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I have problem with scaling.
My HW: Lenovo Thinkpad X220 (intel HD 3000), ThinkPad Mini Dock Plus Series 3, LG 29um65 (21:9, 2560x1080). Windows 7 Pro
On LCD I enabled PBP (Picture By Picture), connect DP and DVI from dock to LCD and in Intel Graphics Control Panel setup custom resolution 1280x1080/60Hz and Scaling = Maintain Display Scaling. One half is OK, on second is "bluish screen with red flickering". Problem is gone, if I change scaling for second Display to Scale Full Screen. But I think, that text on second screen is little blurred.
I try Display Driver 188.8.131.5247 from Lenovo (date 8/11/2014) and last Intel Driver 184.108.40.206.4229 (date 6/5/2015). Same problem.
Is it HW or SW problem?
2x Maintain Display Scaling:
First Maintain Display Scaling, second Scale Full Screen: