Bug 174489

Version:            (using KDE 4.1.2)
OS:                Linux
Installed from:    Ubuntu Packages

My system was working OK with KDE 3.5 (Kubuntu 8.04). It is not a very powerfull system but I think it should be good enough compared to the various netbook out there.

jcd@lancelot:~$ lspci                                                           
00:00.0 Host bridge: Silicon Integrated Systems [SiS] 741/741GX/M741 Host (rev 03)                                                                              
00:01.0 PCI bridge: Silicon Integrated Systems [SiS] SiS AGP Port (virtual PCI-to-PCI bridge)                                                                   
00:02.0 ISA bridge: Silicon Integrated Systems [SiS] SiS963 [MuTIOL Media IO] (rev 25)                                                                          
00:02.1 SMBus: Silicon Integrated Systems [SiS] SiS961/2 SMBus Controller       
00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE]
00:02.7 Multimedia audio controller: Silicon Integrated Systems [SiS] AC'97 Sound Controller (rev a0)
00:03.0 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f)
00:03.1 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f)
00:03.2 USB Controller: Silicon Integrated Systems [SiS] USB 2.0 Controller
00:04.0 Ethernet controller: Silicon Integrated Systems [SiS] SiS900 PCI Fast Ethernet (rev 90)
01:00.0 VGA compatible controller: Silicon Integrated Systems [SiS] 661/741/760PCI/AGP or 662/761Gx PCIE VGA Display Adapter
jcd@lancelot:~$ cat /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 8
model name      : AMD Duron(tm)
stepping        : 1
cpu MHz         : 1804.443
cache size      : 64 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmovpat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow up
bogomips        : 3608.88
clflush size    : 32
power management: ts

jcd@lancelot:~$

Ever since I upgraded the system to KDE 4.1.3 (kubuntu 8.10) the system is unusable under KDE. Any time I type something or I move the mouse the sytem goes black. It will then go back to the "normal" display until I type somthing again in which case it goes black again. There is no crash the system is running kind of OK but is is unusable as the display disappear (goes black) any time I try to interact with the system.

Note that I a getting the same bahavior with the kubuntu live CD so it should not be something with my KDE desktop configuration.

One additional data point is that the system CPU is not overloaded (top show the system load around 1 to 5%)

Also KDE applications (kontact, konqueror, ...) are running mostly fine (without spurious black screen) under another environement like XFCE for example.

I am typing this report under KDE at the moment and it is very painfull ...

If you need any more data on my system, please ask ...