I posted a few bugs earlier on the forum http://forums.linuxmint.com/viewtopic.php?f=109&t=22736#p133438
, but now that this bug thread has been made available, re posting them here.
I'm also facing the issue dberg918 mentioned above regarding the power manager. When I enter the password and log in for the first time (as the KDE splash screen shows up), either the power manager or screen saver (which I tried to set to off), kicks in immediately and locks the screen. So essentially, I need to enter my password once again to reach the desktop.
Other Bugs -
1) My screen brightness gets reset back to the lowest setting every time I login to the system. The brightness gets reset exactly at the time when the KDE splash shows the desktop being loaded, so I hope that narrows it down a bit. Some Ubuntu threads have claimed that this is a regression bug reintroduced into Intrepid release, but for them the brightness is getting set to max, whereas for me, its doing the opposite. Below are some of the relevant Ubuntu bug threads -http://forums.linuxmint.com/viewtopic.php?f=109&t=14574&st=0&sk=t&sd=a&start=240#p133434http://forum.kde.org/brightness-settings-on-laptop-t-12527.htmlhttp://ubuntuforums.org/archive/index.php/t-790543.htmlhttps://bugs.launchpad.net/ubuntu/+bug/332264
Haven't yet found a workaround for this.
2) I'm unable to drag and move the panel widgets even though they are not locked to the panel.
Solved. You need to open panel settings option, and only while it is on, the unlocked widgets can be moved around. I know, its my typical Windows/Gnome mentality that I should be able to drag widgets on the panel as long as they are unlocked, so anyway, this is a typical GUI design scenario, and not a bug. I don't want to comment on which of the above is a better design case
A secondary observation is that changing the panel height changes some of the icons displayed on the panel. I tested this after changing my icon set to Linux Mint KDE 4 set. For eg. the show desktop is a small blue rectangle icon when the panel height is set very small. Increasing the panel height changes it to a green icon with desk lamp pic. The home folder icon changes from blue to green (i think the first icon belongs to the default Oxygen set, whereas the second icon set belongs to the Linux Mint KDE 4 set I've selected). My guess is that KDE is determining at real time the best icon set to display for any given panel height, and defaulting to the Oxygen icon set when it finds its unable to display the LM KDE 4 set on the panel. But I don't know if this is a desired behavior or not, considering how many folks want their icons to look in just one particular way.
3) The system date time settings is unable to contact the time zone server, and doesn't let me change the time and zone settings (internet is connected).
Haven't been able to fix this. Tried all the 4 servers listed in the dropdowns for various regions, but none of them connected.
4) Some of the KDE apps are simply quitting at times (not always) without any notification when I click on them.
This got a bit better after I downloaded and installed all the recommended patches from Mint repo., but occasionally still happens. Mind that its not an applet crash, which throws a bug trace screen. This happens usually when I try to start some app. The icon animation kicks in, a window tab is displayed on the panel, but can't be opened, and simply disappears after some time.
5) Desktop effects are not enabled, and reports that the Compiz engine needs to be installed first (I've been assuming that Compiz should be available by default in the install packages, so please correct me if I'm wrong). Apparently this is an Ubuntu 8.10 issue, though I'm not on any Intel Graphics card, but a GeForce 8600GT. I'm going to try out this suggestion viewtopic.php?f=59&t=20538#p126147
and post back later.
As suggested by locutus in another thread, I tried using fusion-icon and it was able to load up Compiz, but there are occasionally some interface issues. Like, Konqueror and Firefox windows do not display the top panel (i.e. where the window name and the _,,X buttons exist). I had to close them using file-exit. This usually occurs whenever I choose Compiz, and then select reload display manager option in Fusion-icon. Although, desktop effects app. still shows that the Compiz engine needs to be installed.
6) I can increase the Folder View widget size horizontally by dragging on the  control, but can't increase the size vertically. Dragging downwards on the  control reduces the folder view widget height. This widget also cannot be re-sized by dragging at the borders. I guess I'll be reverting back to the traditional desktop http://hanswchen.wordpress.com/2009/01/ ... in-kde-42/
option for now and live with that.
Reverted to folder view as default, and liking it
Oxygen/Ozone have some display kinks where the interface looks rough (eg. open Compiz Settings, and go to General settings. The tabs displayed there will show what I mean, i.e. the tabs look as if their ends are overlapping with the neighboring tabs).
I'll post as and when I find other issues. Thanks once again for an awesome release
. I'm really liking KDE 4.2 in general. It looks much more polished than Gnome.