[Bug 27478] New: Radeon gamma bug, display too bright when using DVI-VGA adapter

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27478

           Summary: Radeon gamma bug, display too bright when using
                    DVI-VGA adapter
           Product: xorg
           Version: 7.4
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: high
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: bryce at canonical.com
         QAContact: xorg-team at lists.x.org


Forwarding this bug from Ubuntu reporter raido357:
http://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/548709

[Problem]
Several reporters confirm that the screen is too bright after upgrading from
karmic.

[Original Description]
Ubuntu Lucid Lynx radeon driver has a bug, which causes
gamma/contrast/brightness settings to be messed up.  Too bright, text boxs
disappear on forms, it's like sun shining directly on display. Just hard to see
things.  Menu bars or all melted to one, because of brightness.

http://ubuntuforums.org/showthread.php?t=1438810

Display is okay with Karmic Koala kernel 2.6.31-20.

Using xgamma, to lower gamma makes it worse.

My display has DVI and VGA inputs. I am using DVI->VGA adapter for ANALOG input
for my monitor. The ANALOG input is too bright, like described above.

If switch to DVI, then colors/brightness/gamma are fine.

So the problem is with ANALOG output from VGA.

I tried with different DVI->VGA converter, same issue - too bright display.

I can't switch permanently to DVI, because I need DVI for other machine with
HDMI->DVI adapter.

 To clarify the bug, I have added camera photos using identical manual settings
of the screens from Lucid (radeon) and karmic (flgrx). Note that all images are
of the same bootchart file. The images are as follows:
2149: Lucid with default settings (1.0)
2150: Lucid with xgamma set to .6
2151: Karmic with default settings (1.0)
2152: karmic with xgamma set to .6

Notice the loss of shading and detail in the Lucid shots easily seen on the
init and collector rows. Although the bug may seem trivial it does affect the
usability of Lucid a good deal. Please consider this a serious bug.
For additional information I use a desktop pc with an xfx radeon hd 4770 and
additional info can be seen in the bootchart photos.

Another user with HD 4350 reports seeing the same behavior, also using a
DVI-VGA adaptor.  Another on RV100 says they see similar symptoms and are using
the analog (d-sub) connector.  A user on HD3450 sees the same, also with a
DVI-VGA adapter.



Architecture: i386
Date: Fri Mar 26 12:50:34 2010
DistroRelease: Ubuntu 10.04
DkmsStatus: Error: [Errno 2] No such file or directory
Package: xserver-xorg-video-ati 1:6.12.191-1ubuntu2
ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.32-17-generic
root=UUID=f3621de2-2969-49d4-bdd3-882dee6a5df0 ro quiet splash
ProcEnviron:
 LANG=et_EE.UTF-8ProcVersionSignature: Ubuntu 2.6.32-17.26-generic
2.6.32.10+drm33.1
SourcePackage: xserver-xorg-video-ati
Uname: Linux 2.6.32-17-generic i686
dmi.bios.date: 06/05/2008
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F7c
dmi.board.name: 945P-S3
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.modalias:
dmi:bvnAwardSoftwareInternational,Inc.:bvrF7c:bd06/05/2008:svn:pn:pvr:rvnGigabyteTechnologyCo.,Ltd.:rn945P-S3:rvrx.x:cvn:ct3:cvr:
system: codename:           lucid
 architecture:       i686
 kernel:             2.6.32-17-generic

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