Re: Dual Monitor on tumbleweed

On Wed, 2021-12-08 at 18:52 -0300, Christian Schmitz wrote:

On Wednesday 08 December 2021 15:31:58 you wrote:

...

On Wed, Dec 8, 2021, 13:03 Christian Schmitz wrote:

...

Helo everyone: Thanks for all. The working option was:

xrandr --output VGA-0 --auto --primary --output DVI-0 --mode 1024x768 --right-of VGA-0

I add --mode because i dont know why the system try to use a out of specifications resolution on small ( and secondary monitor)

Also --primary because the TDE use the small monitor as primary

The result is that the system start mirrored on boot, when X start for 0 seconds still mirrored and after that switch to the alright screen

.

These days the screen resolution info comes from edit monitor data, as supposed to more/less elaborate guess in the past.

Your vga screen has no way of communicating that data over vga, even if it would support it over hdmi/DP. The same is most likely true for your DVI connected screen. VGA still have DDC detection of monitor model, resolution and H/V data.

That is why X picks some sort of safe options. I think in same way

You probably would have correct resolution, refresh rates, etc. set correctly with modern monitors connected over DP/USB-C/hdmi

-T Thanks you for your answer. I am on Argentine, so the hardware is some old, but working hehehe.

--

By no means I wanted to suggest that people should use the latest and greatest - just wanted to reason about the possibility that the screen maybe unable to share its info. If you install read-edid and then run: sudo get-edid to find if you get any screen info on any I2C buses. If you do see info - decode it and see what the monitors are reporting. It works like this:

sudo get-edid This is read-edid version 3.0.2. Prepare for some fun. Attempting to use i2c interface No EDID on bus 0 No EDID on bus 1 No EDID on bus 2 No EDID on bus 3 No EDID on bus 4 No EDID on bus 5 No EDID on bus 6 No EDID on bus 7 No EDID on bus 9 2 potential busses found: 8 10 Will scan through until the first EDID is found. Pass a bus number as an option to this program to go only for that one. 128-byte EDID successfully retrieved from i2c bus 8 ??????????????-Z??x??TL??&PT??7????p8>@:*5%?? ??AUO ??B133HAN05.A Looks like i2c was successful. Have a good day.

sudo get-edid -b 8 | parse-edid 8 This is read-edid version 3.0.2. Prepare for some fun. Attempting to use i2c interface Only trying 8 as per your request. 128-byte EDID successfully retrieved from i2c bus 8 Looks like i2c was successful. Have a good day. Checksum Correct

Section "Monitor" Identifier "" ModelName "" VendorName "AUO" # Monitor Manufactured week 0 of 2018 # EDID version 1.4 # Digital Display DisplaySize 290 170 Gamma 2.20 Option "DPMS" "false" Modeline "Mode 0" 142.60 1920 1978 2020 2080 1080 1083 1088 1142 -hsync -vsync EndSection

sudo get-edid -b 10 | parse-edid 1 0 This is read-edid version 3.0.2. Prepare for some fun. Attempting to use i2c interface Only trying 10 as per your request. 256-byte EDID successfully retrieved from i2c bus 10 Looks like i2c was successful. Have a good day. Checksum Correct

Section "Monitor" Identifier "DELL U3011" ModelName "DELL U3011" VendorName "DEL" # Monitor Manufactured week 41 of 2012 # EDID version 1.3 # Digital Display DisplaySize 640 400 Gamma 2.20 Option "DPMS" "true" Horizsync 29-94 VertRefresh 49-86 # Maximum pixel clock is 180MHz #Not giving standard mode: 1152x864, 75Hz #Not giving standard mode: 1280x800, 60Hz #Not giving standard mode: 1280x1024, 60Hz #Not giving standard mode: 1920x1200, 60Hz #Not giving standard mode: 1600x1200, 60Hz #Extension block found. Parsing... Modeline "Mode 17" 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync Modeline "Mode 0" 154.00 1920 1968 2000 2080 1200 1203 1209 1235 +hsync -vsync Modeline "Mode 1" 148.500 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync Modeline "Mode 2" 74.250 1920 2008 2052 2200 1080 1082 1087 1125 +hsync +vsync interlace Modeline "Mode 3" 74.250 1280 1390 1420 1650 720 725 730 750 +hsync +vsync Modeline "Mode 4" 27.027 720 736 798 858 480 489 495 525 -hsync -vsync Modeline "Mode 5" 27.027 720 736 798 858 480 489 495 525 -hsync -vsync Modeline "Mode 6" 27.027 1440 1478 1602 1716 480 484 487 525 -hsync -vsync interlace Modeline "Mode 7" 27.000 1440 1464 1590 1728 576 578 581 625 -hsync -vsync interlace Modeline "Mode 8" 25.200 640 656 752 800 480 490 492 525 -hsync -vsync Modeline "Mode 9" 27.027 1440 1478 1602 1716 480 484 487 525 -hsync -vsync interlace Modeline "Mode 10" 27.000 720 732 796 864 576 581 586 625 -hsync -vsync Modeline "Mode 11" 27.000 720 732 796 864 576 581 586 625 -hsync -vsync Modeline "Mode 12" 27.000 1440 1464 1590 1728 576 578 581 625 -hsync -vsync interlace Modeline "Mode 13" 74.250 1280 1720 1760 1980 720 725 730 750 +hsync +vsync Modeline "Mode 14" 74.250 1920 2448 2492 2640 1080 1082 1089 1125 +hsync +vsync interlace Modeline "Mode 15" 148.500 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync Modeline "Mode 16" 74.250 1920 2558 2602 2750 1080 1084 1089 1125 +hsync +vsync Modeline "Mode 18" 74.25 1920 2008 2052 2200 540 542 547 562 +hsync +vsync interlace Modeline "Mode 19" 74.25 1280 1390 1430 1650 720 725 730 750 +hsync +vsync Modeline "Mode 20" 27.00 720 736 798 858 480 489 495 525 -hsync -vsync Option "PreferredMode" "Mode 17" EndSection