Kernel 2.6.38-7 completely dims screen on Intel GMA 4500M
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Expired
|
Medium
|
Unassigned |
Bug Description
Display hardware specifications [sudo lshw -c display]:
*-display:0
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
resources: irq:44 memory:
*-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
resources: memory:
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.
10.10
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.
11.04
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 I experienced in 10.10. 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
summary: |
- Kernel 2.6.38-7 completely dims screen + Kernel 2.6.38-7 completely dims screen on Intel T4500M |
summary: |
- Kernel 2.6.38-7 completely dims screen on Intel T4500M + Kernel 2.6.38-7 completely dims screen on Intel GMA 4500M |
description: | updated |
description: | updated |
Changed in linux (Ubuntu): | |
status: | Incomplete → Confirmed |
tags: | added: maverick |
tags: |
added: needs-upstream-testing removed: apport-collected oneiric running-unity |
Changed in linux (Ubuntu): | |
status: | Incomplete → Confirmed |
On my laptop it's the same.
If i boot with 2.6.38-6 kernel, it's ok but if i boot the 2.6.38-7 kernel then i only have an 'almost black screen' as described above.
Here is my lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09)
(I tried the same kernel with archlinux: it s the same)