[Bug 216221] Re: Samsung Q70 - error while modprobing video, also can't adjust backlight

Wildy wildy at wildy.pp.ru
Wed Jul 30 06:51:10 UTC 2008


Hi!

You just need to cat the value while in textmode. Just switch to another
VT, log in and then use 'sudo su -', then cat it
into /proc/acpi/video/NVID/LCD/brightness. Supposingly, the NVidia
drivers prohibit ACPI interfacing when you're in X.

WBR,
Yuri

В Втр, 29/07/2008 в 20:51 +0000, Baju пишет:
> My Q70 boots up ubunut 8.04.1 without any problems but I cannot adjust brightness.
> I've already tried the keys on the keyboard, any brightness setting programm from the repros and writing a value to /proc/acpi/video/NVID/LCD/brightness. I'm a bit afraid of trying to install the drivers via envy since i have not read anything about anybody solving the problem with it.
> Some debug infos:
> 
> hannes at hannesNotebook:~$ xbacklight 
> No outputs have backlight property
> 
> hannes at hannesNotebook:~$ dmesg|grep acpi
> [    0.000000] ACPI: If "acpi_apic_instance=2" works better, notify linux-acpi at vger.kernel.org
> [    0.000000] ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1])
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
> [  138.041010]  [<ffffffff80388e42>] acpi_ut_update_ref_count+0x50/0x9d
> [  138.041017]  [<ffffffff803892ed>] acpi_format_exception+0x2c/0x35
> [  138.041021]  [<ffffffff80388087>] acpi_ut_exception+0x25/0x8c
> [  138.041033]  [<ffffffff803737e8>] acpi_evaluate_integer+0xb6/0xc7
> [  138.041043]  [<ffffffff88215c8a>] :video:acpi_video_bus_add+0xc37/0xc4d
> [  138.041054]  [<ffffffff8038cae8>] acpi_device_probe+0x43/0x91
> [  138.041091]  [<ffffffff8807203c>] :video:acpi_video_init+0x3c/0x5f
> [  138.041111]  [<ffffffff8038ce3c>] acpi_bus_register_driver+0x0/0x3c
>

-- 
Samsung Q70 - error while modprobing video, also can't adjust backlight
https://bugs.launchpad.net/bugs/216221
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