Bug 18264 - [915GM] backlight does not work in legacy mode
Summary: [915GM] backlight does not work in legacy mode
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/intel (show other bugs)
Version: git
Hardware: Other Linux (All)
: medium normal
Assignee: Jesse Barnes
QA Contact: Xorg Project Team
Keywords: NEEDINFO
Depends on:
Reported: 2008-10-28 02:24 UTC by zhao jian
Modified: 2009-03-11 00:55 UTC (History)
0 users

See Also:
i915 platform:
i915 features:

xorg.conf (3.26 KB, text/plain)
2008-10-28 02:24 UTC, zhao jian
no flags Details
xorg.0.log (416.71 KB, application/octet-stream)
2008-10-28 02:24 UTC, zhao jian
no flags Details

Description zhao jian 2008-10-28 02:24:04 UTC
Created attachment 19905 [details]

System Environment:
platform: 915GM (Thinkpad R52) 
xserver: 1.5 branch(ec5046ca7565e2364f42606b26159520a73dd207)
2D driver: master branch(87ea531c5dc5b39809395b277c330854aaaaf019)
kernel: drm-intel-next (43f7ccc48dd7587983cfe16de578042a7ad3a9b3)
lIBDRM : master branch (e47ab7a5081e178bad385ce2e75b01474ea7aa4c)

Bug detailed description:
on 915GM, the default BACKLIGHT_CONTROL mode is "kernel", and it works well.
But when I changed it to "legacy" mode, I changed the BACKLIGHT. It will changed in the information in "xrandr --prop"(shown in following), but the screen doesn't change accordingly and the the actual brightness is always 0.

[root@x-915gm drm-intel]# xrandr --prop
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 2048 x 2048
VGA disconnected (normal left inverted right x axis y axis)
LVDS connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
        PANEL_FITTING: center
                supported: center       full_aspect  full
        BACKLIGHT_CONTROL: legacy
                supported: native       legacy       combination  kernel
        BACKLIGHT: 254 (0x000000fe) range:  (0,255)
   1024x768       60.0*+   85.0     75.0     70.1     60.0
   832x624        74.6
   800x600        85.1     72.2     75.0     60.3     56.2
   640x480        85.0     72.8     75.0     59.9
   720x400        85.0
   640x400        85.1
   640x350        85.1
Comment 1 zhao jian 2008-10-28 02:24:44 UTC
Created attachment 19906 [details]
Comment 2 Jesse Barnes 2008-11-04 17:21:54 UTC
Do you have some reason to expect the legacy mode to work?  It won't necessarily be wired up on all platforms, so this might not be a bug...
Comment 3 Jesse Barnes 2008-11-11 13:00:21 UTC
Based on our discussions offline I'm going to mark this one as notabug.

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.