From: Michel Alexandre Salim <salimma@fedoraproject.org>
To: linux-acpi@vger.kernel.org,
platform-driver-x86 <platform-driver-x86@vger.kernel.org>
Cc: Mattia Dongili <malattia@linux.it>, Marco Chiappero <marco@absence.it>
Subject: Need help debugging Sony Vaio VPCY2 backlight control problem
Date: Fri, 01 Jul 2011 21:34:45 +0200 [thread overview]
Message-ID: <4E0E2155.4070508@fedoraproject.org> (raw)
Dear all,
(cc:ing Mattia and Marco since they seem to be actively working on
sony-laptop.ko)
I have a Sony Vaio VPCY2 with a backlight control problem -- both with
acpi_backlight=video and acpi_backlight=vendor.
With the former, setting the backlight (with Fn-F5/6) gave the
appearance, as far as
/sys/class/backlight/acpi_video0/{actual_,}brightness is concerned, that
the change took place, however, the screen brightness remained
unchanged. Even setpci-ing the hardware register does not make a difference.
Kernel bug report here: https://bugzilla.kernel.org/show_bug.cgi?id=38342
Fedora bug report: https://bugzilla.redhat.com/show_bug.cgi?id=689962
Is the Vaio Y's backlight supposed to be controlled by sony-laptop
instead of by video.ko? Right now with sony-laptop, actual_brightness
always reads -1 no matter what value is written to brightness.
If there's any information not currently attached to those bug reports
that is needed, please let me know.
Thanks in advance,
--
Michel Alexandre Salim
GPG key ID: 78884778
() ascii ribbon campaign - against html e-mail
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next reply other threads:[~2011-07-01 19:34 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-01 19:34 Michel Alexandre Salim [this message]
2011-07-01 22:12 ` Need help debugging Sony Vaio VPCY2 backlight control problem Marco Chiappero
2011-07-04 8:46 ` Michel Alexandre Salim
2011-07-04 8:48 ` Michel Alexandre Salim
2011-07-04 8:57 ` Zhang Rui
2011-07-04 11:31 ` Michel Alexandre Salim
2011-07-04 13:34 ` Michel Alexandre Salim
2011-07-13 12:51 ` Michel Alexandre Salim
2011-07-04 10:58 ` Marco Chiappero
2011-07-04 19:00 ` Michel Alexandre Salim
2011-07-04 19:51 ` Marco Chiappero
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