Here are a list of a few bugs that I have run into with Portal (installed via Steam)
My system is:
3.0 Ghz Pentium D
2GB ram
GeForce 8600 GTS with Nvidia Driver Version 169.12
2 1680x1050 screens with Xinelarra enabled (using TwinView from the nvidia-settings utility) for a full desktop size of 3200x1050
Gnome desktop environment with Compiz
Operating System: Slackware Linux 12.0 with the 2.6.24.3 kernel
So, on to the bugs:
Incorrect Screen Resolutions:
Portal will only allow 16:9 screen resolutions; even when set to run in Windowed mode. I worked around this by entering the Wine configuration and setting the win2000 bottle to run applications inside of a virtual desktop with a resolution of 1024x768. I had to start and stop portal and set it to run in full screen with this setting on, then restart portal, then go in and I was able to change the resolution to 4:3 1024x768 full screen.
Some missing text and graphics:
Some text (text on the main screen, as well as some text in game) doesn't appear. Instead, I just see black boxes. I also see two black boxes instead of the crosshair icons for the Portal gun.
Uneven performance:
The framerate while playing is erratic. Although I did not have the fps display enabled, the framerate will occasionally noticeably drop. A few months ago I had been running Portal under vanilla wine, on this rig, also with compiz enabled. Because of this, I don't think that it is a problem with compiz and my system not keeping up, although it's not exactly the same setup software-wise as I had when running under vanilla wine, so it might be a problem somewhere else.
Anyway, great job overall on Crossover games. I've been looking for a long time for a way to ditch Cedega, since their customer support is absolutely abysmal, looks like I'll be saving $5/month from now on.