<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif">Thanks for the quick reply! </div><div class="gmail_default" style="font-family:verdana,sans-serif"></div><div class="gmail_default" style="font-family:verdana,sans-serif"> Yes. It means that HDMI black level is detected incorrectly. </div><div class="gmail_default" style="font-family:verdana,sans-serif">Setting "HDMI black level" from the monitor is not a reasonable solution for me since I dual boot with windows and I need to set it back again. Also I will lose about 10% color space. xrandr solution will cause a screen flicker. Both of them is not the perfect to me. So I can only fall back to kernel 3.4.x series. </div><div class="gmail_default" style="font-family:verdana,sans-serif">Also I found that Broadcast_RGB option in xorg.conf is useless for me. Here is the setting. Section "Monitor" Identifier "HDMI1" Option "BROADCAST_RGB" "0" Option "PreferredMode" "1920x1080" EndSection </div><div class="gmail_default" style="font-family:verdana,sans-serif"> </div><div class="gmail_default" style="font-family:verdana,sans-serif">One problem is that it is much more hard to modify hardware (or its firmware) than software. I'm not familiar in driver development so I cannot say whether the implementation of automatic detection is good or not. But the price of keeping the standard may be too high. I don't know if how much systems are affected since this problem is a little latent. Hope this problem can be finally solved or workaround ;) </div><div class="gmail_extra"> <div class="gmail_quote">On Wed, Sep 4, 2013 at 9:52 PM, Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com" target="_blank">ville.syrjala@linux.intel.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Wed, Sep 04, 2013 at 09:23:36PM +0800, Yichao Zhou wrote: > Hello, Ville Syrjälä Hi. Please always cc the intel-gfx mailing list when reporting issues. I'm doing that now. <div class="im"> > It seems that the patch you submitting on > <a href="https://patchwork.kernel.org/patch/1972181/" target="_blank">https://patchwork.kernel.org/patch/1972181/</a> broke my system, which has a > monitor S24B370. </div>What do you mean "broke"? Do you still get the picture but the quantization range is different than it was before? <div class="im">> > Execute --output <HDMI> --set "Broadcast RGB" "Full" solve the problem, > which the cost that the screen will flick for a second. </div>This is one way to fix it, the other is to change it in the TV itself. It's usually called "HDMI black level" or something similar. Unfortunately TV manufacturers are bad at implementing standards, so there's no sane default value we can pick. The best we can do is follow the standard and hope TV manufacturers get their act together eventually. <div class=""><div class="h5"> > > See <a href="https://wiki.archlinux.org/index.php/Intel_Graphics" target="_blank">https://wiki.archlinux.org/index.php/Intel_Graphics</a> for more detail > and I'm glad to provide more details. > > Here is xrandr --verbose. My system runs a hybrid system with ATI 5770 on > two monitors, one of which is my laptop's LVDS and the other is S24B370 > with HDMI. > > Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192 > LVDS1 connected 1024x768+0+0 (0x47) normal (normal left inverted right x > axis y axis) 309mm x 173mm > Identifier: 0x41 > Timestamp: 31910 > Subpixel: horizontal rgb > 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: > 00ffffffffffff0006af3c3001000000 > 01130103801f11780ac8a59e57549226 > 99505400000001010101010101010101 > 010101010101121b5646500023302616 > 360035ad100000180000000f00000000 > 00000000000000000020000000fe0041 > 554f0a202020202020202020000000fe > 004231343058573033205630200a0004 > BACKLIGHT: 7 (0x00000007) range: (0,7) > Backlight: 7 (0x00000007) range: (0,7) > scaling mode: Full aspect > supported: None Full Center Full > aspect > 1366x768 (0x46) 69.3MHz -HSync -VSync +preferred > h: width 1366 start 1404 end 1426 total 1436 skew 0 clock > 48.3KHz > v: height 768 start 771 end 777 total 803 clock > 60.1Hz > 1024x768 (0x47) 65.0MHz -HSync -VSync *current > h: width 1024 start 1048 end 1184 total 1344 skew 0 clock > 48.4KHz > v: height 768 start 771 end 777 total 806 clock > 60.0Hz > 800x600 (0x48) 40.0MHz +HSync +VSync > h: width 800 start 840 end 968 total 1056 skew 0 clock > 37.9KHz > v: height 600 start 601 end 605 total 628 clock > 60.3Hz > 800x600 (0x49) 36.0MHz +HSync +VSync > h: width 800 start 824 end 896 total 1024 skew 0 clock > 35.2KHz > v: height 600 start 601 end 603 total 625 clock > 56.2Hz > 640x480 (0x4a) 25.2MHz -HSync -VSync > h: width 640 start 656 end 752 total 800 skew 0 clock > 31.5KHz > v: height 480 start 490 end 492 total 525 clock > 59.9Hz > VGA1 disconnected (normal left inverted right x axis y axis) > Identifier: 0x42 > Timestamp: 31910 > 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: > HDMI1 connected 1920x1080+0+0 (0x4b) normal (normal left inverted right x > axis y axis) 531mm x 299mm > Identifier: 0x43 > Timestamp: 31910 > Subpixel: unknown > Gamma: 1.0:1.0:1.0 > Brightness: 1.0 > Clones: > CRTC: 1 > CRTCs: 0 1 > Transform: 1.000000 0.000000 0.000000 > 0.000000 1.000000 0.000000 > 0.000000 0.000000 1.000000 > filter: > EDID: > 00ffffffffffff004c2dde085731555a > 1016010380351e782aba41a159559d28 > 0d5054bfef80714f81c0810081809500 > a9c0b3000101023a801871382d40582c > 4500132b2100001e011d007251d01e20 > 6e285500132b2100001e000000fd0032 > 4b1e5111000a202020202020000000fc > 00533234423337300a20202020200126 > 020311b14690041f13120365030c0010 > 00011d00bc52d01e20b8285540132b21 > 00001e8c0ad090204031200c40550013 > 2b210000188c0ad08a20e02d10103e96 > 00132b21000018000000000000000000 > 00000000000000000000000000000000 > 00000000000000000000000000000000 > 00000000000000000000000000000021 > Broadcast RGB: Full > supported: Automatic Full Limited 16:2 > audio: auto > supported: force-dvi off auto > on > 1920x1080 (0x4b) 148.5MHz +HSync +VSync *current +preferred > h: width 1920 start 2008 end 2052 total 2200 skew 0 clock > 67.5KHz > v: height 1080 start 1084 end 1089 total 1125 clock > 60.0Hz > 1920x1080 (0x4c) 148.5MHz +HSync +VSync > h: width 1920 start 2448 end 2492 total 2640 skew 0 clock > 56.2KHz > v: height 1080 start 1084 end 1089 total 1125 clock > 50.0Hz > 1680x1050 (0x4d) 119.0MHz +HSync -VSync > h: width 1680 start 1728 end 1760 total 1840 skew 0 clock > 64.7KHz > v: height 1050 start 1053 end 1059 total 1080 clock > 59.9Hz > 1600x900 (0x4e) 119.0MHz -HSync +VSync > h: width 1600 start 1696 end 1864 total 2128 skew 0 clock > 55.9KHz > v: height 900 start 901 end 904 total 932 clock > 60.0Hz > 1280x1024 (0x4f) 135.0MHz +HSync +VSync > h: width 1280 start 1296 end 1440 total 1688 skew 0 clock > 80.0KHz > v: height 1024 start 1025 end 1028 total 1066 clock > 75.0Hz > 1280x1024 (0x50) 108.0MHz +HSync +VSync > h: width 1280 start 1328 end 1440 total 1688 skew 0 clock > 64.0KHz > v: height 1024 start 1025 end 1028 total 1066 clock > 60.0Hz > 1440x900 (0x51) 88.8MHz +HSync -VSync > h: width 1440 start 1488 end 1520 total 1600 skew 0 clock > 55.5KHz > v: height 900 start 903 end 909 total 926 clock > 59.9Hz > 1280x800 (0x52) 71.0MHz +HSync -VSync > h: width 1280 start 1328 end 1360 total 1440 skew 0 clock > 49.3KHz > v: height 800 start 803 end 809 total 823 clock > 59.9Hz > 1152x864 (0x53) 108.0MHz +HSync +VSync > h: width 1152 start 1216 end 1344 total 1600 skew 0 clock > 67.5KHz > v: height 864 start 865 end 868 total 900 clock > 75.0Hz > 1280x720 (0x54) 74.2MHz +HSync +VSync > h: width 1280 start 1720 end 1760 total 1980 skew 0 clock > 37.5KHz > v: height 720 start 725 end 730 total 750 clock > 50.0Hz > 1280x720 (0x55) 74.2MHz +HSync +VSync > h: width 1280 start 1390 end 1430 total 1650 skew 0 clock > 45.0KHz > v: height 720 start 725 end 730 total 750 clock > 60.0Hz > 1024x768 (0x56) 78.8MHz +HSync +VSync > h: width 1024 start 1040 end 1136 total 1312 skew 0 clock > 60.1KHz > v: height 768 start 769 end 772 total 800 clock > 75.1Hz > 1024x768 (0x57) 75.0MHz -HSync -VSync > h: width 1024 start 1048 end 1184 total 1328 skew 0 clock > 56.5KHz > v: height 768 start 771 end 777 total 806 clock > 70.1Hz > 1024x768 (0x47) 65.0MHz -HSync -VSync > h: width 1024 start 1048 end 1184 total 1344 skew 0 clock > 48.4KHz > v: height 768 start 771 end 777 total 806 clock > 60.0Hz > 832x624 (0x58) 57.3MHz -HSync -VSync > h: width 832 start 864 end 928 total 1152 skew 0 clock > 49.7KHz > v: height 624 start 625 end 628 total 667 clock > 74.6Hz > 800x600 (0x59) 50.0MHz +HSync +VSync > h: width 800 start 856 end 976 total 1040 skew 0 clock > 48.1KHz > v: height 600 start 637 end 643 total 666 clock > 72.2Hz > 800x600 (0x5a) 49.5MHz +HSync +VSync > h: width 800 start 816 end 896 total 1056 skew 0 clock > 46.9KHz > v: height 600 start 601 end 604 total 625 clock > 75.0Hz > 800x600 (0x48) 40.0MHz +HSync +VSync > h: width 800 start 840 end 968 total 1056 skew 0 clock > 37.9KHz > v: height 600 start 601 end 605 total 628 clock > 60.3Hz > 800x600 (0x49) 36.0MHz +HSync +VSync > h: width 800 start 824 end 896 total 1024 skew 0 clock > 35.2KHz > v: height 600 start 601 end 603 total 625 clock > 56.2Hz > 720x576 (0x5b) 27.0MHz -HSync -VSync > h: width 720 start 732 end 796 total 864 skew 0 clock > 31.2KHz > v: height 576 start 581 end 586 total 625 clock > 50.0Hz > 720x480 (0x5c) 27.0MHz -HSync -VSync > h: width 720 start 736 end 798 total 858 skew 0 clock > 31.5KHz > v: height 480 start 489 end 495 total 525 clock > 59.9Hz > 640x480 (0x5d) 31.5MHz -HSync -VSync > h: width 640 start 664 end 704 total 832 skew 0 clock > 37.9KHz > v: height 480 start 489 end 491 total 520 clock > 72.8Hz > 640x480 (0x5e) 31.5MHz -HSync -VSync > h: width 640 start 656 end 720 total 840 skew 0 clock > 37.5KHz > v: height 480 start 481 end 484 total 500 clock > 75.0Hz > 640x480 (0x5f) 30.2MHz -HSync -VSync > h: width 640 start 704 end 768 total 864 skew 0 clock > 35.0KHz > v: height 480 start 483 end 486 total 525 clock > 66.7Hz > 640x480 (0x60) 25.2MHz -HSync -VSync > h: width 640 start 656 end 752 total 800 skew 0 clock > 31.5KHz > v: height 480 start 490 end 492 total 525 clock > 60.0Hz > 720x400 (0x61) 28.3MHz -HSync +VSync > h: width 720 start 738 end 846 total 900 skew 0 clock > 31.5KHz > v: height 400 start 412 end 414 total 449 clock > 70.1Hz > DP1 disconnected (normal left inverted right x axis y axis) > Identifier: 0x44 > Timestamp: 31910 > 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: > Broadcast RGB: Automatic > supported: Automatic Full Limited 16:2 > audio: auto > supported: force-dvi off auto on > > Regards, > Yichao Zhou. </div></div>-- Ville Syrjälä Intel OTC </blockquote></div> 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