Hey, I found a better way than loading 915resolution! I use thinkpad e420 which has a resolution of 1366*768 but Xvesa couldn't display that way,and 915resolution said it couldn't determine my chipset type. So I installed xf86-video-all.tcz, graphics-3.0.3-tinycore.tcz and Xorg-7.6-3d.tcz. Note that you have to download only them instead of Onboot because system may halt during loading. Then modify your onboot.lst, put xf86-video-all.tcz on top and put the others after all the default items. Then it works!