Fedora 16 brightness issue in Acer Aspire 4750

I recently bought an Acer Aspire 4750, it’s a cool laptop, the only thing I regret it’s the screen resolution, I’m used to a Full HD Monitor, since I have one at work and in my desktop (still use it)… but, this is not about that.. it’s about a brightness issue in my laptop, since I can’t use the FN key + left and right arrow to lower or upper the brightness out of the box in Fedora 16.

This is the solution:

Edit /etc/grub2.cfg (you obviously need to be root to do so) and at the line that starts with “linux /vmlinuz-…” add this at the end:

"acpi_backlight=vendor acpi_osi=linux" (without the quotes, of course)

If you don’t know how to do this:

vi /boot/grub/grub.conf

So for example your first Fedora block should become:

menuentry 'Fedora (3.2.6-3.fc16.x86_64)' --class fedora --class gnu-linux --class gnu --class os {
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod ext2
	set root='(hd0,msdos2)'
	search --no-floppy --fs-uuid --set=root 8172b21b-d5f0-44b2-a899-d6c5d91d9311
	echo 'Loading Fedora (3.2.6-3.fc16.x86_64)'
	linux	/vmlinuz-3.2.6-3.fc16.x86_64 root=/dev/mapper/vg_wportalaptop-lv_root ro rd.md=0 rd.dm=0 rd.lvm.lv=vg_wportalaptop/lv_swap rd.lvm.lv=vg_wportalaptop/lv_root quiet SYSFONT=latarcyrheb-sun16 rhgb rd.luks=0 LANG=es_ES.UTF-8  KEYTABLE=es acpi_backlight=vendor acpi_osi=linux
	echo 'Loading initial ramdisk ...'
	initrd /initramfs-3.2.6-3.fc16.x86_64.img

You may want to try this with the first block in your grub2.conf, so if something goes wrong you can always boot with an old kernel and fix it.

Hope it works for you..



4 thoughts on “Fedora 16 brightness issue in Acer Aspire 4750

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