Red Hat Bugzilla – Bug 753685
Grub2 Brightness at Lowest Level During Boot
Last modified: 2013-02-13 16:12:17 EST
Description of problem: Grub2 sets screen brightness at lowest possible level.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Install Fedora 16 with Grub
3. Screen gets reset to lowest brightness setting.
Should be a minimal or max brightness so that user can actually see the screen.
Dark screen to low brightness.
Lenovo W520 Intel Graphics (Discrete Nvidia 1000M doesn't work at all on F16)
Tried to configure options:
Exactly what do you see, and why do you think it is grub2 that do something incorrectly?
Do you see full brightness in the BIOS? And low brightness at the grub2 menu?
I doubt that grub2 is aware of the brightness level at all.
Kernel parameters will only be used by the kernel that is launched by grub2, so they would never be able to fix a problem in grub2.
It was an assumption that grub was the issue, I could be wrong.
When grub comes online the screen is bright, but the moment it starts loading the ramdisk, the screen goes dark.
Yeah, that points at something grub.
Can you try to choose the option for editing the boot menu and try to remove the load_video line and boot that?
Do the brightness go away at the same place?
Yes, the brightness goes away right at the loading initial ramdisk.
Can you try to remove the ramdisk line and try to boot and see exactly when the brightness goes away? (The boot will then fail with a kernel oops that you might or might not see.)
Do you see the same or different behaviour with a Fedora 16 live cd or other Fedora versions or other Linux distributions?
I haven't tried the Live CD but the screen issue did happen when installing F16.
Do you still see this issue?
Can you try with a f17 beta live cd?
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