Comment 135 for bug 568611

I installed the kernel but on booting,I was greeted with a black screen after selecting kamals kernel from the boot menu! Thank God I hadn't removed my previous kernel so i rebooted back into the 2.6.35.23 kernel and appended the options "acpi_osi=Linux acpi_backlight=vendor" at the GRUB_CMDLINE_LINUX_DEFAULT key in the /etc/default/grub file. I rebooted into kamals kernel but the screen was still black I toyed with Fn+LEFT and Fn+RIGHT keys which adjust screen brightness on my Acer Aspire 5734z, it worked, the screen slowly gained brightness but I noticed something weired which judging from this page, it was expected. The adjustments were inverse, Bright meant Dim and the other way round. I had also checked "Dim when Idle" option in my System>Preference>Power Management and so something else, when Idle, the screen brightens! All this is weired but many thanks to Kamal Mostafa, at least we have even the slightest control over screen brightness, my eyes are photophobic so you can imagine what this bug-fix means to me. I read somewhere in ubuntu forums about trying to remove gnome power manager at start up then starting it up manually at the command line as a workaround for the black screen at start up, well that seems like a huge sacrifice so I haven't tried it but lest I'm forced to, I'll let you guys know of my findings.