My last update of Arch Linux affected quite a few packages including updating the kernel to 2.6.36. There was one more issue in addition to the resumption from sleep problem. The additional issue related to graphics effects of KDE.
The edge effect of showing all the windows worked. However, I could not select any of the windows and there was no way to return to a usable window. The display seemed to hang.
I could switch to a tty (ctrl+alt+Fn) and 'pkill ksmserver' to get a new login and start a new desktop session. My workaround was to disable desktop effects until I found the cause.
I rolled back a number of packages which seemed likely, e.g. kernel, mesa, xf86-video-intel. Finally, I located that the culprits were intel-dri and libgl. I had to downgrade both from 7.9-1 to 7.8.2-3.
I also needed to downgrade xf86-video-intel from 2.13.0-4 to 2.12.0-3. The display did not freeze but was very erratic and unstable.
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