Bug 10546

Created attachment 9503 [details]
Xorg.log

Created attachment 9504 [details]
xorg.conf

I assume this only happens with triple buffering as well as page flipping; I fixed a problem like this recently in Mesa git, which commit are you at?

I tested:
Mesa commit 51a894e6ebc3412a6d634a7378806f137374b09a
DRM commit 78034c06dfc0cd79cc47c2daa119ca3ee2a4fed4

Image flickers also with PageFlip enabled and TripleBuffer disabled.

I can't seem to reproduce this, but I just pushed some possibly related changes to git. If it still happens with current git, please attach the output of xrandr --verbose; with glxgears, does only the window flicker, or the whole screen?

Window flickers also with changes.

Screen 0: minimum 320 x 200, current 1024 x 768, maximum 1024 x 1024
VGA disconnected (normal left inverted right)
        Identifier: 0x5c
        Timestamp:  -784132709
        Subpixel:   unknown
        Clones:
        CRTCs:      0
LVDS connected 1024x768+0+0 normal (normal left inverted right) 304mm x 228mm
        Identifier: 0x5d
        Timestamp:  -784132709
        Subpixel:   horizontal rgb
        Clones:
        CRTC:       1
        CRTCs:      1
        EDID_DATA:
                00ffffffffffff0006af511700000000
                010e0102801e17780a12e59152528927
                24505400000001010101010101010101
                01010101010164190040410026301888
                360030e4100000180000000f00067708
                ff010f052e2dff053f01000000fe0041
                554f0a202020202020202020000000fe
                00423135305847303156370a20200085
        BACKLIGHT: 20780 (0x00000000) range:  (0,20780)
  1024x768 (0x5f)   65.0MHz
        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 (0x60)   40.0MHz
        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 (0x61)   25.2MHz
        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
TV disconnected (normal left inverted right)
        Identifier: 0x5e
        Timestamp:  -784132709
        Subpixel:   unknown
        Clones:
        CRTCs:      0 1
        BOTTOM: 37 (0x00000000) range:  (0,100)
        RIGHT: 46 (0x00000000) range:  (0,100)
        TOP: 36 (0x00000000) range:  (0,100)
        LEFT: 54 (0x00000000) range:  (0,100)
                TV_FORMAT: ????

Created attachment 9516 [details] [review]
Possible fix

Does this xf86-video-intel patch help?

No change.
There is warning:
patching file src/i830_dri.c
Hunk #1 succeeded at 1686 (offset -55 lines).

Created attachment 9519 [details] [review]
i915tex debugging patch

Please provide the stderr output of running a GL app with this Mesa patch applied.

libGL warning: 3D driver claims to not support visual 0x63
glxgears - Page flipping active, pf_pipes=0x2
Vsync to pipe B

Flicker seems to depend on app. In some games e.g. ActionCube, 
it flickers only once per 20 seconds.

Created attachment 9557 [details]
7.2.0 Xorg.log

glxgears stderr with xorg 7.2.0:
libGL warning: 3D driver claims to not support visual 0x5b
Vsync to pipe B

(In reply to comment #14)
> glxgears stderr with xorg 7.2.0:

Pre-1.9.9x versions of the 2D driver lie, they don't actually support page flipping.

It seems to be fixed.

Bug appeared again after connecting LCD to VGA output.

Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 1280 x 1280
VGA connected 1280x1024+0+0 normal (normal left inverted right) 338mm x 270mm
        Identifier: 0x5c
        Timestamp:  -2130392817
        Subpixel:   unknown
        Clones:
        CRTC:       0
        CRTCs:      0
        EDID_DATA:
                00ffffffffffff001e6d7444c8e10200
                031101036a221b78eaaec5a2574a9c25
                125054a56b80314f454f614f81800101
                010101010101302a009851002a403070
                1300520e1100001e000000fd00384b1e
                530e000a202020202020000000fc004c
                3137353348520a2020202020000000fc
                00200a202020202020202020202000d3
  1280x1024 (0x5f)  108.0MHz
        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
  1280x1024 (0x60)  109.0MHz
        h: width  1280 start 1368 end 1496 total 1712 skew    0 clock   63.7KHz
        v: height 1024 start 1027 end 1034 total 1063           clock   59.9Hz
  1024x768 (0x61)   65.0MHz
        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 (0x62)   40.0MHz
        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 (0x63)   25.2MHz
        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
LVDS connected 1024x768+0+0 normal (normal left inverted right) 304mm x 228mm
        Identifier: 0x5d
        Timestamp:  -2130392817
        Subpixel:   horizontal rgb
        Clones:
        CRTC:       1
        CRTCs:      1
        EDID_DATA:
                00ffffffffffff0006af511700000000
                010e0102801e17780a12e59152528927
                24505400000001010101010101010101
                01010101010164190040410026301888
                360030e4100000180000000f00067708
                ff010f052e2dff053f01000000fe0041
                554f0a202020202020202020000000fe
                00423135305847303156370a20200085
        BACKLIGHT: 20780 (0x00000000) range:  (0,20780)
  1024x768 (0x61)   65.0MHz
        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 (0x62)   40.0MHz
        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 (0x64)   25.2MHz
        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
TV disconnected (normal left inverted right)
        Identifier: 0x5e
        Timestamp:  -2130392817
        Subpixel:   unknown
        Clones:
        CRTCs:      0 1
        BOTTOM: 37 (0x00000000) range:  (0,100)
        RIGHT: 46 (0x00000000) range:  (0,100)
        TOP: 36 (0x00000000) range:  (0,100)
        LEFT: 54 (0x00000000) range:  (0,100)
                TV_FORMAT: ????

Created attachment 9945 [details]
Xorg.log

Created attachment 9946 [details]
xorg.conf

(In reply to comment #17)
> Bug appeared again after connecting LCD to VGA output.

Is the flicker (identical) on both outputs? Are you using sync-to-vblank?

I don't have access to external LCD at the moment.
Both images looked same except resolution, when I was testing.
I'm using following drirc file

<driconf>
    <device screen="0" driver="i915">
        <application name="Default">
            <option name="force_s3tc_enable" value="false" />
            <option name="fthrottle_mode" value="2" />
            <option name="vblank_mode" value="0" />
            <option name="allow_large_textures" value="1" />
        </application>
    </device>
    <device screen="0" driver="i915tex">
        <application name="Default">
            <option name="force_s3tc_enable" value="false" />
            <option name="fthrottle_mode" value="2" />
            <option name="vblank_mode" value="0" />
            <option name="allow_large_textures" value="1" />
        </application>
    </device>
</driconf>

I have external LCD connected. Image flickers same on both displays.

mesa 6.5.3
xorg-server 1.3.0
xf86-video-intel git 0984c1fc0963f1ebab31f5b8fce5ad4c387fbd2c
drm git 638c8087deecdf489eb4f70e82590d1be0c8c942

Created attachment 10155 [details]
Xorg.log

Created attachment 10156 [details]
kernel config

Image flickers also with mesa git 90630feeec52c6d4f2a17f75cdf3dab9f5baf923

Okay, I've been able to reproduce this. The problem occurs when Mesa generates damage events for buffer swaps and xf86-video-intel doesn't know to ignore them for synchronising the page contents. It'll be fixed when you build and run xf86-video-intel against xserver master (to become 1.4).