Created attachment 525892 [details] Xorg.0.log Description of problem: The desktop and any graphics with smooth transitions in shading, or gradients of colour appear banded or blocky. The problem is most obvious in this specialized test http://www.lagom.nl/lcd-test/gradient.php To fix this, dithering needs to be turned on manually using sudo xrandr --output eDP-1 --set dithering On Version-Release number of selected component (if applicable): xorg-x11-server-Xorg-1.10.4-1.fc15.x86_64 How reproducible: Always Steps to Reproduce: 1. Boot up laptop 2. log in 3. Browse to http://www.lagom.nl/lcd-test/gradient.php Actual results: The grey gradients are very obviously split into approximately 60 vertical bands. Expected results: The grey gradients should appear as a smooth transition from black to white (and vice versa) without having to apply the dithering setting manually. Additional info: Discovered source of the problem from the discussion started by mikc in this IRC log - http://people.freedesktop.org/~cbrill/dri-log/dri-devel-2010-03-04.log I'm not sure if this is the right bug report to make. Have I chosen the right package? Should I be filing upstream somewhere? Also, what other information is needed from my system so that future versions of Fedora don't require the dithering setting to be applied manually? Gnome 3's 'Displays' systems settings reports the display as a 'Seiko Epson Corporation 14"'. Below is the output of xrandr --verbose and attached are the Xorg logs (both captured prior to the dithering setting being applied manually). [root@myhost ~]# xrandr --verbose Screen 0: minimum 320 x 200, current 1440 x 900, maximum 8192 x 8192 eDP-1 connected 1440x900+0+0 (0x65) normal (normal left inverted right x axis y axis) 303mm x 190mm Identifier: 0x61 Timestamp: 41352 Subpixel: unknown Gamma: 1.0:1.0:1.0 Brightness: 1.0 Clones: CRTC: 0 CRTCs: 0 1 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: EDID: 00ffffffffffff004ca3425400000000 00140104951e13780a63168b5b579529 1e4f5400000001010101010101010101 0101010101011d2aa0e8518420302e46 99002fbe1000001a141ca0e851842030 2e4699002fbe1000001a000000fe0057 473430378131343142540a2000000000 00004101190000000009010a20200005 dithering: Off supported: Off On Automatic scaling mode: Full supported: None Full Center Full aspect 1440x900 (0x65) 107.8MHz +HSync -VSync *current +preferred h: width 1440 start 1486 end 1556 total 1928 skew 0 clock 55.9KHz v: height 900 start 909 end 918 total 932 clock 60.0Hz 1440x900 (0x66) 71.9MHz +HSync -VSync h: width 1440 start 1486 end 1556 total 1928 skew 0 clock 37.3KHz v: height 900 start 909 end 918 total 932 clock 40.0Hz 1152x864 (0x67) 81.8MHz -HSync +VSync h: width 1152 start 1216 end 1336 total 1520 skew 0 clock 53.8KHz v: height 864 start 867 end 871 total 897 clock 60.0Hz 1024x768 (0x68) 63.5MHz -HSync +VSync h: width 1024 start 1072 end 1176 total 1328 skew 0 clock 47.8KHz v: height 768 start 771 end 775 total 798 clock 59.9Hz 800x600 (0x69) 38.2MHz -HSync +VSync h: width 800 start 832 end 912 total 1024 skew 0 clock 37.4KHz v: height 600 start 603 end 607 total 624 clock 59.9Hz VGA-1 disconnected (normal left inverted right x axis y axis) Identifier: 0x62 Timestamp: 41352 Subpixel: unknown Clones: CRTCs: 0 1 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: scaling mode: None supported: None Full Center Full aspect DP-1 disconnected (normal left inverted right x axis y axis) Identifier: 0x63 Timestamp: 41352 Subpixel: unknown Clones: CRTCs: 0 1 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: dithering: Off supported: Off On Automatic scaling mode: Full supported: None Full Center Full aspect DP-2 disconnected (normal left inverted right x axis y axis) Identifier: 0x64 Timestamp: 41352 Subpixel: unknown Clones: CRTCs: 0 1 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: dithering: Off supported: Off On Automatic scaling mode: Full supported: None Full Center Full aspect [root@myhost ~]#
It looks like these bugreports at freedesktop.org are for the same thing. https://bugs.freedesktop.org/show_bug.cgi?id=26906 https://bugs.freedesktop.org/show_bug.cgi?id=33987 https://bugs.freedesktop.org/show_bug.cgi?id=34680 Switching this report to nouveau driver package.
This should be fixed upstream (where by upstream I mean nouveau git, not the linux kernel yet), and I'll backport the patches to F16 at some point. The changes are rather extensive, so it's unlikely they'll appear in F15.
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