From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 15166] Changing brightness of backlight freezes kernel with
radeon kms enabled.
Date: Tue, 9 Feb 2010 20:58:59 GMT
Message-ID: <201002092058.o19Kwxx8024135@demeter.kernel.org>
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http://bugzilla.kernel.org/show_bug.cgi?id=15166
--- Comment #22 from Manuel Ullmann 2010-02-09 20:58:17 ---
Created an attachment (id=24980)
--> (http://bugzilla.kernel.org/attachment.cgi?id=24980)
syslog-ng output of an isuue caused by BIOS.
@Alex Deucher:
You mentioned earlier some 'scratch reg bits'. What are they doing? How could
they fix issues specific to certain systems like the Compaq 6735b series?
Your patch at
http://people.freedesktop.org/~agd5f/0001-drm-radeon-kms-add-additional-safe-regs-for-r4xx-rs.patch
seems to be related to those bits, but it is specific to some graphic chips.
I have experienced, that waking up from S3 or S4 can indeed change the
brightness with kms. As mentioned in Comment 12, the brightness uninitialized
until it is changed. /sys/class/backlight/acpi_video?/backlight has the value
0, although the backlight has full brightness, which should be 24. When
hibernate-script reinitializes the backlight, it is switched to its lowest
brightness. So I can choose now between the highest and lowest brightness. But
nevertheless the main issue, that the system freezes after certain amount of
inactivity, remains.
I understand, that the firmware is not likely to be updated and that instead
the kernel framework around it maybe has to be fixed. Of course this could be
also BIOS-related, as I had already an issue, which was caused by an error in
BIOS with this notebook (see attachement). But as this Bug is not
OS-independent, I doubt that it would be fixed ever.
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