Unfortunately, one of the entries in the quirk table (i830_quirks.c) is
incorrect:
++ /* Dell Latitude X1 */
++ { PCI_CHIP_I945_GM, 0x1028, 0x01a3, quirk_ignore_tv },
This should be PCI_CHIP_I915_GM.
Please have a look at bug 134365.
The patch is as follows:
http://gitweb.freedesktop.org/?p=xorg/driver/xf86-video-
intel.git;a=commit;h=cd6f83519c69f72f146fea59afbd6a3542da783a
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TVout is interfering with screen resolution on Intel graphics
https://bugs.launchpad.net/bugs/131646
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