I have nowadays quite old laptop T420 with i5-2540M with integrated graphics Intel HD Graphics 3000. I wonder if this will be sufficient for connecting some sort of low-end monitor suitable for photo editing. Something like 27" IPS up to 2K resolution. I wasn't able to find out any information on intel specs site. I have a DP so it could be possible but I don't know if there is a support for such resolution and also even when there will be support, if my laptop won't burn a hole into my desk when I start work with it :D
EDIT: Resolution of monitors I'm currently looking for is 2560x1440 (QHD?)
21 Answer
The maximum resolution of the Intel HD Graphics 3000 as indicated in many sources is 2500x1600 (example), although you might need the DisplayPort to achieve it. The real maximum also depends on your monitor.
This maximal resolution is also possible for HDMI although you may need to lower the refresh rate, which is only a problem when gaming.
A test case is found in the article
How to run a WQHD monitor at 2,560 x 1,440 via HDMI on an Intel HD3000, HD4000.