Bug 672716

Summary: 2.6.38rc Kernels break LCD brightness adjustment on Acer Laptop
Product: [Fedora] Fedora Reporter: Andy Lawrence <dr.diesel>
Component: kernelAssignee: Kernel Maintainer List <kernel-maint>
Status: CLOSED RAWHIDE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: low Docs Contact:
Priority: unspecified    
Version: rawhideCC: cunio, gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2011-02-20 04:15:04 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
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Description Flags
dmesg dump
none
my dmesg none

Description Andy Lawrence 2011-01-26 00:10:17 UTC 
Description of problem:

Kernel 2.6.38-0.rc2.git1.3.fc15.x86_64 breaks (all Fedora 38 Builds so far actually) LCD brightness function keys on Acer laptop.  This works fine in 2.6.37 Fedora builds.  I have not tried a vanilla 2.6.38rc build.  Gnome/XFCE both have this problem updates as of today.


Version-Release number of selected component (if applicable):

Any 2.6.38rc Fedora Kernel

How reproducible:

Always.


00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) (prog-if 00 [VGA controller])
	Subsystem: Acer Incorporated [ALI] Device 029b
	Flags: bus master, fast devsel, latency 0, IRQ 43
	Memory at d0000000 (64-bit, non-prefetchable) [size=4M]
	Memory at c0000000 (64-bit, prefetchable) [size=256M]
	I/O ports at 30d0 [size=8]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
	Capabilities: [d0] Power Management version 3
	Kernel driver in use: i915
	Kernel modules: i915

00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
	Subsystem: Acer Incorporated [ALI] Device 029b
	Flags: bus master, fast devsel, latency 0
	Memory at d2400000 (64-bit, non-prefetchable) [size=1M]
	Capabilities: [d0] Power Management version 3

Please see attached dmesg output.  Happy to provide any other info or test builds etc.
Comment 1 Andy Lawrence 2011-01-26 00:11:34 UTC 
Created attachment 475306 [details]
dmesg dump
Comment 2 Jacek Pawlyta 2011-01-26 12:56:40 UTC 
Confirming the same: Lenovo G550 with 
VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09)
Lenovo keys for brightness control don't work,
KDE Power Management applet can't set/change the brightness.
Comment 3 Andy Lawrence 2011-01-27 22:21:08 UTC 
Jacek, did kernels < 2.6.38 work OK for you also?  Could you please attached dmesg?

Thanks
Comment 4 Jacek Pawlyta 2011-01-28 07:51:46 UTC 
Andy,
kernel 2.6.37 was OK with backlight control, it had other problems, but LCD backlight control had been working.
Comment 5 Jacek Pawlyta 2011-01-28 08:05:13 UTC 
Created attachment 475745 [details]
my dmesg

dmesg for Lenovo G550
Comment 6 Andy Lawrence 2011-02-01 23:12:13 UTC 
Just tested a vanilla 2.6.38rc3, same problem, filled it upstream also.  Upstream tracker listed above.
Comment 7 Jacek Pawlyta 2011-02-18 09:47:47 UTC 
With 2.6.38-0.rc5.git0.1.fc15.x86_64 LCD backlight control works OK at least on Lenovo G550.