Bug 23463

Summary: Can't display non-native resolutions on Acer X234w displays connected to DVI
Product: xorg Reporter: Bernhard Rosenkraenzer <bero>
Component: Driver/intelAssignee: ykzhao <yakui.zhao>
Status: RESOLVED DUPLICATE QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium CC: michael.fu
Version: unspecifiedKeywords: NEEDINFO
Hardware: All   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
intel_reg_dumper output while in 1024x768 none

Description Bernhard Rosenkraenzer 2009-08-22 09:47:43 UTC 
When connecting an Acer X234w display to a 82Q35 graphics chip (8086:29b2, subsystem 8086:4f4a, rev 02) using the DVI connector, the native resolution of 1920x1200 works perfectly, but switching to any lower resolution such as 1024x768 results in the screen displaying the error message "Input not supported" (the error message is produced by the screen's firmware, not by any application running on the box).

Log files etc. don't display anything unusual, Xorg seems to think everything is working fine even at the lower resolution.

With ModeDebug enabled, this is what Xorg says about supported modes and EDID:

(II) intel(0): EDID for output VGA1
(II) intel(0): EDID for output DVI1
(II) intel(0): Manufacturer: ACR  Model: 0  Serial#: 1955596759
(II) intel(0): Year: 2007  Week: 49
(II) intel(0): EDID Version: 1.3
(II) intel(0): Digital Display Input
(II) intel(0): Max Image Size [cm]: horiz.: 52  vert.: 32
(II) intel(0): Gamma: 2.20
(II) intel(0): DPMS capabilities: Off
(II) intel(0): Supported color encodings: RGB 4:4:4 YCrCb 4:4:4
(II) intel(0): First detailed timing is preferred mode
(II) intel(0): redX: 0.640 redY: 0.330   greenX: 0.300 greenY: 0.608
(II) intel(0): blueX: 0.150 blueY: 0.060   whiteX: 0.313 whiteY: 0.329
(II) intel(0): Supported VESA Video Modes:
(II) intel(0): 720x400@70Hz
(II) intel(0): 640x480@60Hz
(II) intel(0): 640x480@75Hz
(II) intel(0): 800x600@60Hz
(II) intel(0): 800x600@75Hz
(II) intel(0): 1024x768@60Hz
(II) intel(0): 1024x768@75Hz
(II) intel(0): 1280x1024@75Hz
(II) intel(0): Manufacturer's mask: 0
(II) intel(0): Supported Future Video Modes:
(II) intel(0): #0: hsize: 1280  vsize 1024  refresh: 60  vid: 32897
(II) intel(0): #1: hsize: 1280  vsize 800  refresh: 60  vid: 129
(II) intel(0): #2: hsize: 1280  vsize 800  refresh: 75  vid: 3969
(II) intel(0): #3: hsize: 1440  vsize 900  refresh: 60  vid: 149
(II) intel(0): #4: hsize: 1440  vsize 900  refresh: 75  vid: 3989
(II) intel(0): #5: hsize: 1600  vsize 1200  refresh: 60  vid: 16553
(II) intel(0): #6: hsize: 1680  vsize 1050  refresh: 60  vid: 179
(II) intel(0): Supported additional Video Mode:
(II) intel(0): clock: 154.0 MHz   Image Size:  518 x 324 mm
(II) intel(0): h_active: 1920  h_sync: 1968  h_sync_end 2000 h_blank_end 2080 h_border: 0
(II) intel(0): v_active: 1200  v_sync: 1203  v_sync_end 1209 v_blanking: 1235 v_border: 0
(II) intel(0): Ranges: V min: 56 V max: 76 Hz, H min: 30 H max: 82 kHz, PixClock max 170 MHz
(II) intel(0): Monitor name: Acer X243W
(II) intel(0): Serial No: LAG040047210
(II) intel(0): EDID (in hex):
(II) intel(0):  00ffffffffffff0004720000d7099074
(II) intel(0):  31110103803420782aef95a3544c9b26
(II) intel(0):  0f5054a54b0081808100810f9500950f
(II) intel(0):  a940b3000101283c80a070b023403020
(II) intel(0):  360006442100001a000000fd00384c1e
(II) intel(0):  5211000a202020202020000000fc0041
(II) intel(0):  6365722058323433570a2020000000ff
(II) intel(0):  004c41473034303034373231300a0036
(II) intel(0): EDID vendor "ACR", prod id 0
(II) intel(0): Using hsync ranges from config file
(II) intel(0): Using vrefresh ranges from config file
(II) intel(0): Printing DDC gathered Modelines:
(II) intel(0): Modeline "1920x1200"x0.0  154.00  1920 1968 2000 2080  1200 1203 1209 1235 +hsync -vsync (74.0 kHz)
(II) intel(0): Modeline "800x600"x0.0   40.00  800 840 968 1056  600 601 605 628 +hsync +vsync (37.9 kHz)
(II) intel(0): Modeline "640x480"x0.0   31.50  640 656 720 840  480 481 484 500 -hsync -vsync (37.5 kHz)
(II) intel(0): Modeline "640x480"x0.0   25.18  640 656 752 800  480 490 492 525 -hsync -vsync (31.5 kHz)
(II) intel(0): Modeline "720x400"x0.0   28.32  720 738 846 900  400 412 414 449 -hsync +vsync (31.5 kHz)
(II) intel(0): Modeline "1280x1024"x0.0  135.00  1280 1296 1440 1688  1024 1025 1028 1066 +hsync +vsync (80.0 kHz)
(II) intel(0): Modeline "1024x768"x0.0   78.75  1024 1040 1136 1312  768 769 772 800 +hsync +vsync (60.0 kHz)
(II) intel(0): Modeline "1024x768"x0.0   65.00  1024 1048 1184 1344  768 771 777 806 -hsync -vsync (48.4 kHz)
(II) intel(0): Modeline "800x600"x0.0   49.50  800 816 896 1056  600 601 604 625 +hsync +vsync (46.9 kHz)
(II) intel(0): Modeline "1280x1024"x0.0  108.00  1280 1328 1440 1688  1024 1025 1028 1066 +hsync +vsync (64.0 kHz)
(II) intel(0): Modeline "1280x800"x0.0   71.00  1280 1328 1360 1440  800 803 809 823 +hsync -vsync (49.3 kHz)
(II) intel(0): Modeline "1280x800"x0.0  106.50  1280 1360 1488 1696  800 803 809 838 -hsync +vsync (62.8 kHz)
(II) intel(0): Modeline "1440x900"x0.0   88.75  1440 1488 1520 1600  900 903 909 926 +hsync -vsync (55.5 kHz)
(II) intel(0): Modeline "1440x900"x0.0  136.75  1440 1536 1688 1936  900 903 909 942 -hsync +vsync (70.6 kHz)
(II) intel(0): Modeline "1600x1200"x0.0  162.00  1600 1664 1856 2160  1200 1201 1204 1250 +hsync +vsync (75.0 kHz)
(II) intel(0): Modeline "1680x1050"x0.0  119.00  1680 1728 1760 1840  1050 1053 1059 1080 +hsync -vsync (64.7 kHz)
(II) intel(0): Printing probed modes for output DVI1
(II) intel(0): Modeline "1920x1200"x60.0  154.00  1920 1968 2000 2080  1200 1203 1209 1235 +hsync -vsync (74.0 kHz)
(II) intel(0): Modeline "1280x1024"x75.0  135.00  1280 1296 1440 1688  1024 1025 1028 1066 +hsync +vsync (80.0 kHz)
(II) intel(0): Modeline "1024x768"x75.1   78.80  1024 1040 1136 1312  768 769 772 800 +hsync +vsync (60.1 kHz)
(II) intel(0): Modeline "1024x768"x60.0   65.00  1024 1048 1184 1344  768 771 777 806 -hsync -vsync (48.4 kHz)
(II) intel(0): Modeline "800x600"x75.0   49.50  800 816 896 1056  600 601 604 625 +hsync +vsync (46.9 kHz)
(II) intel(0): Modeline "800x600"x60.3   40.00  800 840 968 1056  600 601 605 628 +hsync +vsync (37.9 kHz)
(II) intel(0): Modeline "640x480"x75.0   31.50  640 656 720 840  480 481 484 500 -hsync -vsync (37.5 kHz)
(II) intel(0): Modeline "640x480"x60.0   25.20  640 656 752 800  480 490 492 525 -hsync -vsync (31.5 kHz)
(II) intel(0): Modeline "720x400"x70.1   28.32  720 738 846 900  400 412 414 449 -hsync +vsync (31.5 kHz)


Chances are the display is lying about the specifics of its supported modes and these values are slightly off what the display actually takes; Acer has a history of producing devices with atrocious BIOSes and firmwares.

However, 1024x768 and 800x600 (and probably other lower resolutions) work when using the vesa driver as opposed to the intel driver.

This happens with all semi-current versions of the intel driver (tried 2.8.0.901, 2.8.0, 2.7.1), but it used to work ages ago (probably around the time 2.4.x was current; and probably because old versions didn't rely as much on EDID as current ones do).
Comment 1 Michael Fu 2009-08-23 20:21:44 UTC 
need more detailed description of your environment. such as your kernel version  and dmesg. are you using Kernel Modesetting? also would you pls attach a intel_reg_dumper output when the the display resolution doesn't work? thanks.
Comment 2 Bernhard Rosenkraenzer 2009-08-24 15:14:55 UTC 
kernel is 2.6.31-rc6, the problem happens both with kernel modesetting enabled and disabled, dmesg says

[drm] TMDS-8: set mode  17

when switching to 1024x768, and

[drm] TMDS-8: set mode  1a

when switching back to 1920x1200
Comment 3 Bernhard Rosenkraenzer 2009-08-24 15:15:32 UTC 
Created attachment 28889 [details]
intel_reg_dumper output while in 1024x768
Comment 4 Michael Fu 2009-08-24 19:22:38 UTC 
SDVO multiplier for pipe A is wrong...
Comment 5 ykzhao 2009-08-25 01:52:04 UTC 
What Michael said in comment #4 is right. When the system switches to the 1024x768 resolution, the SDVO multiplier should be 2. 

Hi, Bernhard
    Will you please add the modedebug option in xorg.conf and do the following test with the modesetting disabled? (add option "modedebug" "true" under the device section)
   a. switch to the native resolution
   b. switch to lower resolution(1024x768)
   
   After the test, please attach the Xorg.log.

Thanks.
Comment 6 ykzhao 2009-08-25 02:11:14 UTC 
(In reply to comment #2)
> kernel is 2.6.31-rc6, the problem happens both with kernel modesetting enabled
> and disabled, dmesg says
> 
> [drm] TMDS-8: set mode  17
> 
> when switching to 1024x768, and
> 
> [drm] TMDS-8: set mode  1a
> 
> when switching back to 1920x1200
> 
Will you please double check whether it can't work when the kernel modesetting is disabled?

Will you please try the patch in https://bugs.freedesktop.org/show_bug.cgi?id=21417#C16 with modesetting enabled and see whether the issue still exists?

Thanks.
Comment 7 ykzhao 2009-08-30 23:36:18 UTC 
As the box is based on Q35 platform and we have a fix for this platform, this bug will be marked as the duplicate of bug21417.

If the problem still exists after trying the latest Eric's drm-intel-next tree, please reopen it again.

thanks.

*** This bug has been marked as a duplicate of bug 21417 ***

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