aa video output driver shows incorrect picture while using monitor_pixel_aspect's default value 1. Since letter size is approximately 1:2, aa works ok if monitor_pixel_aspect == 0.5. The patch sets monitor_pixel_aspect to 0.5 if it was equal to 1. The user still can set monitor_pixel_aspect to any other value, except 1. Also, the old test method for "linux" aa driver checks file named like /dev/vcsa01. Now udev names such files like /dev/vsca1. The problem is fixed by checking both /dev/vsca1 and /dev/vcsa01. The old method of checking if the file is writable uses fopen(fname, "w+"). It causes /dev/vcsaXX to be created if it doesn't presents and the user can write to /dev. The new method is to use open(fname, O_WRONLY). AA library has a nice display driver called "slang". It works even if /dev/vcsaXX is not writable. It would be better if "slang" were recommended to aalib.