LCD brightness on HP dv6 sandy bridge

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mehraan

LCD brightness on HP dv6 sandy bridge

Post by mehraan »

Hi

I installed Mint 11 64-bit on my HP Pavilion dv6-6193. The laptop comes with dual graphics, an Intel sandy bridge integrated graphics and an ATI Radeon 5490M 1GB.

When I try to adjust the screen brightness, the hot-keys bring up the brightness applet and show that changing. However the actual screen brightness does not change.
I checked /proc/acpi and there is no /proc/acpi/video.

I tried booting with combinations of 'acpi_osi=Linux' and 'acpi_brightness=vendor'. No luck!

Any suggestions?
TIA!
Last edited by LockBot on Wed Dec 28, 2022 7:16 am, edited 1 time in total.
Reason: Topic automatically closed 6 months after creation. New replies are no longer allowed.
viper

Re: LCD brightness on HP dv6 sandy bridge

Post by viper »

mehraan wrote: 'acpi_brightness=vendor'
I think its supposed to be "acpi_backlight=vendor"?
bob_summers

Re: LCD brightness on HP dv6 sandy bridge

Post by bob_summers »

Same problem here (though dv6-6151, Radeon 6770M (blacklisted, running Intel graphics only).

Tried those boot tags but they made no difference.
There are a few things that aren't working on this laptop under linux, but the LCD brightness is the most inconvenient., if you don't count the hybrid graphics

I can reduce the brightness using

Code: Select all

xrandr --output LVDS1 --brightness 0.5
for example, but haven't found anything to suggest that could be somehow linked to the hotkey inputs.


Interested to hear any theories!

Bob
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