Bug 79911

Summary: [gm965] Screen brightness defaults to lowest setting: Dell D630
Product: Drivers Reporter: iknowjoseph
Component: Video(DRI - Intel)Assignee: intel-gfx-bugs (intel-gfx-bugs)
Status: RESOLVED INSUFFICIENT_DATA    
Severity: normal CC: alan, intel-gfx-bugs
Priority: P1    
Hardware: i386   
OS: Linux   
Kernel Version: 3.15.0 Subsystem:
Regression: Yes Bisected commit-id:

Description iknowjoseph 2014-07-10 13:24:40 UTC 
I'm running Ubuntu 12.04 on my Dell D630 and today updated the kernel to the latest stable release. Previously I was running the latest as provided by Canonical (3.2?).

Whilst booting my laptop screen displays at the lowest backlight setting. This also happens if the screen has been locked for some time. Once logged in I can use the keyboard Fn keys to raise the brightness to it's usual lever. Always running on AC.

What's happening: Screen brightness is at it's lowest level until I increase it
What I expected to happen: Screen brightness stays at maximum whilst on AC power

Please me know what I need to attach to this ticket to make it more useful.

Thanks, Joseph
Comment 1 iknowjoseph 2014-07-10 13:26:44 UTC 
joseph@joseph-work:~$ uname -a
Linux joseph-work 3.15.0-031500-generic #201406131105 SMP Fri Jun 13 15:26:26 UTC 2014 i686 i686 i386 GNU/Linux
joseph@joseph-work:~$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) (rev 0c)
joseph@joseph-work:~$ sudo lshw -class display
[sudo] password for joseph: 
  *-display:0             
       description: VGA compatible controller
       product: Mobile GM965/GL960 Integrated Graphics Controller (primary)
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 0c
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:43 memory:fea00000-feafffff memory:e0000000-efffffff ioport:efe8(size=8)
  *-display:1 UNCLAIMED
       description: Display controller
       product: Mobile GM965/GL960 Integrated Graphics Controller (secondary)
       vendor: Intel Corporation
       physical id: 2.1
       bus info: pci@0000:00:02.1
       version: 0c
       width: 64 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list
       configuration: latency=0
       resources: memory:feb00000-febfffff
joseph@joseph-work:~$
Comment 2 Jani Nikula 2014-08-14 13:02:52 UTC 
Please attach dmesg with drm.debug=0xe module parameter set, from early boot. Please try 3.16 kernel.
Comment 3 Jani Nikula 2014-09-23 14:29:45 UTC 
iknowjoseph@gmail.com please attach the information requested in comment #2.
Comment 4 Jani Nikula 2015-01-28 14:10:29 UTC 
Timeout, closing. Please feel free to reopen if the problem persists on recent kernels.