David Timms writes:
Sam Varshavchik wrote:Perhaps it is a direct hardware controlled function that only operates once the cpu is running in protected mode {ring 3}, or acpi/dmi function that operates once the kernel loads drivers for such.Tomasz Torcz writes:Grepping through the various kernel modules, the only culprit I can find is a "tsl2550.ko' -- a "TSL2550 ambient light sensor driver", but I don't have this module loaded at allDnia 13-12-2007, czw o godzinie 07:12 -0500, Sam Varshavchik pisze:> /apps/gnome-panel-manager/ambientThe only applet I see is the "Brightness" applet, I don't have any "Ambient" applet. Is that in a separate package? yum shows nothingStrange mystery.If the second is the case you could try kernel parameters to disable acpi (for a giggle).
What a laugh, indeed. Turning off ACPI did disable this pesky ambient light sensor.
… and made the LCD backlight come up at about the 70% brightness level. Unfortunately, I need to keep my eyes in working order, for the foreseeable future, so I need 100% brightness.
And, of course, since ACPI is disabled, gnome-power-management no longer had knobs to adjust the brightness level.
Hardy, har har, indeed.
There might be direct control available from the /proc file system ?
I find nothing obvious in /proc/acpi, aside from someone's idea of a practical joke that I already bugzillaed a month or so, ago:
$ ls -al /proc/acpi/video total 0 dr-xr-xr-x 4 root root 0 2007-12-14 19:42 . dr-xr-xr-x 11 root root 0 2007-12-14 19:38 .. dr-xr-xr-x 5 root root 0 2007-12-14 19:44 VGA dr-xr-xr-x 5 root root 0 2007-12-14 19:44 VGA Yes, I have two /proc/acpi/video/VGA directories.
By the way, what manu/model is it ?
Whitebox laptop. dmidecode sez: Handle 0x0001, DMI type 1, 25 bytes. System InformationManufacturer: ASUSTeK Computer Inc. Product Name: M7V Version: 1.0 Serial Number: SSN12345678901234567
UUID: 28CE5D8A-0000-0080-385D-0017312C16F2
Wake-up Type: Power Switch
Love that serial number.
There's nothing in dmidecode's output that references anything that might
shed some light on this.
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