Bug 18264 - [915GM] backlight does not work in legacy mode
Summary: [915GM] backlight does not work in legacy mode
Status: VERIFIED NOTABUG
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
URL:
Whiteboard:
Keywords: NEEDINFO
Depends on:
Blocks:
 
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:


Attachments
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]
xorg.conf

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]
xorg.0.log
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.


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