Latest working kernel version: NA Earliest failing kernel version: 2.6.27.4-58.fc10.i686 Distribution: Fedora rawhide Hardware Environment: i386, C714NR laptop Software Environment: Fedora i386 Problem Description: During the booting backlight goes to maximum and stays there. But it can be control by the function key. Steps to reproduce: Start linux and backlight goes to maximum
Created attachment 18509 [details] acpidump
Created attachment 18510 [details] lspci -vv
Yes, this is introduced by c2c789057f075022658b38b498755c29c1ba8055 If _BQC is not available, we don't know the initial brightness level. In this case, set the backlight to maximum. I don't see any problems with this proposal. Sachin, please reopen it if you still have any questions. :)
Zhang, I apologies for reopening the bug but this means it cannot be fixed ? Wow that was speedy reply!!!!!!! Regards, Sachin.
(In reply to comment #4) > but this means it cannot be fixed ? you're right. In fact, this is what we want in this patch. Because we want to make sure we get the right backlight state during initialization. Usually _BQC method helps us in many laptops. It returns the current brightness level. but as it's not available on this laptop, we need to set the backlight to some certain state, i.e. the maximum brightness level. :) as users can control the backlight after boot, this won't bring many troubles to you, right? or do you think it's unacceptable?
Can we pass brightness level as the argument.