[Openchrome-devel] [Bug 93246] New: [Patch] OpenChrome LVDS DFP (LCD) Power Management Improvement

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri Dec 4 00:11:16 PST 2015


            Bug ID: 93246
           Summary: [Patch] OpenChrome LVDS DFP (LCD) Power Management
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: Driver/openchrome
          Assignee: openchrome-devel at lists.freedesktop.org
          Reporter: kevinbrace at gmx.com

Created attachment 120331
  --> https://bugs.freedesktop.org/attachment.cgi?id=120331&action=edit
A new function called VIASetDFPBackLight was added

This is a major improvement for those with DFP (Digital Flat Panel) like LCD,
especially laptop users (i.e., LVDS DFP) who happened to have VIA Technologies
integrated graphics.
In order to apply this patch, it is recommended to download 9 other patches I
have posted here, but at the minimum, you can "probably" get away with applying
a patch uploaded with Bug 93245 first before applying this one.
    For Ubuntu users (including Lubuntu and other variants), you should be
using 10.04 LTS or later versions.
As far as I know, OpenChrome does not compile with 8.04 LTS at this point.
Before compiling OpenChrome you need to install git-core.

    sudo apt-get install git-core

In order to compile OpenChrome successfully, you will need to build dependency
for xserver-xorg-video-openchrome.

    sudo apt-get build-dep xserver-xorg-video-openchrome

Download the current OpenChrome source code.

    git clone git://anongit.freedesktop.org/openchrome/xf86-video-openchrome

Change to the OpenChrome folder.

    cd xf86-video-openchrome

At a minimum, download this patch and the patch posted over at Bug 93245 to
xf86-video-openchrome holder.
It is recommended to download all 10 patches including this one to
xf86-video-openchrome holder.
Now apply the patch like the following way.

    patch -p1 < 0009-Made-improvements-to-ViaLVDSDFPPower-function-inside.patch
    patch -p1 < 0010-Added-a-new-function-called-VIASetDFPBackLight-to-vi.patch

For the other 8 earlier patches, just change the file name portion (*.patch
section) of the patch command.
Now prepare for compilation.

    ./autogen.sh --prefix=/usr --enable-debug --enable-xv-debug

Compile the source code.


If you do not care about overwriting the current OpenChrome device driver, then
you can proceed to installation.

    sudo make install

Now, reboot and hopefully OpenChrome works correctly with the updated code.
If you set the screen display turn off timer to, say 1 minute, then the DFP of
your laptop should turn off automatically in 1 minute.
Of course, the screen turns back on if you move the mouse cursor or press the
Please make sure that you specify the desired timer setting for both AC adapter
operation and battery operation.
Note that this patch only affects DFP, and it has no impact on VGA-based screen
(i.e., screen turn off feature already works correctly).
The source code compilation instructions were largely copied from the
OpenChrome installation page, especially "Install from GIT" section.


I hope the download, compilation, and installation instructions I provided is
useful, but if anyone needs more detailed instructions, I will try to help you
    Note that if you are using VX855 chipset, you probably should not install
the current iteration of OpenChrome since there was a user that reported a
fatal crash bug that has not been resolved at this point (Bug 91966).
Furthermore, for CLE266, KM400, KM400A, and P4M800 chipset users, it is not
recommended to install the current iteration of OpenChrome since cursor may not
get rendered at all on the screen.
I am still working on resolving both bugs at this point, along with resolving
ACPI S3 State resume bug.
Some of the patches I posted do improve the situation somewhat, but I still
have not figured out completely why the LVDS DFP screen does not come back


Kevin Brace

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