https://bugzilla.kernel.org/show_bug.cgi?id=44451
Lee, Chun-Yi <j...@novell.com> changed:
What |Removed |Added
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CC| |j...@novell.com
--- Comment #6 from Lee, Chun-Yi <j...@novell.com> 2012-08-15 10:13:02 ---
(In reply to comment #0)
> Created an attachment (id=75221)
--> (https://bugzilla.kernel.org/attachment.cgi?id=75221) [details]
> various dumps (acpidump, iasl, fwts, dmidecode, dmesg etc)
>
> Backlight can't be controlled in Aspire One D270.
> booting with acpi_backlight=vendor doesn't change a thing.
> /sys/class/backlight is empty.
>
> This was reported in
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/974806
> but it appears like the reporter never followed up with the recommendation to
> upstream the bug (I didn't find anything on "D270 backlight" on
> bugzilla.kernel.org), so I'm doing it here.
>
> My system:
> Ubuntu 12.04 LTS, kernel 3.2.0-25-generic-pae
> The previous reporter checked it with 3.2.0-22.35
>
> /sys/class/backlight is empty.
> /proc/acpi/video does not exist
> 'ACPI: Video' doesn't appear in dmesg.
>
Did you see 'video' driver from lsmod when you removed 'acpi_backlight=vendor'?
I traced your DSDT but didn't see strange thing on GFX0, it have _DOS and _DOD,
should be a video device.
If possible, please add the following kernel parameter then reboot machine:
acpi.debug_level=0x0000000F acpi.debug_layer=0xffffffff log_buf_len=5M
Please attach dmesg.log after system boot, there should have GFX0 wording in
log.
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