Hälp! Pixel junk, broken GUI, screen blanking and freezes after resuming from suspend

[abalone]

KDE no longer works properly after resuming from suspend-to-RAM. The first suspend/resume cycle still works ok some of the time; otherwise, there's a little pixel junk stuck to a GUI element or the desktop. The next time around, the GUI is no longer drawn completely and/or is laggy/unresponsive. The screens keep going blank intermittently (as in "no signal"). The mouse gets "stuck" a lot.

If I manage to run "kwin --replace", everything's magically okay again. Would that suggest it's not, in fact, time to buy yet another AGP graphics card (of great antiquity)?

I see a lot of these in Xorg log:

Backtrace:
[ 1129.747] 0: /usr/bin/Xorg (xorg_backtrace+0x37) [0x982f87]
[ 1129.747] 1: /usr/bin/Xorg (mieqEnqueue+0x223) [0x9612d3]
[ 1129.747] 2: /usr/bin/Xorg (0x7fb000+0x4cac5) [0x847ac5]
[ 1129.748] 3: /usr/bin/Xorg (xf86PostMotionEventM+0xf9) [0x888b69]
[ 1129.748] 4: /usr/lib/xorg/modules/input/evdev_drv.so (0x42d000+0x3c3d) [0x430c3d]
[ 1129.748] 5: /usr/lib/xorg/modules/input/evdev_drv.so (0x42d000+0x524f) [0x43224f]
[ 1129.748] 6: /usr/bin/Xorg (0x7fb000+0x78081) [0x873081]
[ 1129.748] 7: /usr/bin/Xorg (0x7fb000+0x9fab8) [0x89aab8]
[ 1129.748] 8: (vdso) (__kernel_sigreturn+0x0) [0x110400]
[ 1129.748] 9: /usr/lib/i386-linux-gnu/xorg/extra-modules/nvidia_drv.so (0x1c42b000+0x61bf9) [0x1c48cbf9]
[ 1129.748] [mi] These backtraces from mieqEnqueue may point to a culprit higher up the stack.
[ 1129.748] [mi] mieq is *NOT* the cause. It is a victim.
[ 1129.748] [mi] Increasing EQ size to 512 to prevent dropped events.
[ 1129.749] [mi] EQ processing has resumed after 13 dropped events.
[ 1129.749] [mi] This may be caused my a misbehaving driver monopolizing the server's resources.

Is this happening to anyone else? Googling just brings up Flash issues, but I don't seem to have them. The ttys are unaffected, too. Stuff like VLC or glxgears runs fine. Desktop effects run fine. It's just that after resuming from suspend I have to restart kwin. Very annoying!

I'm using the proprietary Nvidia drivers. Everything's up-to-date. I can't test it with Nouveau because that won't let me suspend successfully in the first place.

[Snowhog]

Try some basic trouble shooting. First, disable all Desktop Effects and suspend-to-RAM again. Do you experience the same issue when resuming?

[abalone]

No, at least not so far. I tried it about 5 times. So I suppose as a workaround I could disable effects first before suspending and then reactivate them afterwards: no "screen garbage" if I do it in that order. Thanks for the idea! But what could be broken?

Edit: kwin --replace doesn't always fix it.

[Snowhog]

Re-enable Desktop Effects but disable Blur. Try again.

[abalone]

Seems to be working nicely now. I had only turned blur on a few days ago... I can live without it if I switch to a non-transparent plasma theme.

[Snowhog]

Blur is a GPU HOG. I can't use it at all with my (lowly) Intel GPU. It is an 'eye candy' effect I can live without. I just use transparency settings instead.

[abalone]

Can I change the transparency level of plasma themes, not just "normal windows"? I like the Caledonia theme, but its widgets are terribly busy-looking with the whole background shining through. I only needed Blur to compensate for a transparency I didn't want

[Snowhog]

Don't have an answer for that, but others might. I use a dark plasma theme - Oxygen - with a dark desktop wallpaper.

[abalone]

I switched to Big Blue for now... plain but friendly. And also blue. Oxygen is very usable, too, I just don't like the silver highlights much. Eh, I change everything around every other day anyway...