It appears I was confused and most recent testing _did_ happen in the
same session post-reboot, see timestamps in log snippet below;
The bug recurs after the display goes to DPMS standby/sleep. It also
appears the "display corruption on switching modes" occurs after the
display has its first (or multiple) chances to sleep as I hit it now
flipping to 1280x720 the second time in the session - no more clear
1280x720, again a wait for a garbled screen to revert.
While Xorg log shows the machine rereading DDC/EDID data when things are
woken out of DPMS (and the seizure-inducing flicker recommences), xrandr
shows _no_ difference in modelines before/after... not really a surprise
but was worth confirming.
[I should probably be hunting this bug upstream where it's probably
already fixed; maybe another night.]
[ 718.155] (II) RADEON(0): Allocate new frame buffer 1280x720 stride 1280
[ 718.155] (II) RADEON(0): VRAM usage limit set to 48193K
[ 748.647] (II) RADEON(0): Allocate new frame buffer 1920x1088 stride 1920
[ 748.692] (II) RADEON(0): VRAM usage limit set to 44089K
[ 1528.849] (II) RADEON(0): EDID vendor "HWP", prod id 12294
[ 1528.849] (II) RADEON(0): Using hsync ranges from config file
[ 1528.849] (II) RADEON(0): Using vrefresh ranges from config file
[ 1528.849] (II) RADEON(0): Printing DDC gathered Modelines:
...
[ 27408.170] (II) RADEON(0): Allocate new frame buffer 1280x720 stride 1280
[ 27408.171] (II) RADEON(0): VRAM usage limit set to 48193K
[ 27415.531] (II) RADEON(0): Allocate new frame buffer 1920x1088 stride 1920
[ 27415.576] (II) RADEON(0): VRAM usage limit set to 44089K
[ 30534.725] (II) RADEON(0): EDID vendor "HWP", prod id 12294
[ 30534.734] (II) RADEON(0): Using hsync ranges from config file
[ 30534.734] (II) RADEON(0): Using vrefresh ranges from config file
[ 30534.734] (II) RADEON(0): Printing DDC gathered Modelines:
[ 30534.734] (II) RADEON(0): Modeline "1920x1080"x0.0 148.50 1920 2008 2052
2200 1080 1084 1089 1125 +hsync +vsync (67.5 kHz eP)
[ 30534.734] (II) RADEON(0): Modeline "800x600"x0.0 40.00 800 840 968 1056
600 601 605 628 +hsync +vsync (37.9 kHz e)
[ 30534.734] (II) RADEON(0): Modeline "640x480"x0.0 25.18 640 656 752 800
480 490 492 525 -hsync -vsync (31.5 kHz e)
[ 30534.734] (II) RADEON(0): Modeline "720x400"x0.0 28.32 720 738 846 900
400 412 414 449 -hsync +vsync (31.5 kHz e)
[ 30534.734] (II) RADEON(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184
1344 768 771 777 806 -hsync -vsync (48.4 kHz e)
[ 30534.734] (II) RADEON(0): Modeline "1280x720"x60.0 74.48 1280 1336 1472
1664 720 721 724 746 -hsync +vsync (44.8 kHz e)
[ 30534.734] (II) RADEON(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440
1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[ 30534.734] (II) RADEON(0): Modeline "1440x900"x0.0 106.50 1440 1520 1672
1904 900 903 909 934 -hsync +vsync (55.9 kHz e)
[ 30534.735] (II) RADEON(0): Modeline "1680x1050"x0.0 146.25 1680 1784 1960
2240 1050 1053 1059 1089 -hsync +vsync (65.3 kHz e)
[ 30534.735] (II) RADEON(0): Modeline "1920x1080"x60.0 172.80 1920 2040 2248
2576 1080 1081 1084 1118 -hsync +vsync (67.1 kHz e)
===
While flickering:
---
xrandr -q --verbose
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 4096 x 4096
VGA-0 connected 1920x1080+0+0 (0x53) normal (normal left inverted right x axis
y axis) 510mm x 287mm
Identifier: 0x51
Timestamp: 27407961
Subpixel: no subpixels
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:
00ffffffffffff0022f0063001010101
1216010368331d782e77c5a3544f9f27
115054a1080081c081809500b300d1c0
010101010101023a801871382d40582c
4500fe1f1100001e000000fd00324c18
5e14000a202020202020000000fc0048
50204c56323331310a202020000000ff
0036434d323138305a43510a2020004c
load detection: 1 (0x00000001) range: (0,1)
1920x1080 (0x53) 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
1680x1050 (0x54) 146.2MHz -HSync +VSync
h: width 1680 start 1784 end 1960 total 2240 skew 0 clock 65.3KHz
v: height 1050 start 1053 end 1059 total 1089 clock 60.0Hz
1280x1024 (0x55) 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 (0x56) 106.5MHz -HSync +VSync
h: width 1440 start 1520 end 1672 total 1904 skew 0 clock 55.9KHz
v: height 900 start 903 end 909 total 934 clock 59.9Hz
1280x720 (0x57) 74.4MHz -HSync +VSync
h: width 1280 start 1336 end 1472 total 1664 skew 0 clock 44.7KHz
v: height 720 start 721 end 724 total 746 clock 60.0Hz
1024x768 (0x58) 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
800x600 (0x59) 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
640x480 (0x5a) 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 (0x5b) 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
===
Immediately after modeflip via Displays 'workaround' - diff shows no change
except timestamp:
---
xrandr -q --verbose
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 4096 x 4096
VGA-0 connected 1920x1080+0+0 (0x53) normal (normal left inverted right x axis
y axis) 510mm x 287mm
Identifier: 0x51
Timestamp: 31879702
Subpixel: no subpixels
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:
00ffffffffffff0022f0063001010101
1216010368331d782e77c5a3544f9f27
115054a1080081c081809500b300d1c0
010101010101023a801871382d40582c
4500fe1f1100001e000000fd00324c18
5e14000a202020202020000000fc0048
50204c56323331310a202020000000ff
0036434d323138305a43510a2020004c
load detection: 1 (0x00000001) range: (0,1)
1920x1080 (0x53) 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
1680x1050 (0x54) 146.2MHz -HSync +VSync
h: width 1680 start 1784 end 1960 total 2240 skew 0 clock 65.3KHz
v: height 1050 start 1053 end 1059 total 1089 clock 60.0Hz
1280x1024 (0x55) 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 (0x56) 106.5MHz -HSync +VSync
h: width 1440 start 1520 end 1672 total 1904 skew 0 clock 55.9KHz
v: height 900 start 903 end 909 total 934 clock 59.9Hz
1280x720 (0x57) 74.4MHz -HSync +VSync
h: width 1280 start 1336 end 1472 total 1664 skew 0 clock 44.7KHz
v: height 720 start 721 end 724 total 746 clock 60.0Hz
1024x768 (0x58) 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
800x600 (0x59) 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
640x480 (0x5a) 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 (0x5b) 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
--
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https://bugs.launchpad.net/bugs/1181355
Title:
R300 (RS480): Intermittent flickering corruption top half of display
(VGA, 1080p)
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