did you look at the logs? if you haven't already looked at them dmesg and /var/log/rc.log have information that could help you pinpoint the problem. one of the earlier live-cds had that problem and I got around it by starting the the cd with "gentoo noacpi nox" options though I doubt this can help in your case. could you provide some more information like the logs, the loader conf files and may be .config of your kernel make?
michael -- Michael Scherer Univ.klinik f. Psychiatrie email: michael.sche...@meduniwien.ac.at phone: +43 6991 941 22 54 ----- Original Message ----- From: Zhang Jun To: gentoo-user Sent: Sunday, 22 April, 2012 08:25 Subject: [gentoo-user] laptop screen goes dark in boot laptop: asus F3TC, amd Turion, NV-go7300 kernel-3.0.17-r1 tuxonice screen goes dark just after I see the linux boot logo, when using kernel 2.6.x, I even do not use hotkey to control lcd backlight, default light is ok, but now, it goes dark, re-compiled kernel many times, but no luck, in kernel acpi config page, I did't see the "video" module, and seems no /proc/acpi/video/ . is there anyone have met this problem and have solution ? thanks!
