[Bug 83021] New: Brightness is automatically set to zero when switching from X session to tty
bugzilla-daemon at bugzilla.kernel.org
bugzilla-daemon at bugzilla.kernel.org
Fri Aug 22 07:40:51 PDT 2014
https://bugzilla.kernel.org/show_bug.cgi?id=83021
Bug ID: 83021
Summary: Brightness is automatically set to zero when switching
from X session to tty
Product: Drivers
Version: 2.5
Kernel Version: 3.17-rc1
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Video(DRI - Intel)
Assignee: intel-gfx-bugs at lists.freedesktop.org
Reporter: gabriele.mzt at gmail.com
CC: intel-gfx-bugs at lists.freedesktop.org
Regression: No
Switching from my X session to tty* sets actual_screen backlight to 0 even
though brightness is not changed and is equal to max_brightness. Writing again
the value of max_brightness to brightness immediately raises the screen
backlight to the right value.
On boot, the brightness is correct until an X session is started.
The cause is 6dda730e55f412a6dfb181cae6784822ba463847 (drm/i915: respect the
VBT minimum backlight brightness), reverting it fixes the problem.
lspci:
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated
Graphics Controller (rev 09)
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