Bug 483280 - Radeon XPRESS 200M (RC410) - Gamma setting in xorg.conf not honored unless nomodeset in kernel
Radeon XPRESS 200M (RC410) - Gamma setting in xorg.conf not honored unless no...
Product: Fedora
Classification: Fedora
Component: xorg-x11-drv-ati (Show other bugs)
i386 Linux
low Severity low
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Assigned To: Dave Airlie
Fedora Extras Quality Assurance
: Triaged
Depends On:
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Reported: 2009-01-30 12:22 EST by Alex Villacís Lasso
Modified: 2009-12-18 02:45 EST (History)
3 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Clone Of:
Last Closed: 2009-12-18 02:45:07 EST
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Attachments (Terms of Use)
Configuration file used for Xorg, with required gamma value. (1.56 KB, text/plain)
2009-01-30 12:22 EST, Alex Villacís Lasso
no flags Details
Output of lspci -v (5.09 KB, text/plain)
2009-01-30 12:23 EST, Alex Villacís Lasso
no flags Details

  None (edit)
Description Alex Villacís Lasso 2009-01-30 12:22:04 EST
Created attachment 330494 [details]
Configuration file used for Xorg, with required gamma value.

Description of problem:

My screen needs a gamma setting of 2.08 to show colors properly - otherwise the output is annoyingly dark. This gamma value is the one reported by EDID, from what I can glean in the X server log.

When using modesetting (the default case), the value gets picked up from the conf file and shown in the log, but is not actually applied - the graphical screen is still too dark. Also the xgamma command does not work at all, even though it reports that the gamma value is set to the correct value.

By adding "nomodeset" to the kernel command line, the xorg.conf value is correctly applied, and the xgamma command works. However, this also results in DRI disabled, so it is not a good workaround.

Version-Release number of selected component (if applicable):


How reproducible:

Steps to Reproduce:
1. Get a Radeon RC410 chipset to test
2. With kernel modesetting active, attempt to change gamma value (with xorg.conf or xgamma command)
Actual results:
Gamma value and/or execution of xgamma result in no visible change on the screen, even though values are correctly reported.

Expected results:
Gamma value should be immediately applied, regardless of the use of modesetting.

Additional info:
Workaround is to disable kernel modesetting on boot.
Comment 1 Alex Villacís Lasso 2009-01-30 12:23:13 EST
Created attachment 330495 [details]
Output of lspci -v
Comment 2 Callum Lerwick 2009-02-28 13:10:53 EST
I can confirm this on a Radeon 9600XT. Gamma does nothing no matter how you set it. This is a problem with Quake 3, it displays really, really dark and moving the in-game slider does nothing. Same hardware as in 487432
Comment 3 Alex Villacís Lasso 2009-04-03 19:04:01 EDT
Still present with:

Comment 4 Callum Lerwick 2009-05-20 23:49:48 EDT
Okay, as of:


... Gamma now seems to work. Sort of. The brightness slider in Quake 3 now works properly with modesetting enabled, but something weird has happened to the "xgamma" command line tool. Setting larger numbers makes the display *darker*, smaller numbers make it brighter. This is a change in previous behavior. I now have to set the gamma to 0.8 or so to get what I used to with 1.2. The gamma setting has become 1/gamma ? 1/1.2 comes out to 0.833333333...
Comment 5 cam 2009-06-01 03:53:22 EDT
I'm also seeing this problem with my Dell laptop (Radeon x300 card)
01:00.0 VGA compatible controller: ATI Technologies Inc M22 [Mobility Radeon X30
0] (prog-if 00 [VGA controller])
        Subsystem: Dell Device 2003
        Flags: bus master, fast devsel, latency 0, IRQ 16
        Memory at d0000000 (32-bit, prefetchable) [size=128M]
        I/O ports at de00 [size=256]
        Memory at dfdf0000 (32-bit, non-prefetchable) [size=64K]
        [virtual] Expansion ROM at dfd00000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel modules: radeon, radeonfb

xgamma appears to work but does not actually change the screen gamma. I would really like working gamma to be able to view photos properly (they all look too dark without it)
Comment 6 Bug Zapper 2009-11-18 07:44:57 EST
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Comment 7 Bug Zapper 2009-12-18 02:45:07 EST
Fedora 10 changed to end-of-life (EOL) status on 2009-12-17. Fedora 10 is 
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