Comment 0 for bug 740893

Display hardware specifications:
       description: VGA compatible controller
       product: Mobile 4 Series Chipset Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 09
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:44 memory:50000000-503fffff memory:40000000-4fffffff ioport:50f0(size=8)
  *-display:1 UNCLAIMED
       description: Display controller
       product: Mobile 4 Series Chipset Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2.1
       bus info: pci@0000:00:02.1
       version: 09
       width: 64 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list
       configuration: latency=0
       resources: memory:53400000-534fffff

I'm not sure about what factors exactly are leading to this result, but installing the said version of the kernel package on either 10.10 and 11.04 completely darkens my screen. If I press the power button or open a window with keyboard shortcuts I can make out they're open but can't view them at all.

I downloaded 2.6.38-7 kernel package for Ubuntu and installed them on 10.10 dual-booted with Windows 7. On reboot I could not make out anything on the screen, and assuming Ubuntu did not load properly, I was about to try a hard shutdown. But on pressing the power button, I noticed that there was a dim glow of the Shut Down window , from which I selected restart using the keyboard. Since the next boot did not improve anything, I chose older kernel, which displayed everything normally again.

Installing Natty wiped of my HDD of 10.10 and Windows 7 for which I suspect an unrelated bug. The said kernel image installed through the usual updates, and I was returned to the dim screen. Since I did not know how to bring up the GRUB menu at boot with a single OS, I used a flashlight to find the kernel package on Software Center and removed it. Screen worked fine after reboot.

Thus I conclude that the kernel image is at fault for the screen dimming. As I said, I'm not aware of all the possible factors involved in this bug, so I've listed my display hardware specifications for now and narrated to how I've come to suspect the kernel image for this bug. Please post your thoughts on this matter, and instruct me on diagnosing it.

I've removed the kernel package, so I cannot comply with bug reporting guidelines, but this is my current output of 'lsb_release -rd':
Description: Ubuntu Natty (development branch)
Release: 11.04