabled.

I have installed correct driver for my graphics card. All kde packages are up to date and appropriate desktop effects are ennabled.

May be i have to wait till next bug fix release to make it work properly