I have AMD Radeon 7470M 1GiB garphics card. I installed Ubuntu in the nomodeset, after my first boot, I just opened it from boot screen by pressing 'e' and replaced “quiet splash” with "nomodeset". It worked fine; I can log in but after that I installed AMD catalyst drivers for my graphics card. They are not working and even I opened the rc.local file as the root user 'sudo nano /etc/rc.local' copied and pasted the following lines just before the line exit 0 :
1) chown -R $USER:$USER /sys/kernel/debug 2) echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
it doesn't work for me. Every time which I boot to OS I need to replace "quite splash" with "nomodeset" by pressing 'e' in the boot screen; only then can I log in to Ubuntu.
How can I fix this? It's very difficult to replace that thing every time.