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Bug 338760 - acpi set brightness to low during boot on HP envy 17 & 14
Summary: acpi set brightness to low during boot on HP envy 17 & 14
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: [OLD] Unspecified (show other bugs)
Hardware: All Linux
: High normal (vote)
Assignee: Gentoo Kernel Bug Wranglers and Kernel Maintainers
Depends on:
Reported: 2010-09-26 09:15 UTC by lixo1
Modified: 2011-01-01 23:02 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


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Description lixo1 2010-09-26 09:15:52 UTC
Booting with gentoo option from the minimal CD installation on the HP envy 17 & 14, I observed that the screen brightness is modified to 0 when the ACPI is activated (saying [ok]).

If I use gentoo acpi=off, or gentoo acpi=ht, the problem disappears, but probably wifi, audio, etc... doesn't work anymore.

If you need further information please don't hesitate.

Reproducible: Always

Steps to Reproduce:
1. Download the lastest gentoo minimal CD version.
2. Boot with gentoo option, on a HP envy 17 or 14.
3. Wait for acpi activation.

Actual Results:  
After ACPI activation brightness goes to 0 value.

Expected Results:  
Brightness should not change.
Comment 1 lixo1 2010-11-01 22:41:37 UTC
(In reply to comment #0)
This bug is also present on normal gentoo kernel >= 2.6.34.
Comment 2 Jorge Manuel B. S. Vicetto Gentoo Infrastructure gentoo-dev 2010-12-01 18:18:22 UTC
In that case I'm reassigning this bug to the kernel team.
Comment 3 Mike Pagano gentoo-dev 2010-12-17 14:02:25 UTC
Have you tried: acpi_backlight=vendor as a kernel parameter?
Comment 4 lixo1 2011-01-01 23:02:53 UTC
This bug comes from a conflict between video acpi and HP envy Bios model when setting brightness to the initial value. It's a kernel/hp main tree issue.

There is a patch in test, available from the main kernel source, that will be applied in the future releases > 2.6.37.

So, I close this bug report. Thanks for your interest.