Hmm, the edid and ddc data looks correct, it's odd that it would see
this as a regular 4:3 monitor and then pick a widescreen resolution out
of the blue.
Please attach your current /etc/X11/xorg.conf so we can see if there's
any interfering configuration settings. If not, perhaps this monitor
needs a quirk, in which case we should report this upstream.
(--) PCI:*(3:0:0) ATI Technologies Inc unknown chipset (0x9589) rev 0, Mem @
0xe0000000/28, 0xfdce0000/16, I/O @ 0x7c00/8, BIOS @ 0xfdcc0000/17
(II) PCI: 03:00:0: chip 1002,9589 card 1545,3330 rev 00 class 03,00,00 hdr 80
(II) PCI: 03:00:1: chip 1002,aa08 card 1545,aa08 rev 00 class 04,03,00 hdr 80
II) RADEON(0): ATOM BIOS Rom:
SubsystemVendorID: 0x1545 SubsystemID: 0x3330
IOBaseAddress: 0x7c00
Filename: SV25759.bin
BIOS Bootup Message:
26P256PCIE
(II) RADEON(0): Printing DDC gathered Modelines:
(II) RADEON(0): Modeline "720x350"x0.0 28.32 720 738 846 900 350 388 390
449 +hsync -vsync (31.5 kHz)
(II) RADEON(0): Modeline "800x600"x0.0 40.00 800 840 968 1056 600 601 605
628 +hsync +vsync (37.9 kHz)
(II) RADEON(0): Modeline "640x480"x0.0 31.50 640 656 720 840 480 481 484
500 -hsync -vsync (37.5 kHz)
(II) RADEON(0): Modeline "640x480"x0.0 25.20 640 656 752 800 480 490 492
525 -hsync -vsync (31.5 kHz)
(II) RADEON(0): Modeline "720x400"x0.0 28.32 720 738 846 900 400 412 414
449 -hsync +vsync (31.5 kHz)
(II) RADEON(0): Modeline "1024x768"x0.0 78.80 1024 1040 1136 1312 768 769
772 800 +hsync +vsync (60.1 kHz)
(II) RADEON(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771
777 806 -hsync -vsync (48.4 kHz)
(II) RADEON(0): Modeline "800x600"x0.0 49.50 800 816 896 1056 600 601 604
625 +hsync +vsync (46.9 kHz)
(II) RADEON(0): Modeline "1024x768"x84.9 94.50 1024 1096 1200 1376 768 771
775 809 -hsync +vsync (68.7 kHz)
(II) RADEON(0): Modeline "800x600"x84.9 56.75 800 848 928 1056 600 603 607
633 -hsync +vsync (53.7 kHz)
(II) RADEON(0): Modeline "1280x1024"x59.9 109.00 1280 1368 1496 1712 1024
1027 1034 1063 -hsync +vsync (63.7 kHz)
(II) RADEON(0): Modeline "640x480"x84.6 35.00 640 664 728 816 480 483 487
507 -hsync +vsync (42.9 kHz)
(II) RADEON(0): Max H-Image Size [cm]: horiz.: 28 vert.: 21
(II) RADEON(0): clock: 28.3 MHz Image Size: 267 x 200 mm
(**) RADEON(0): Display dimensions: (280, 210) mm
(**) RADEON(0): DPI set to (152, 145)
(II) RADEON(0): Output DVI-1 using initial mode 1280x768
** Changed in: xorg-server (Ubuntu)
Sourcepackagename: xorg => xorg-server
--
resolution reset on login
https://bugs.launchpad.net/bugs/225508
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