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): xorg-x11-server-Xorg-1.5.3-6.fc10.i386 xorg-x11-drv-ati-6.10.0-1.fc10.i386 mesa-libGL-7.2-0.15.fc10.i386 mesa-dri-drivers-7.2-0.15.fc10.i386 kernel-2.6.27.12-170.2.5.fc10.i686 How reproducible: Always 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.
Created attachment 330495 [details] Output of lspci -v
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
Still present with: xorg-x11-server-Xorg-1.5.3-15.fc10.i386 xorg-x11-drv-ati-6.10.0-2.fc10.i386 mesa-libGL-7.2-0.15.fc10.i386 mesa-dri-drivers-7.2-0.15.fc10.i386 kernel-2.6.27.21-170.2.56.fc10.i686
Okay, as of: xorg-x11-server-Xorg-1.6.1-11.fc11.x86_64 xorg-x11-drv-ati-6.12.2-14.fc11.x86_64 kernel-2.6.29.3-140.fc11.x86_64 ... 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...
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 xorg-x11-drv-ati-6.10.0-2.fc10.i386 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)
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