Discussion:
[Bug 86121] New: Regression: NVIDIA backlight not working after latest vgaarb change
Bjorn Helgaas
2014-10-13 15:47:40 UTC
Permalink
https://bugzilla.kernel.org/show_bug.cgi?id=86121
Bug ID: 86121
Summary: Regression: NVIDIA backlight not working after latest
vgaarb change
Product: Drivers
Version: 2.5
Kernel Version: 3.16.5
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: PCI
Regression: No
Created attachment 153311
--> https://bugzilla.kernel.org/attachment.cgi?id=153311&action=edit
kernel boot logs & config
I have experienced a regression in backlight control with NVIDIA binary blob
driver and kernel 3.16.5. I did a bisect between 3.16.4 and 3.16.5 and found
out that the regression happens with commit "ce027dac vgaarb: Don't default
exclusively to first video device with mem+io"
I have attached kernel boot log with working backlight (commit 7babfd7f) and
non-working one (commit ce027dac) plus the config used.
I'm running Ubuntu 14.10
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