Comment 124 for bug 765438
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| Ihorko (ihorchyhin) wrote Re: On startup, the backlight is off on laptop | #124 |
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35a32c5
(Get the code!)
On my HP 62-a35er with integrated intel gpu and discrete radeon gpu fix is not correct. If I don't add kernel parameter acpi_backlight=
As I tested at boot there are 4 items under /sys/class/
acpi_video0
acpi_video1
intel_backlight
radeon_bl1
After login brightness is controlled under acpi_video1 for some reason.
But brightness was set under intel_backlight to 4394 (maximum 4882).
Kernel version: 3.7.5-1 (currently I use Arch but believe that kernel in Ubuntu is roughly the same)